1、設定UILabel行間距

NSMutableAttributedString* attrString = [[NSMutableAttributedString  alloc] initWithString:label.text];    NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];    [style setLineSpacing:20];    [attrString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, label.text.length)];    label.attributedText = attrString;

// 或者使用xib,看下gif圖

Untitled.gif

2、當使用-performSelector:withObject:withObject:afterDelay:方法時,需要傳入多引數問題

// 方法一、// 把引數放進一個數組/字典,直接把陣列/字典當成一個引數傳過去,具體方法實現的地方再解析這個陣列/字典NSArray * array =     [NSArray arrayWithObjects: @"first", @"second", nil];[self performSelector:@selector(fooFirstInput:) withObject: array afterDelay:15.0];// 方法二、// 使用NSInvocationSEL aSelector = NSSelectorFromString(@"doSoming:argument2:");    NSInteger argument1 = 10;    NSString *argument2 = @"argument2";    if([self respondsToSelector:aSelector]) {        NSInvocation *inv = [NSInvocation invocationWithMethodSignature:[self methodSignatureForSelector:aSelector]];        [inv setSelector:aSelector];        [inv setTarget:self];        [inv setArgument:&;(argument1) atIndex:2];        [inv setArgument:&;(argument2) atIndex:3];        [inv performSelector:@selector(invoke) withObject:nil afterDelay:15.0];    }

3、UILabel顯示不同顏色字型

NSMutableAttributedString * string = [[NSMutableAttributedString alloc] initWithString:label.text];[string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0,5)];[string addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(5,6)];[string addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(11,5)];label.attributedText = string;

4、比較兩個CGRect/CGSize/CGPoint是否相等

if (CGRectEqualToRect(rect1, rect2)) { // 兩個區域相等        // do some    }    if (CGPointEqualToPoint(point1, point2)) { // 兩個點相等        // do some    }    if (CGSizeEqualToSize(size1, size2)) { // 兩個size相等        // do some    }

5、比較兩個NSDate相差多少小時

 NSDate* date1 = someDate; NSDate* date2 = someOtherDate; NSTimeInterval distanceBetweenDates = [date1 timeIntervalSinceDate:date2]; double secondsInAnHour = 3600;// 除以3600是把秒化成小時,除以60得到結果為相差的分鐘數 NSInteger hoursBetweenDates = distanceBetweenDates / secondsInAnHour;

6、每個cell之間增加間距

// 方法一,每個分割槽只顯示一行cell,分割槽頭當作你想要的間距(注意,從資料來源陣列中取值的時候需要用indexPath.section而不是indexPath.row)- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return yourArry.count;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return 1;}-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{    return cellSpacingHeight;}// 方法二,在cell的contentView上加個稍微低一點的view,cell上原本的內容放在你的view上,而不是contentView上,這樣能偽造出一個間距來。// 方法三,自定義cell,重寫setFrame:方法- (void)setFrame:(CGRect)frame{    frame.size.height -= 20;    [super setFrame:frame];}

7、播放一張張連續的圖片

// 加入現在有三張圖片分別為animate_1、animate_2、animate_3// 方法一    imageView.animationImages = @[[UIImage imageNamed:@"animate_1"], [UIImage imageNamed:@"animate_2"], [UIImage imageNamed:@"animate_3"]];imageView.animationDuration = 1.0;// 方法二    imageView.image = [UIImage animatedImageNamed:@"animate_" duration:1.0];// 方法二解釋下,這個方法會載入animate_為字首的,後邊0-1024,也就是animate_0、animate_1一直到animate_1024

8、載入gif圖片

推薦使用這個框架 FLAnimatedImage

9、防止離屏渲染為image新增圓角

// image分類- (UIImage *)circleImage{// NO代表透明UIGraphicsBeginImageContextWithOptions(self.size, NO, 1);// 獲得上下文CGContextRef ctx = UIGraphicsGetCurrentContext();// 新增一個圓CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);// 方形變圓形CGContextAddEllipseInRect(ctx, rect);// 裁剪CGContextClip(ctx);// 將圖片畫上去[self drawInRect:rect];UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image;}

10、檢視系統所有字型

// 列印字型for (id familyName in [UIFont familyNames]) {    NSLog(@"%@", familyName);    for (id fontName in [UIFont fontNamesForFamilyName:familyName]) NSLog(@"  %@", fontName);}// 也可以進入這個網址檢視 http://iosfonts.com/

11、獲取隨機數

NSInteger i = arc4random();

12、獲取隨機數小數(0-1之間)

