UILabel UIFont

//UILabel垂直居上對齊:

[label sizeToFit];

//設定文字過長時的顯示格式

label.lineBreakMode = UILineBreakModeWordWrap;
typedefenum {
    UILineBreakModeWordWrap =0,
    UILineBreakModeClip,//截去多餘部分  
    UILineBreakModeHeadTruncation, //截去頭部
    UILineBreakModeTailTruncation,//截去尾部 
    UILineBreakModeMiddleTruncation,//截去中間
 

} UILineBreakMode;

//設定label的行數，這個可以根據上節的UITextView自適應高度

label.numberOfLines = 2;
label.lineBreakMode = UILineBreakModeWordWrap;

//字型相關屬性設定

//設定文字對齊位置，居左，居中，居右 
label.textAlignment =  UITextAlignmentCenter;
//設定顯示文字 
label.text = @ "123" ;
//設定文字顏色，可以有多種顏色可以選擇
label.textColor = [UIColor whiteColor];
//設定背景顏色
 

label.backgroundColor = [UIColor blackColor];
//設定字型:粗體，正常的是 SystemFontOfSize，呼叫系統的字型配置 
label.font = [UIFont boldSystemFontOfSize:20];
label.font = [UIFont fontWithName:@ "Arial Rounded MT Bold"  size:(36.0)];
//[UIFont fontWithName:@ "Arial" size:14.0]]; //非加粗

//設定文字是否高亮和高亮時的顏色
scoreLabel.highlighted = YES
 
; 
scoreLabel.highlightedTextColor = [UIColor orangeColor]; 

//設定陰影的顏色和陰影的偏移位置 
scoreLabel.shadowColor = [UIColor redColor]; 
scoreLabel.shadowOffset = CGSizeMake(1.0,1.0); 


//設定是否能與使用者進行互動 
scoreLabel.userInteractionEnabled = YES;  

//設定label中的文字是否可變，預設值是YES  
scoreLabel.enabled = NO;


//設定字型大小是否適應label寬度 
label.adjustsFontSizeToFitWidth = YES; 
//如果adjustsFontSizeToFitWidth屬性設定為YES，下面這個屬性就來控制文字基線的行為
coreLabel.baselineAdjustment = UIBaselineAdjustmentNone
typedefenum {
    UIBaselineAdjustmentAlignBaselines =0,// default. used when shrinking text to position based on the original baseline
    UIBaselineAdjustmentAlignCenters,
    UIBaselineAdjustmentNone,
} UIBaselineAdjustment;

//最小文字號數
minimumFontSize

//設定背景色為透明 
scoreLabel.backgroudColor=[UIColor clearColor];

//自定義的顏色：
scoreLabel.textColor = [UIColor colorWithRed:1.0f green:50.0f blue:0.0f alpha:1.0f];

//UIColor 裡的 RGB 值是CGFloat型別的在0～1範圍內，對應0～255的顏色值範圍。
- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines;

//改變繪文字屬性.重寫時呼叫super可以按預設圖形屬性繪製,若自己完全重寫繪製函式，就不用呼叫super了.
- (void)drawTextInRect:(CGRect)rect;

//宣告UIlbel並指定其位置和長寬
UILabel *label = [[UILabelalloc] initWithFrame:CGRectMake(0, 0, 75, 40)]; 

//設定label的背景色，這裡設定為透明色。
 label.backgroundColor = [UIColorclearColor]; 
//設定label的字型和字型大小。 
label.font = [UIFont fontWithName:@"Helvetica-Bold" size:13];  

//lable的旋轉
 label.transform = CGAffineTransformMakeRotation(0.1);     //設定label的旋轉角度

//設定文字的陰影色彩和透明度。
label.shadowColor = [UIColorcolorWithWhite:0.1falpha:0.8f];  

//設定陰影的傾斜角度。  
label.shadowOffset = CGSizeMake(2.0f, 2.0f);     

//換行：如下換行可實現多行顯示，但要求label有足夠的寬度。
 label.lineBreakMode = UILineBreakModeWordWrap;     


//**label文字自動調整寬度和高度**
//初始化
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0,0,0,0)];
//初始行數為0
[label setNumberOfLines:0];
//label顯示文字
NSString *s = @"string......";
//設定字型
UIFont *font = [UIFont fontWithName:@"Arial" size:12];
//自定義大小
CGSize size = CGSizeMake(320,2000);
//重設label的size
CGSize labelsize = [s sizeWithFont:font constrainedToSize:size 
lineBreakMode:UILineBreakModeWordWrap];
//重設frame
[label setFrame:CGRectMake:(0,0, labelsize.width, labelsize.height)];
[self.view addSubView:label];
這樣就可以對s賦值讓其自動調整其大小了。

//UILabel跑馬燈效果

#import <UIKit/UIKit.h>
@interface TextFlowView : UIView { 
    //顯示文字的標籤
    UILabel *_firstLabel;
    UILabel *_secondLabel;   
    //定時器
    NSTimer *_timer;
    //顯示的文字
    NSString *_text;
    //是否需要滾動
    BOOL _needFlow;
    //控制元件的框架大小
    CGRect _frame;
    //文字的字型
    UIFont *_font;
    //當前第一個控制元件的索引
    NSInteger _startIndex;
    //定時器每次執行偏移後，累計的偏移量之和
    CGFloat _XOffset;
    //文字顯示一行，需要的框架大小
    CGSize _textSize;  
}
- (id)initWithFrame:(CGRect)frame Text:(NSString *)text;
- (void)setFont:(UIFont *)font;
- (void)setText:(NSString *)text;
@end

