/*将数据显示到UI控件,注意只能在主线程中更新UI,     另外performSelectorOnMainThread方法是NSObject的分类方法，每个NSObject对象都有此方法，     它调用的selector方法是当前调用控件的方法，例如使用UIImageView调用的时候selector就是UIImageView的方法     Object：代表调用方法的参数,不过只能传递一个参数(如果有多个参数请使用对象进行封装)     waitUntilDone:是否线程任务完成执行 */[self performSelectorOnMainThread:@selector(updateImage:) withObject:data waitUntilDone:YES];

//初始化UIImageView  *imageView=[[UIImageView alloc] initWithFrame:CGRectMake(100, 200, 120, 120)];//需要设置图片 UIImage(第一种跟第二种会Cache到内存,消耗内存,但以后访问有优势,当只加载一次推荐用第三种)第一种：[imageView setImage:[UIImage imageNamed:@"1.jpeg"]];//第二种：NSString *filePath=[[NSBundle mainBundle] pathForResource:@"1" ofType:@"jpeg"];UIImage *images=[UIImage imageWithContentsOfFile:filePath];//[imageView setImage:images]; //第三种：NSData *data=http://www.mamicode.com/[NSData dataWithContentsOfFile:filePath];UIImage *image2=[UIImage imageWithData:data];[imageView setImage:image2];

首先要把这个子控件的属性增加一个tag,    UIButton* button= [UIButton buttonWithType:UIButtonTypeCustom];    button.tag=100;    button.frame=CGRectMake(130, 310, 60, 50);    [button addTarget:self action:@selector(play:) forControlEvents:UIControlEventTouchUpInside];    [button setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];    [self.view addSubview:button];然后再可以通过viewWithTag去获得,self.view是本视图,是Button的父视图    UIButton * button = (UIButton*)[self.view viewWithTag:100];

带一个参数,play:,就可以通过这个方法进行操作    //播放按钮    UIButton* button= [UIButton buttonWithType:UIButtonTypeCustom];    button.tag=100;    button.frame=CGRectMake(130, 310, 60, 50);    [button addTarget:self action:@selector(play:) forControlEvents:UIControlEventTouchUpInside];    [button setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];    [self.view addSubview:button];//播放-(void)play:(UIButton*)button{    if(_audioPlayer.playing)    {        [button setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];        [_audioPlayer pause];    }    else    {        [button setImage:[UIImage imageNamed:@"stop.png"] forState:UIControlStateNormal];        [_audioPlayer play];    }    }

- (void)viewDidLoad{    [super viewDidLoad];        self.title=@"判断是否是模拟机";    [self isSimulator];}-(void)isSimulator{    if (TARGET_IPHONE_SIMULATOR) {        NSLog(@"是模拟机");    }else{        NSLog(@"不是模拟机");    }}

- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view.        UIView *view=[[UIView alloc]initWithFrame:CGRectMake(50, 100, 200, 200)];    view.backgroundColor=[self colorWithHexString:@"e26562"];    [self.view addSubview:view];    }//16进制颜色#e26562与UIColor互转,设置View背景颜色- (UIColor *) colorWithHexString: (NSString *)color{    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];        // String should be 6 or 8 characters    if ([cString length] < 6) {        return [UIColor clearColor];    }        // strip 0X if it appears    if ([cString hasPrefix:@"0X"])        cString = [cString substringFromIndex:2];    if ([cString hasPrefix:@"#"])        cString = [cString substringFromIndex:1];    if ([cString length] != 6)        return [UIColor clearColor];        // Separate into r, g, b substrings    NSRange range;    range.location = 0;    range.length = 2;        //r    NSString *rString = [cString substringWithRange:range];        //g    range.location = 2;    NSString *gString = [cString substringWithRange:range];        //b    range.location = 4;    NSString *bString = [cString substringWithRange:range];        // Scan values    unsigned int r, g, b;    [[NSScanner scannerWithString:rString] scanHexInt:&r];    [[NSScanner scannerWithString:gString] scanHexInt:&g];    [[NSScanner scannerWithString:bString] scanHexInt:&b];        return [UIColor colorWithRed:((float) r / 255.0f) green:((float) g / 255.0f) blue:((float) b / 255.0f) alpha:1.0f];}