//1.1 初始化
    NSMutableArray *muArray = [NSMutableArray arrayWithObjects:@"123",@"345",@"2354", nil];
    NSMutableArray *mutAry = [NSMutableArray array];
    //從其它陣列中新增元素
    [mutAry addObjectsFromArray:muArray];
    //1.2 初始化劃好幾個元素容量的記憶體空間，當不超過元素個數時不需要重新請求記憶體，實際用得較少
    NSMutableArray *mutableAry = [[NSMutableArray alloc]initWithCapacity:4];
    [mutableAry addObject:@"1"];
    [mutableAry addObject:@"2"];
    [mutableAry addObject:@"3"];
    [mutableAry addObject:@"4"];
    [mutableAry addObject:@"1"];
    [mutableAry addObject:@"5"];
    [mutableAry addObject:@"6"];

    
    
    //=======增
    [muArray insertObject:@"456" atIndex:2];
    [muArray addObject:@"d"];
    NSLog(@"%@",muArray);
    
    
    //=======刪
    [muArray removeObject:@"123"];
    //刪除所有
//    [muArray removeAllObjects];
    //刪除陣列最後一個元素
    [muArray removeLastObject];
    //刪除指定範圍的@"1"值
    NSRange range = {2,5};
    //    [mutableAry removeObject:@"1" inRange:range];  //1234156  --> 123456
    //    [muarray removeObjectAtIndex:4];
    NSLog(@"%@",muArray);
    //刪除相同元素 及 刪除指定範圍內相同元素
//    [mutableAry removeObject:@"1"];
//    [mutableAry removeObjectIdenticalTo:@"1"];
//    [mutableAry removeObjectIdenticalTo:<#(nonnull id)#> inRange:<#(NSRange)#>]
    //根據另一陣列元素找出所對應的刪除
//    [mutableAry removeObjectsInArray:@[@"1",@"4",@"6"]];
    
    
    
    //========改
//    [muArray replaceObjectAtIndex:3  withObject:@"23"];
    NSLog(@"%@",muArray);
    
    
    
    //========查
    NSString *str = [muArray objectAtIndex:2];
    NSLog(@"%@",muArray[1]);
    NSLog(@"%@",str);
    
    
    //陣列中加入Number
    [muArray addObject:[NSNumber numberWithInt:3]];
    int i = [[muArray lastObject] intValue];
    [muArray addObject:[NSNumber numberWithFloat:2]];
    float y = [[muArray lastObject] floatValue];
    
    
    //元素調換位置   123456   3和5調換==》125436
    [mutableAry exchangeObjectAtIndex:2 withObjectAtIndex:4];
 

   陣列寫入本地檔案儲存

//- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)useAuxiliaryFile;
    //陣列寫入檔案儲存
    //從檔案轉成陣列  生成本地一個data.txt檔案拖到工程
    //沙盒根目錄路徑
    NSString *doucumonPath = [NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *fileName = @"data.plist"; //data.txt
    //根目錄下新建立資料夾路徑
    NSString *folderPath = [doucumonPath stringByAppendingPathComponent:@"myFolder"];
    //完整檔案路徑
    NSString *path = [folderPath stringByAppendingPathComponent:fileName];
    
    //建立檔案管理器
    NSFileManager *file=[NSFileManager defaultManager];
    if (![file fileExistsAtPath:folderPath]) {
        [[NSFileManager defaultManager] createDirectoryAtPath:folderPath withIntermediateDirectories:YES attributes:nil error:nil];
    }
    BOOL b = [mutableAry writeToFile:path atomically:YES];
    
    //獲取檔案陣列
    //專案路徑讀取
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"txt"];
    //沙盒路徑讀取
    NSMutableArray *fileAry = [NSMutableArray arrayWithContentsOfFile:path];
    //==================================================
 

</pre></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 13.5px; line-height: normal; font-family: Menlo; color: rgb(0, 175, 202);">arrayWithContentsOfURL</p><pre name="code" class="objc">//從URL轉為陣列
    //URL可以是 http://xxx.plist http://.xxx.xml  http://.xxx.txt 等下載地址
    NSURL *url = [NSURL fileURLWithPath:path];
    //本地URL:file:///var/mobile/Containers/Data/Application/6856FD5B-C8F1-4282-8DF3-D49B97355680/Library/Documentation/myFolder/data.xml

    BOOL bb = [mutableAry writeToURL:url atomically:YES];
    NSMutableArray *urlAry = [NSMutableArray arrayWithContentsOfURL:url];
 

//把非物件型別存入陣列 

想把一些view frame儲存到NSArray中，但是CGRect其實是結構體，必須封裝成物件才可以存入Array，Dictionary中，蘋果自帶NSValue封裝這些結構體，具體如下。

因為CGRect，CGPoint等不是NSObject的子類，因此不能夠直接新增到NSMutableArray中，所以要先將其轉換成NSObject的子類。NSValue類可以解決這個問題，見NSValue類的宣告：

如下，可以將CGRect，CGPoint等的數值轉換成NSValue類的數值。

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"lockButton.png"]];

imageView.frame = CGRectMake(10 * (l + 1) + imageView.frame.size.width * l, 120 + 50 * r, imageView.frame.size.width, imageView.frame.size.height);

[self.lockImageRectArray addObject:[NSValue valueWithCGRect:imageView.frame]];

[self addSubview:imageView];

通過下面的程式碼，又可以將NSValue轉換成CGRect，CGPoint等型別的數值。

CGRect imageRect = [[self.lockImageRectArray objectAtIndex:l] CGRectValue];

通過NSValue就可以實現CGxxx型別的數值儲存在NSMutable,NSDictionary型別的陣列中。