#define ARC4RANDOM_MAX      0x100000000double val = ((double)arc4random() / ARC4RANDOM_MAX);

13、AVPlayer視訊播放完成的通知監聽

[[NSNotificationCenter defaultCenter]       addObserver:self      selector:@selector(videoPlayEnd)      name:AVPlayerItemDidPlayToEndTimeNotification       object:nil];

14、判斷兩個rect是否有交叉

 if (CGRectIntersectsRect(rect1, rect2)) {}

15、判斷一個字串是否為數字

NSCharacterSet *notDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];    if ([str rangeOfCharacterFromSet:notDigits].location == NSNotFound)    {      // 是數字    } else    {      // 不是數字    }

16、將一個view儲存為pdf格式

- (void)createPDFfromUIView:(UIView*)aView saveToDocumentsWithFileName:(NSString*)aFilename{    NSMutableData *pdfData = [NSMutableData data];    UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);    UIGraphicsBeginPDFPage();    CGContextRef pdfContext = UIGraphicsGetCurrentContext();    [aView.layer renderInContext:pdfContext];    UIGraphicsEndPDFContext();    NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);    NSString* documentDirectory = [documentDirectories objectAtIndex:0];    NSString* documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];    [pdfData writeToFile:documentDirectoryFilename atomically:YES];    NSLog(@"documentDirectoryFileName: %@",documentDirectoryFilename);}

17、讓一個view在父檢視中心

child.center = [parent convertPoint:parent.center fromView:parent.superview];

18、獲取當前導航控制器下前一個控制器

- (UIViewController *)backViewController{    NSInteger myIndex = [self.navigationController.viewControllers indexOfObject:self];    if ( myIndex != 0 &;&; myIndex != NSNotFound ) {        return [self.navigationController.viewControllers objectAtIndex:myIndex-1];    } else {        return nil;    }}

19、儲存UIImage到本地

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Image.png"];[UIImagePNGRepresentation(image) writeToFile:filePath atomically:YES];

20、鍵盤上方增加工具欄

UIToolbar *keyboardDoneButtonView = [[UIToolbar alloc] init];[keyboardDoneButtonView sizeToFit];UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done"                                                               style:UIBarButtonItemStyleBordered target:self                                                              action:@selector(doneClicked:)];[keyboardDoneButtonView setItems:[NSArray arrayWithObjects:doneButton, nil]];txtField.inputAccessoryView = keyboardDoneButtonView;

21、copy一個view

因為UIView沒有實現copy協議,因此找不到copyWithZone方法,使用copy的時候導致崩潰

但是我們可以通過歸檔再解檔實現copy,這相當於對檢視進行了一次深拷貝,程式碼如下

id copyOfView = [NSKeyedUnarchiver unarchiveObjectWithData:[NSKeyedArchiver archivedDataWithRootObject:originalView]];

22、在image上繪製文字並生成新的image

UIFont *font = [UIFont boldSystemFontOfSize:12];    UIGraphicsBeginImageContext(image.size);    [image drawInRect:CGRectMake(0,0,image.size.width,image.size.height)];    CGRect rect = CGRectMake(point.x, point.y, image.size.width, image.size.height);    [[UIColor whiteColor] set];    [text drawInRect:CGRectIntegral(rect) withFont:font];     UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();

23、判斷一個view是否為另一個view的子檢視

// 如果myView是self.view本身,也會返回yesBOOL isSubView = [myView isDescendantOfView:self.view];

24、判斷一個字串是否包含另一個字串

// 方法一、這種方法只適用於iOS8之後,如果是配iOS8之前用方法二if ([str containsString:otherStr]) NSLog(@"包含");// 方法二NSRange range = [str rangeOfString:otherStr];if (range.location != NSNotFound) NSLog(@"包含");

25、UICollectionView自動滾動到某行

// 重寫viewDidLayoutSubviews方法-(void)viewDidLayoutSubviews {   [super viewDidLayoutSubviews];   [self.collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionCenteredVertically animated:NO];}

26、修改系統UIAlertController

// 但是據說這種方法會被App Store拒絕(慎用!)UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];    NSMutableAttributedString *hogan = [[NSMutableAttributedString alloc] initWithString:@"我是一個大文字"];    [hogan addAttribute:NSFontAttributeName                  value:[UIFont systemFontOfSize:30]                  range:NSMakeRange(4, 1)];    [hogan addAttribute:NSForegroundColorAttributeName                  value:[UIColor redColor]                  range:NSMakeRange(4, 1)];    [alertVC setValue:hogan forKey:@"attributedTitle"];    UIAlertAction *button = [UIAlertAction actionWithTitle:@"Label text" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){ }];    UIImage *accessoryImage = [UIImage imageNamed:@"1"];    [button setValue:accessoryImage forKey:@"image"];    [alertVC addAction:button];    [self presentViewController:alertVC animated:YES completion:nil];