#import "TextFlowView.h"
@implementation TextFlowView
#pragma mark -
#pragma mark 內部呼叫
#define SPACE_WIDTH 50
#define LABEL_NUM 2

//改變一個TRect的起始點位置，但是其終止店點的位置不變，因此會導致整個框架大小的變化
- (CGRect)moveNewPoint:(CGPoint)point rect:(CGRect)rect
{
    CGSize tmpSize;
    tmpSize.height = rect.size.height + (rect.origin.y - point.y);
    tmpSize.width = rect.size.width + (rect.origin.x - point.x);
    returnCGRectMake(point.x, point.y, tmpSize.width, tmpSize.height);
}

//開啟定時器
- (void)startRun
{
    _timer = [NSTimerscheduledTimerWithTimeInterval:0.02target:selfselector:@selector(timerAction) userInfo:nilrepeats:YES];
}

//關閉定時器
- (void)cancelRun
{
    if (_timer) 
    {
        [_timerinvalidate];
    }
}

//定時器執行的操作
- (void)timerAction
{
    staticCGFloat offsetOnce = -1;
    _XOffset += offsetOnce;
    if (_XOffset +  _textSize.width <= 0) 
    {
        _XOffset += _textSize.width;
        _XOffset += SPACE_WIDTH;
    }
    [selfsetNeedsDisplay];   
}

//計算在給定字型下，文字僅顯示一行需要的框架大小
- (CGSize)computeTextSize:(NSString *)text
{
    if (text == nil) 
    {
        returnCGSizeMake(0, 0);
    }

    CGSize boundSize = CGSizeMake(10000, 100);
    CGSize stringSize = [_textsizeWithFont:_fontconstrainedToSize:boundSize lineBreakMode:UILineBreakModeWordWrap];
    return stringSize;

- (id)initWithFrame:(CGRect)frame Text:(NSString *)text
{
    self = [superinitWithFrame:frame];
    if (self) 
    {
        _text = [text retain];
        _frame = frame;
        //預設的字型大小
        _font = [UIFontsystemFontOfSize:16.0F];
        self.backgroundColor = [UIColorredColor];
        //初始化標籤
        //判斷是否需要滾動效果
        _textSize = [selfcomputeTextSize:text];
        //需要滾動效果
        if (_textSize.width > frame.size.width) 
        {
            _needFlow = YES;
            [selfstartRun];
        }
    }
    returnself;
}



- (void)drawRect:(CGRect)rect
{
    CGContextRef context= UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [UIColorwhiteColor].CGColor);
    // Drawing code
    CGFloat startYOffset = (rect.size.height - _textSize.height)/2;
    CGPoint origin = rect.origin;
    if (_needFlow == YES) 
    {
         rect = [selfmoveNewPoint:CGPointMake(_XOffset, startYOffset) rect:rect];
         while (rect.origin.x <= rect.size.width+rect.origin.x) 
        {
            [_textdrawInRect:rect withFont:_font];
            rect = [selfmoveNewPoint:CGPointMake(rect.origin.x+_textSize.width+SPACE_WIDTH, rect.origin.y) rect:rect];
        }

    }
    else
    {
        //在控制元件的中間繪製文字
        origin.x = (rect.size.width - _textSize.width)/2;
        origin.y = (rect.size.height - _textSize.height)/2;
        rect.origin = origin;
        [_textdrawInRect:rect withFont:_font];
    }
}
//此處，如果開啟了記憶體自動管理則沒必要加
- (void)dealloc
{
    [_textrelease];
    [superdealloc];
}

#pragma mark -
#pragma mark 外部呼叫
- (void)setFont:(UIFont *)font
{
    _font = font;
}
- (void)setText:(NSString *)text
{
    [_textrelease];
    _text = [text retain];
}
@end

美化UILabel中的字型程式碼分享

UILabel跑馬燈效果

垂直頂端對齊的UILabel

讓UILabel具有連結功能，點選後呼叫safari開啟網址

   UILabel *labelGovUrl = [[UILabel alloc] initWithFrame:CGRectMake(73.0, 330.0, 180.0, 40.0)];    
    labelGovUrl.autoresizingMask = (UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight);    
    labelGovUrl.text = @"儂儂官網 >";    
    labelGovUrl.backgroundColor = [UIColor clearColor];    
    labelGovUrl.textColor = [UIColor whiteColor];    
    labelGovUrl.font = [UIFont fontWithName:@"Helvetica-Bold" size:14];    
    labelGovUrl.userInteractionEnabled = YES;    
    labelGovUrl.tag = K_NNGOV_WEBSITE_LABEL_URL;    

    UITapGestureRecognizer *tapGesture =    
    [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(openURL:)] autorelease];    
    [labelGovUrl addGestureRecognizer:tapGesture];    
    [self.view addSubview:labelGovUrl];    
    [labelGovUrl release];    


-(void)openURL:(UITapGestureRecognizer *)gesture{    
    NSInteger tag = gesture.view.tag;    
    NSString *url = nil;    
    if (tag == K_NNWEIBO_LABEL_URL) {    
        url = @"http://t.qq.com/yourgame/";    
    }    
    if(tag == K_NNGOV_WEBSITE_LABEL_URL){    
        url = @"http://www.zjnn.cn/";    
    }    
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:url]];    
}