UIImage添加生成圆角图片

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给UIImage添加生成圆角图片的扩展API：这是on-screen-rendering

- (UIImage *)imageWithCornerRadius:(CGFloat)radius {

CGRect rect = (CGRect){0.f, 0.f, self.size};

UIGraphicsBeginImageContextWithOptions(self.size,NO,UIScreen.mainScreen.scale);

CGContextAddPath(UIGraphicsGetCurrentContext(), [UIBezierPathbezierPathWithRoundedRect:rect cornerRadius:radius].CGPath);

CGContextClip(UIGraphicsGetCurrentContext());

[selfdrawInRect:rect];

UIImage*image =UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

returnimage;