UIImageView添加圓角
最直接的方法就是使用如下屬性設(shè)置：
imgView.layer.cornerRadius = 10;// 這一行代碼是很消耗性//
imgView.clipsToBounds = YES;//這是離屏渲染（off-screen-rendering）粹庞，消耗性能的使用到了CPU//
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};
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UIGraphicsBeginImageContextWithOptions(self.size, NO, UIScreen.mainScreen.scale);
CGContextAddPath(UIGraphicsGetCurrentContext(),
[UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radius].CGPath);
CGContextClip(UIGraphicsGetCurrentContext());
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[self drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return image;
}
