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給UIImage添加生成圓角圖片的擴(kuò)展API：這是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;
