iOS 图片 的 聊天气泡显示 Objective-C

- (void)viewDidLoad {

    [super viewDidLoad];

    UIImageView *ImageView01 = [[UIImageView alloc] init];

    [ImageView01 setFrame:CGRectMake(, , , )];

    [ImageView01 setImage:[UIImage imageNamed:@"style.jpg"]];

    [self.view addSubview:ImageView01];

    UIImage *bubble = [UIImage imageNamed:@"icon_chat_right_bg"];

    UIImageView *ImageView = [[UIImageView alloc] init];

    [ImageView setFrame:ImageView01.frame];

    [ImageView setImage:[bubble stretchableImageWithLeftCapWidth: topCapHeight:]];

    CALayer *layer              = ImageView.layer;

    layer.frame                 = (CGRect){{,},ImageView.layer.frame.size};

    ImageView01.layer.mask = layer;

    [ImageView01 setNeedsDisplay];

如何实现聊天软件的图片显示的剪裁后的气泡呢