图片加圆角

- (UIImage*)imageAddCornerWithRadius:(CGFloat)radius andSize:(CGSize)size{

CGRect rect = CGRectMake(0, 0, size.width, size.height);

UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);

CGContextRef ctx = UIGraphicsGetCurrentContext();

UIBezierPath* path = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(radius, radius)];

CGContextAddPath(ctx, path.CGPath);

CGContextClip(ctx);

[self drawInRect:rect];

CGContextDrawPath(ctx, kCGPathFillStroke);

UIImage* image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return image;

}