27、判斷某一行的cell是否已經顯示

CGRect cellRect = [tableView rectForRowAtIndexPath:indexPath];BOOL completelyVisible = CGRectContainsRect(tableView.bounds, cellRect);

28、讓導航控制器pop回指定的控制器

NSMutableArray *allViewControllers = [NSMutableArray arrayWithArray:[self.navigationController viewControllers]];for (UIViewController *aViewController in allViewControllers) {    if ([aViewController isKindOfClass:[RequiredViewController class]]) {        [self.navigationController popToViewController:aViewController animated:NO];    }}

29、動畫修改label上的文字

// 方法一CATransition *animation = [CATransition animation];    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];    animation.type = kCATransitionFade;    animation.duration = 0.75;    [self.label.layer addAnimation:animation forKey:@"kCATransitionFade"];    self.label.text = @"New";// 方法二[UIView transitionWithView:self.label                      duration:0.25f                       options:UIViewAnimationOptionTransitionCrossDissolve                    animations:^{                        self.label.text = @"Well done!";                    } completion:nil];// 方法三[UIView animateWithDuration:1.0                     animations:^{                         self.label.alpha = 0.0f;                         self.label.text = @"newText";                         self.label.alpha = 1.0f;                     }];

30、判斷字典中是否包含某個key值

if ([dic objectForKey:@"yourKey"]) {    NSLog(@"有這個值");} else {    NSLog(@"沒有這個值");}

31、獲取螢幕方向

UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;if(orientation == 0) //Default orientation     //預設else if(orientation == UIInterfaceOrientationPortrait)    //豎屏else if(orientation == UIInterfaceOrientationLandscapeLeft)    // 左橫屏else if(orientation == UIInterfaceOrientationLandscapeRight)    //右橫屏

32、設定UIImage的透明度

// 方法一、新增UIImage分類- (UIImage *)imageByApplyingAlpha:(CGFloat) alpha {    UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);    CGContextRef ctx = UIGraphicsGetCurrentContext();    CGRect area = CGRectMake(0, 0, self.size.width, self.size.height);    CGContextScaleCTM(ctx, 1, -1);    CGContextTranslateCTM(ctx, 0, -area.size.height);    CGContextSetBlendMode(ctx, kCGBlendModeMultiply);    CGContextSetAlpha(ctx, alpha);    CGContextDrawImage(ctx, area, self.CGImage);    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return newImage;}// 方法二、如果沒有奇葩需求,乾脆用UIImageView設定透明度UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageWithName:@"yourImage"]];imageView.alpha = 0.5;

33、Attempt to mutate immutable object with insertString:atIndex:

這個錯是因為你拿字串呼叫insertString:atIndex:方法的時候,呼叫物件不是NSMutableString,應該先轉成這個型別再呼叫

34、UIWebView新增單擊手勢不響應

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(webViewClick)];        tap.delegate = self;        [_webView addGestureRecognizer:tap];// 因為webView本身有一個單擊手勢,所以再新增會造成手勢衝突,從而不響應。需要繫結手勢代理,並實現下邊的代理方法- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{    return YES;}

35、獲取手機RAM容量

// 需要匯入#importmach_port_t host_port;    mach_msg_type_number_t host_size;    vm_size_t pagesize;    host_port = mach_host_self();    host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);    host_page_size(host_port, &;pagesize);    vm_statistics_data_t vm_stat;    if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&;vm_stat, &;host_size) != KERN_SUCCESS) {        NSLog(@"Failed to fetch vm statistics");    }    /* Stats in bytes */    natural_t mem_used = (vm_stat.active_count +                          vm_stat.inactive_count +                          vm_stat.wire_count) * pagesize;    natural_t mem_free = vm_stat.free_count * pagesize;    natural_t mem_total = mem_used + mem_free;    NSLog(@"已用: %u 可用: %u 總共: %u", mem_used, mem_free, mem_total);

36、地圖上兩個點之間的實際距離

// 需要匯入#importCLLocation *locA = [[CLLocation alloc] initWithLatitude:34 longitude:113];    CLLocation *locB = [[CLLocation alloc] initWithLatitude:31.05 longitude:121.76];// CLLocationDistance求出的單位為米    CLLocationDistance distance = [locA distanceFromLocation:locB];

