//通过绘图的方式给图片设置圆角,而view的‘layer.cornerRadius’方法是离屏渲染,很消耗内存,所以可以通过下面的方法给图片设置圆角
//为imageView 添加类别,给imageView的图片设置圆角
-(void)imageWithCornerRadius:(CGFloat)radius
{
UIGraphicsBeginImageContextWithOptions(self.frame.size,NO, UIScreen.mainScreen.scale);
CGContextAddPath(UIGraphicsGetCurrentContext(), [UIBezierPathbezierPathWithRoundedRect:CGRectMake(0, 0,self.frame.size.width,self.frame.size.height)cornerRadius:radius].CGPath);
CGContextClip(UIGraphicsGetCurrentContext());
[self.imagedrawInRect:CGRectMake(0, 0,self.frame.size.width,self.frame.size.height)];
self.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
//为UIImage添加生成圆角的API方法
-(UIImage*)imageWithCornerRadius:(CGFloat)radius
{
CGRect rect = (CGRect){0.f, 0.f,self.size};
UIGraphicsBeginImageContextWithOptions(self.size,NO, UIScreen.mainScreen.scale);
CGContextAddPath(UIGraphicsGetCurrentContext(), [UIBezierPathbezierPathWithRoundedRect:rectcornerRadius:radius].CGPath);
CGContextClip(UIGraphicsGetCurrentContext());
[selfdrawInRect:rect];
UIImage* image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnimage;
}