UIImage+XMGExtension
.h文件
#import <UIKit/UIKit.h>
@interface UIImage (XMGExtension)
/**
* 圓形圖片
*/
- (UIImage *)circleImage;
@end
.m文件
#import "UIImage+XMGExtension.h"
@implementation UIImage (XMGExtension)
- (UIImage *)circleImage
{
// NO代表透明
UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0);
// 獲得上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
// 添加一個圓
CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
CGContextAddEllipseInRect(ctx, rect);
// 裁剪
CGContextClip(ctx);
// 將圖片畫上去
[self drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
@end
UIImageView+XMGExtension
.h文件
#import <UIKit/UIKit.h>
@interface UIImageView (XMGExtension)
- (void)setCircleImageWithUrl:(NSString *)url;
@end
.m文件
#import "UIImageView+XMGExtension.h"
#import <UIImageView+WebCache.h>
#import "UIImage+XMGExtension.h"
@implementation UIImageView (XMGExtension)
- (void)setCircleImageWithUrl:(NSString *)url
{
UIImage *placeholder = [[UIImage imageNamed:@"defaultUserIcon"] circleImage];
[self sd_setImageWithURL:[NSURL URLWithString:url] placeholderImage:placeholder completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
self.image = image ? [image circleImage] : placeholder;
}];
}
@end
說明：出自MJ