37、在應用中開啟設定的某個介面

// 開啟設定->通用[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=General"]];// 以下是設定其他介面prefs:root=General&;path=Aboutprefs:root=General&;path=ACCESSIBILITYprefs:root=AIRPLANE_MODEprefs:root=General&;path=AUTOLOCKprefs:root=General&;path=USAGE/CELLULAR_USAGEprefs:root=Brightnessprefs:root=Bluetoothprefs:root=General&;path=DATE_AND_TIMEprefs:root=FACETIMEprefs:root=Generalprefs:root=General&;path=Keyboardprefs:root=CASTLEprefs:root=CASTLE&;path=STORAGE_AND_BACKUPprefs:root=General&;path=INTERNATIONALprefs:root=LOCATION_SERVICESprefs:root=ACCOUNT_SETTINGSprefs:root=MUSICprefs:root=MUSIC&;path=EQprefs:root=MUSIC&;path=VolumeLimitprefs:root=General&;path=Networkprefs:root=NIKE_PLUS_IPODprefs:root=NOTESprefs:root=NOTIFICATIONS_IDprefs:root=Phoneprefs:root=Photosprefs:root=General&;path=ManagedConfigurationListprefs:root=General&;path=Resetprefs:root=Sounds&;path=Ringtoneprefs:root=Safariprefs:root=General&;path=Assistantprefs:root=Soundsprefs:root=General&;path=SOFTWARE_UPDATE_LINKprefs:root=STOREprefs:root=TWITTERprefs:root=FACEBOOKprefs:root=General&;path=USAGE prefs:root=VIDEOprefs:root=General&;path=Network/VPNprefs:root=Wallpaperprefs:root=WIFIprefs:root=INTERNET_TETHERINGprefs:root=Phone&;path=Blockedprefs:root=DO_NOT_DISTURB

38、在UITextView中顯示html文字

    UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(20, 30, 100, 199)];    textView.backgroundColor = [UIColor redColor];    [self.view addSubview:textView];    NSString *htmlString = @"";    NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData: [htmlString dataUsingEncoding:NSUnicodeStringEncoding] options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes: nil error: nil];    textView.attributedText = attributedString;

39、監聽scrollView是否滾動到了頂部/底部

-(void)scrollViewDidScroll: (UIScrollView*)scrollView{    float scrollViewHeight = scrollView.frame.size.height;    float scrollContentSizeHeight = scrollView.contentSize.height;    float scrollOffset = scrollView.contentOffset.y;    if (scrollOffset == 0)    {        // 滾動到了頂部    }    else if (scrollOffset + scrollViewHeight == scrollContentSizeHeight)    {        // 滾動到了底部    }}

40、UISlider增量/減量為固定值(假如為5)

- (void)setupSlider{    UISlider *slider = [[UISlider alloc] init];    [self.view addSubview:slider];    [slider addTarget:self action:@selector(sliderAction:) forControlEvents:UIControlEventValueChanged];    slider.maximumValue = 100;    slider.minimumValue = 0;    slider.frame = CGRectMake(200, 20, 100, 30);}- (void)sliderAction:(UISlider *)slider{    [slider setValue:((int)((slider.value + 2.5) / 5) * 5) animated:NO];}

41、選中textField或者textView所有文字(我這裡以textView為例)

[self.textView setSelectedTextRange:[self.textView textRangeFromPosition:self.textView.beginningOfDocument toPosition:self.textView.endOfDocument]]

42、從導航控制器中刪除某個控制器

// 方法一、知道這個控制器所處的導航控制器下標NSMutableArray *navigationArray = [[NSMutableArray alloc] initWithArray: self.navigationController.viewControllers];[navigationArray removeObjectAtIndex: 2]; self.navigationController.viewControllers = navigationArray;// 方法二、知道具體是哪個控制器NSArray* tempVCA = [self.navigationController viewControllers];for(UIViewController *tempVC in tempVCA){    if([tempVC isKindOfClass:[urViewControllerClass class]])    {        [tempVC removeFromParentViewController];    }}

43、隱藏UITextView/UITextField游標

textField.tintColor = [UIColor clearColor];

44、當UITextView/UITextField中沒有文字時,禁用回車鍵

textField.enablesReturnKeyAutomatically = YES;

45、字串encode編碼(編碼url字串不成功的問題)

