一般情况下，可使用较快速的设置方法：
UIImageView*headerImageView = [[UIImageViewalloc]initWithFrame:CGRectMake(10,10,45,45)];
headerImageView.image= [UIImageimageNamed:@"image.jpeg"];
headerImageView.layer.cornerRadius=90/4;//设置圆角
headerImageView.layer.masksToBounds=true;//利用masksToBounds隐藏不需要渲染的部分
[self.view addSubview:headerImageView];
另外，我们可以用Core Graphics自己画：
@interfaceUIImage (RadioImage)
- (UIImage*)hm_drawRectWithRoundedCorner:(CGFloat)radius SizeToFit:(CGSize)sizeToFit;
@end
#import"UIImage+RadioImage.h"
@implementationUIImage (RadioImage)
- (UIImage*)hm_drawRectWithRoundedCorner:(CGFloat)radius SizeToFit:(CGSize)sizeToFit
{
CGRectrect =CGRectMake(0,0, sizeToFit.width, sizeToFit.height);
UIBezierPath*path = [UIBezierPathbezierPathWithRoundedRect:rectbyRoundingCorners:UIRectCornerAllCornerscornerRadii:CGSizeMake(radius, radius)];
UIGraphicsBeginImageContextWithOptions(rect.size,false, [[UIScreenmainScreen]scale]);
CGContextAddPath(UIGraphicsGetCurrentContext(), path.CGPath);
CGContextClip(UIGraphicsGetCurrentContext());
[selfdrawInRect:rect];
CGContextDrawPath(UIGraphicsGetCurrentContext(),kCGPathFillStroke);
UIImage*outputImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnoutputImage;
}
@end
@interfaceUIImageView (RadioImageView)
- (void)hm_addCorner:(CGFloat)radius;
@end
#import"UIImageView+RadioImageView.h"
#import"UIImage+RadioImage.h"
@implementationUIImageView (RadioImageView)
- (void)hm_addCorner:(CGFloat)radius
{
self.image= [self.image hm_drawRectWithRoundedCorner:radiusSizeToFit:self.bounds.size];
}
@end
使用的时候倒入“UIImageView+RadioImageView.h”
UIImageView *headerImageView = [[UIImageView alloc]initWithFrame:CGRectMake(10,10,45,45)];
headerImageView.image= [UIImageimageNamed:@"header.jpeg"];
[headerImageView hm_addCorner:30];
[cell.contentView addSubview:headerImageView];
