准备一张这种气泡效果的背景图，然后将这个气泡图做成一个layer实例，并且通过contentCenter或者contentRect拉伸至我们需要展示的UIImageView大小
将做好的layer实例赋给UIImageView
将imageview赋上图片
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CGRect frame = CGRectMake(20, 100, 300, 300);
UIImageView *image = [[UIImageView alloc] initWithFrame:frame];
CAShapeLayer *layer = [CAShapeLayer layer];
layer.frame = image.bounds;
layer.contents = (id)[UIImage imageNamed:@"chat.png"].CGImage;
layer.contentsCenter = CGRectMake(0.5, 0.5, 0.1, 0.1);
layer.contentsScale = [UIScreen mainScreen].scale;
image.layer.mask = layer;
image.layer.frame = image.frame;
image.image = [UIImage imageNamed:@"1.jpg"];
[self.view addSubview:image];
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