// 我們一般用這個方法處理stringByAddingPercentEscapesUsingEncoding但是這個方法好想不會處理/和&;這種特殊符號,這種情況就需要用下邊這個方法處理@implementation NSString (NSString_Extended)- (NSString *)urlencode {    NSMutableString *output = [NSMutableString string];    const unsigned char *source = (const unsigned char *)[self UTF8String];    int sourceLen = strlen((const char *)source);    for (int i = 0; i < sourceLen; ++i) {        const unsigned char thisChar = source[i];        if (thisChar == ' '){            [output appendString:@"+"];        } else if (thisChar == '.' || thisChar == '-' || thisChar == '_' || thisChar == '~' ||                    (thisChar >= 'a' &;&; thisChar = 'A' &;&; thisChar = '0' &;&; thisChar <= '9')) {            [output appendFormat:@"%c", thisChar];        } else {            [output appendFormat:@"%%X", thisChar];        }    }    return output;}

46、計算UILabel上某段文字的frame

@implementation UILabel (TextRect)- (CGRect)boundingRectForCharacterRange:(NSRange)range{    NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:[self attributedText]];    NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];    [textStorage addLayoutManager:layoutManager];    NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:[self bounds].size];    textContainer.lineFragmentPadding = 0;    [layoutManager addTextContainer:textContainer];    NSRange glyphRange;    [layoutManager characterRangeForGlyphRange:range actualGlyphRange:≷yphRange];    return [layoutManager boundingRectForGlyphRange:glyphRange inTextContainer:textContainer];}

47、獲取隨機UUID

NSString *result;    if([[[UIDevice currentDevice] systemVersion] floatValue] > 6.0)    {       result = [[NSUUID UUID] UUIDString];    }    else    {        CFUUIDRef uuidRef = CFUUIDCreate(NULL);        CFStringRef uuid = CFUUIDCreateString(NULL, uuidRef);        CFRelease(uuidRef);        result = (__bridge_transfer NSString *)uuid;    }

48、仿蘋果抖動動畫

#define RADIANS(degrees) (((degrees) * M_PI) / 180.0)- (void)startAnimate {    view.transform = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(-5));    [UIView animateWithDuration:0.25 delay:0.0 options:(UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse) animations:^ {                         view.transform = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(5));                     } completion:nil];}- (void)stopAnimate {    [UIView animateWithDuration:0.25 delay:0.0 options:(UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveLinear) animations:^ {                         view.transform = CGAffineTransformIdentity;                     } completion:nil];}

49、修改UISearBar內部背景顏色

UITextField *textField = [_searchBar valueForKey:@"_searchField"];textField.backgroundColor = [UIColor redColor];

50、UITextView滾動到頂部

    // 方法一    [self.textView scrollRangeToVisible:NSMakeRange(0, 0)];    // 方法二    [self.textView setContentOffset:CGPointZero animated:YES];

51、通知監聽APP生命週期

UIApplicationDidEnterBackgroundNotification 應用程式進入後臺UIApplicationWillEnterForegroundNotification 應用程式將要進入前臺UIApplicationDidFinishLaunchingNotification 應用程式完成啟動UIApplicationDidFinishLaunchingNotification 應用程式由掛起變的活躍UIApplicationWillResignActiveNotification 應用程式掛起(有電話進來或者鎖屏)UIApplicationDidReceiveMemoryWarningNotification 應用程式收到記憶體警告UIApplicationDidReceiveMemoryWarningNotification 應用程式終止(後臺殺死、手機關機等)UIApplicationSignificantTimeChangeNotification 當有重大時間改變(凌晨0點,裝置時間被修改,時區改變等)UIApplicationWillChangeStatusBarOrientationNotification 裝置方向將要改變UIApplicationDidChangeStatusBarOrientationNotification 裝置方向改變UIApplicationWillChangeStatusBarFrameNotification 裝置狀態列frame將要改變UIApplicationDidChangeStatusBarFrameNotification 裝置狀態列frame改變UIApplicationBackgroundRefreshStatusDidChangeNotification 應用程式在後臺下載內容的狀態發生變化UIApplicationProtectedDataWillBecomeUnavailable 本地受保護的檔案被鎖定,無法訪問UIApplicationProtectedDataWillBecomeUnavailable 本地受保護的檔案可用了

52、觸控事件型別

UIControlEventTouchCancel 取消控制元件當前觸發的事件UIControlEventTouchDown 點按下去的事件UIControlEventTouchDownRepeat 重複的觸動事件UIControlEventTouchDragEnter 手指被拖動到控制元件的邊界的事件UIControlEventTouchDragExit 一個手指從控制元件內拖到外界的事件UIControlEventTouchDragInside 手指在控制元件的邊界內拖動的事件UIControlEventTouchDragOutside 手指在控制元件邊界之外被拖動的事件UIControlEventTouchUpInside 手指處於控制範圍內的觸控事件UIControlEventTouchUpOutside 手指超出控制範圍的控制中的觸控事件

