就拿view来举例

view.layer.masksToBounds=YES; //设置为yes，就可以使用圆角

view.layer.cornerRadius= ; //设置它的圆角大小

view.layer.borderWidth=; //视图的边框宽度

view.layer.borderdg= [[UIdggray  dg].CGdg]; //视图的边框颜色

//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:].CGPath;

    //设置ImageView的蒙版

    self.imageView.layer.mask = shapeLayer;

-(UIImage *)getImageRadius:(CGFloat)radius andImage:(UIImage *)image{

    CGFloat scale = [UIScreen mainScreen].scale;

    UIGraphicsBeginImageContextWithOptions(image.size, NO, scale);

    CGContextRef c = UIGraphicsGetCurrentContext();

    CGRect rect = CGRectMake(, , 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;

}