自定义圆角

UIImageView添加圆角

最直接的方法就是使用如下属性设置:

imgView.layer.cornerRadius = 10;
// 这一行代码是很消耗性能的
imgView.clipsToBounds = YES;
**这是离屏渲染(off-screen-rendering),消耗性能的**

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(),
 [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radius].CGPath);
CGContextClip(UIGraphicsGetCurrentContext());
 
[self drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
 
UIGraphicsEndImageContext();
 
return image;
}

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