53、UITextField文字周圍增加邊距

    // 子類化UITextField,增加insert屬性@interface WZBTextField : [email protected] (nonatomic, assign) UIEdgeInsets insets;@end// 在.m檔案重寫下列方法- (CGRect)textRectForBounds:(CGRect)bounds {    CGRect paddedRect = UIEdgeInsetsInsetRect(bounds, self.insets);    if (self.rightViewMode == UITextFieldViewModeAlways || self.rightViewMode == UITextFieldViewModeUnlessEditing) {        return [self adjustRectWithWidthRightView:paddedRect];    }    return paddedRect;}- (CGRect)placeholderRectForBounds:(CGRect)bounds {    CGRect paddedRect = UIEdgeInsetsInsetRect(bounds, self.insets);    if (self.rightViewMode == UITextFieldViewModeAlways || self.rightViewMode == UITextFieldViewModeUnlessEditing) {        return [self adjustRectWithWidthRightView:paddedRect];    }    return paddedRect;}- (CGRect)editingRectForBounds:(CGRect)bounds {    CGRect paddedRect = UIEdgeInsetsInsetRect(bounds, self.insets);    if (self.rightViewMode == UITextFieldViewModeAlways || self.rightViewMode == UITextFieldViewModeWhileEditing) {        return [self adjustRectWithWidthRightView:paddedRect];    }    return paddedRect;}- (CGRect)adjustRectWithWidthRightView:(CGRect)bounds {    CGRect paddedRect = bounds;    paddedRect.size.width -= CGRectGetWidth(self.rightView.frame);    return paddedRect;}

54、監聽UISlider拖動狀態

// 新增事件[slider addTarget:self action:@selector(sliderValurChanged:forEvent:) forControlEvents:UIControlEventValueChanged];// 實現方法- (void)sliderValurChanged:(UISlider*)slider forEvent:(UIEvent*)event {    UITouch *touchEvent = [[event allTouches] anyObject];    switch (touchEvent.phase) {        case UITouchPhaseBegan:            NSLog(@"開始拖動");            break;        case UITouchPhaseMoved:            NSLog(@"正在拖動");            break;        case UITouchPhaseEnded:            NSLog(@"結束拖動");            break;        default:            break;    }}

55、設定UITextField游標位置

// textField需要設定的textField,index要設定的游標位置- (void)cursorLocation:(UITextField *)textField index:(NSInteger)index{    NSRange range = NSMakeRange(index, 0);    UITextPosition *start = [textField positionFromPosition:[textField beginningOfDocument] offset:range.location];    UITextPosition *end = [textField positionFromPosition:start offset:range.length];    [textField setSelectedTextRange:[textField textRangeFromPosition:start toPosition:end]];}

56、去除webView底部黑色

    [webView setBackgroundColor:[UIColor clearColor]];    [webView setOpaque:NO];    for (UIView *v1 in [webView subviews])    {        if ([v1 isKindOfClass:[UIScrollView class]])        {            for (UIView *v2 in v1.subviews)            {                if ([v2 isKindOfClass:[UIImageView class]])                {                    v2.hidden = YES;                }            }        }    }

57、獲取collectionViewCell在螢幕中的frame

UICollectionViewLayoutAttributes *attributes = [collectionView layoutAttributesForItemAtIndexPath:indexPath];CGRect cellRect = attributes.frame;CGRect cellFrameInSuperview = [collectionView convertRect:cellRect toView:[cv superview]];

58、比較兩個UIImage是否相等

- (BOOL)image:(UIImage *)image1 isEqualTo:(UIImage *)image2{    NSData *data1 = UIImagePNGRepresentation(image1);    NSData *data2 = UIImagePNGRepresentation(image2);    return [data1 isEqual:data2];}

59、解決當UIScrollView上有UIButton的時候,觸控到button滑動不了的問題

// 子類化UIScrollView,並重寫以下方法- (instancetype)initWithFrame:(CGRect)frame {    if (self = [super initWithFrame:frame]) {        self.delaysContentTouches = NO;    }    return self;}- (BOOL)touchesShouldCancelInContentView:(UIView *)view {    if ([view isKindOfClass:UIButton.class]) {        return YES;    }    return [super touchesShouldCancelInContentView:view];}

60、UITextView中的文字新增陰影效果

- (void)setTextLayer:(UITextView *)textView color:(UIColor *)color{    CALayer *textLayer = ((CALayer *)[textView.layer.sublayers objectAtIndex:0]);    textLayer.shadowColor = color.CGColor;    textLayer.shadowOffset = CGSizeMake(0.0f, 1.0f);    textLayer.shadowOpacity = 1.0f;    textLayer.shadowRadius = 1.0f;}

