第一种：

就拿view来举例view.layer.masksToBounds=YES; //设置为yes，就可以使用圆角view.layer.cornerRadius= 5; //设置它的圆角大小view.layer.borderWidth=1; //视图的边框宽度view.layer.borderdg= [[UIdggray  dg].CGdg]; //视图的边框颜色

 

第二种：

//初始化CAShapeLayer    CAShapeLayer *shapeLayer = [CAShapeLayer layer];    //设置shapeLayer路径和圆角弧度    shapeLayer.path = [UIBezierPath bezierPathWithRoundedRect:                       self.imageView.bounds cornerRadius:40].CGPath;    //设置ImageView的蒙版    self.imageView.layer.mask = shapeLayer;

第三种：

-(UIImage *)getImageRadius:(CGFloat)radius andImage:(UIImage *)image{    CGFloat scale = [UIScreen mainScreen].scale;    UIGraphicsBeginImageContextWithOptions(image.size, NO, scale);    CGContextRef c = UIGraphicsGetCurrentContext();    CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radius];    CGContextAddPath(c, path.CGPath);    CGContextClip(c);    [image drawInRect:rect];    CGContextDrawPath(c, kCGPathFillStroke);    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return img;}