给图片设置圆角 使用CALayer

现在添加头文件：
#import
<QuartzCore/QuartzCore.h>
UIImage *playImage=[UIImage
imageNamed:@"pic.png"];

UIImageView * headerImage = [[UIImageView
alloc] initWithFrame:CGRectMake(10.0, 10.0, 64.0, 64.0)];
headerImage.image = playImage;

CALayer * layer = [headerImage layer];
[layer
setMasksToBounds:YES];
[layer
setCornerRadius:20.0];
[layer
setBorderWidth:0.1];
[layer
setBorderColor:[[UIColor
blueColor] CGColor]];
此时headerImage便已是具有圆角的UIImageView了