61、MD5加密

+ (NSString *)md5:(NSString *)str{    const char *concat_str = [str UTF8String];    unsigned char result[CC_MD5_DIGEST_LENGTH];    CC_MD5(concat_str, (unsigned int)strlen(concat_str), result);    NSMutableString *hash = [NSMutableString string];    for (int i =0; i<16; i++){        [hash appendFormat:@"X", result[i]];    }    return [hash uppercaseString];}

62、base64加密

@interface NSData (Base64)/** *  @brief  字串base64後轉data */+ (NSData *)dataWithBase64EncodedString:(NSString *)string{    if (![string length]) return nil;    NSData *decoded = nil;#if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0    if (![NSData instancesRespondToSelector:@selector(initWithBase64EncodedString:options:)])    {#pragma clang diagnostic push#pragma clang diagnostic ignored "-Wdeprecated-declarations"        decoded = [[self alloc] initWithBase64Encoding:[string stringByReplacingOccurrencesOfString:@"[^A-Za-z0-9+/=]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [string length])]];#pragma clang diagnostic pop    }    else#endif    {        decoded = [[self alloc] initWithBase64EncodedString:string options:NSDataBase64DecodingIgnoreUnknownCharacters];    }    return [decoded length]? decoded: nil;}/** *  @brief  NSData轉string *  @param wrapWidth 換行長度  76  64 */- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth{    if (![self length]) return nil;    NSString *encoded = nil;#if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0    if (![NSData instancesRespondToSelector:@selector(base64EncodedStringWithOptions:)])    {#pragma clang diagnostic push#pragma clang diagnostic ignored "-Wdeprecated-declarations"        encoded = [self base64Encoding];#pragma clang diagnostic pop    }    else#endif    {        switch (wrapWidth)        {            case 64:            {                return [self base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];            }            case 76:            {                return [self base64EncodedStringWithOptions:NSDataBase64Encoding76CharacterLineLength];            }            default:            {                encoded = [self base64EncodedStringWithOptions:(NSDataBase64EncodingOptions)0];            }        }    }    if (!wrapWidth || wrapWidth >= [encoded length])    {        return encoded;    }    wrapWidth = (wrapWidth / 4) * 4;    NSMutableString *result = [NSMutableString string];    for (NSUInteger i = 0; i < [encoded length]; i+= wrapWidth)    {        if (i + wrapWidth >= [encoded length])        {            [result appendString:[encoded substringFromIndex:i]];            break;        }        [result appendString:[encoded substringWithRange:NSMakeRange(i, wrapWidth)]];        [result appendString:@"/r/n"];    }    return result;}/** *  @brief  NSData轉string 換行長度預設64 */- (NSString *)base64EncodedString{    return [self base64EncodedStringWithWrapWidth:0];}

63、AES加密

#[email protected] NSData (AES)/** *  利用AES加密資料 */- (NSData*)encryptedWithAESUsingKey:(NSString*)key andIV:(NSData*)iv {    NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];    size_t dataMoved;    NSMutableData *encryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSizeAES128];    CCCryptorStatus status = CCCrypt(kCCEncrypt,kCCAlgorithmAES128,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,encryptedData.mutableBytes, encryptedData.length,&;dataMoved);    if (status == kCCSuccess) {        encryptedData.length = dataMoved;        return encryptedData;    }    return nil;}/** *  @brief  利用AES解密據 */- (NSData*)decryptedWithAESUsingKey:(NSString*)key andIV:(NSData*)iv {    NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];    size_t dataMoved;    NSMutableData *decryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSizeAES128];    CCCryptorStatus result = CCCrypt(kCCDecrypt,kCCAlgorithmAES128,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,decryptedData.mutableBytes, decryptedData.length,&;dataMoved);    if (result == kCCSuccess) {        decryptedData.length = dataMoved;        return decryptedData;    }    return nil;}

64、3DES加密

#[email protected] NSData (3DES)/** *  利用3DES加密資料 */- (NSData*)encryptedWith3DESUsingKey:(NSString*)key andIV:(NSData*)iv {    NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];    size_t dataMoved;    NSMutableData *encryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSize3DES];    CCCryptorStatus result = CCCrypt(kCCEncrypt,kCCAlgorithm3DES,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,encryptedData.mutableBytes,encryptedData.length,&;dataMoved);    if (result == kCCSuccess) {        encryptedData.length = dataMoved;        return encryptedData;    }    return nil;}/** *  @brief   利用3DES解密資料 */- (NSData*)decryptedWith3DESUsingKey:(NSString*)key andIV:(NSData*)iv {    NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];    size_t dataMoved;    NSMutableData *decryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSize3DES];    CCCryptorStatus result = CCCrypt(kCCDecrypt,kCCAlgorithm3DES,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,decryptedData.mutableBytes,decryptedData.length,&;dataMoved);    if (result == kCCSuccess) {        decryptedData.length = dataMoved;        return decryptedData;    }    return nil;}

65、單個頁面多個網路請求的情況,需要監聽所有網路請求結束後重新整理UI

dispatch_group_t group = dispatch_group_create();    dispatch_queue_t serialQueue = dispatch_queue_create("com.wzb.test.www", DISPATCH_QUEUE_SERIAL);    dispatch_group_enter(group);    dispatch_group_async(group, serialQueue, ^{        // 網路請求一        [WebClick getDataSuccess:^(ResponseModel *model) {            dispatch_group_leave(group);        } failure:^(NSString *err) {            dispatch_group_leave(group);        }];    });    dispatch_group_enter(group);    dispatch_group_async(group, serialQueue, ^{        // 網路請求二        [WebClick getDataSuccess:getBigTypeRM onSuccess:^(ResponseModel *model) {            dispatch_group_leave(group);        }                                  failure:^(NSString *errorString) {            dispatch_group_leave(group);        }];    });    dispatch_group_enter(group);    dispatch_group_async(group, serialQueue, ^{        // 網路請求三        [WebClick getDataSuccess:^{            dispatch_group_leave(group);        } failure:^(NSString *errorString) {            dispatch_group_leave(group);        }];    });    // 所有網路請求結束後會來到這個方法    dispatch_group_notify(group, serialQueue, ^{        dispatch_async(dispatch_get_global_queue(0, 0), ^{            dispatch_async(dispatch_get_main_queue(), ^{                // 重新整理UI            });        });    });

66、解決openUrl延時問題

// 方法一dispatch_async(dispatch_get_main_queue(), ^{    UIApplication *application = [UIApplication sharedApplication];    if ([application respondsToSelector:@selector(openURL:options:completionHandler:)]) {        [application openURL:URL options:@{}           completionHandler:nil];    } else {        [application openURL:URL];    }    });// 方法二[self performSelector:@selector(redirectToURL:) withObject:url afterDelay:0.1];- (void) redirectToURL{UIApplication *application = [UIApplication sharedApplication];    if ([application respondsToSelector:@selector(openURL:options:completionHandler:)]) {        [application openURL:URL options:@{}           completionHandler:nil];    } else {        [application openURL:URL];    }}

67、頁面跳轉實現翻轉動畫

// modal方式    TestViewController *vc = [[TestViewController alloc] init];    vc.view.backgroundColor = [UIColor redColor];    vc.modalTransitionStyle = UIModalTransitionStyleCoverVertical;    [self presentViewController:vc animated:YES completion:nil];// push方式    TestViewController *vc = [[TestViewController alloc] init];    vc.view.backgroundColor = [UIColor redColor];    [UIView beginAnimations:@"View Flip" context:nil];    [UIView setAnimationDuration:0.80];    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.navigationController.view cache:NO];    [self.navigationController pushViewController:vc animated:YES];    [UIView commitAnimations];

68、tableView實現無限滾動

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{    CGFloat actualPosition = scrollView.contentOffset.y;    CGFloat contentHeight = scrollView.contentSize.height - scrollView.frame.size.height;    if (actualPosition >= contentHeight) {        [self.dataArr addObjectsFromArray:self.dataArr];        [self.tableView reloadData];    }}

69、程式碼方式調整螢幕亮度

// brightness屬性值在0-1之間,0代表最小亮度,1代表最大亮度[[UIScreen mainScreen] setBrightness:0.5];

70、獲取當前應用CUP用量

float cpu_usage(){    kern_return_t kr;    task_info_data_t tinfo;    mach_msg_type_number_t task_info_count;    task_info_count = TASK_INFO_MAX;    kr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)tinfo, &;task_info_count);    if (kr != KERN_SUCCESS) {        return -1;    }    task_basic_info_t      basic_info;    thread_array_t         thread_list;    mach_msg_type_number_t thread_count;    thread_info_data_t     thinfo;    mach_msg_type_number_t thread_info_count;    thread_basic_info_t basic_info_th;    uint32_t stat_thread = 0; // Mach threads    basic_info = (task_basic_info_t)tinfo;    // get threads in the task