圆形图片剪切 iOS

来源：互联网发布：乌得勒支大学知乎编辑：程序博客网时间：2024/06/05 18:29

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#import <UIKit/UIKit.h>

@interface UIImage (ImageCircle)
-(UIImage *)ImageClipCircle;
@end

#import "UIImage+ImageCircle.h"
@interface view : UIView
@property(nonatomic,strong)UIImage *image;
@end
@implementation view

-(void)drawRect:(CGRect)rect{
    //获取上下文
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    //开始需改状态
    CGContextSaveGState(ctx);
    //绘制圆形
    CGContextAddEllipseInRect(ctx, CGRectMake(0, 0, rect.size.width/2, rect.size.height/2));
    //圆圈裁剪出来
    CGContextClip(ctx);
    //添加路径
    CGContextFillPath(ctx);
    //图片绘制
    [_image drawAtPoint:CGPointMake(0, 0)];


    //恢复状态
    CGContextRestoreGState(ctx);
}

@end
@implementation UIImage (ImageCircle)
-(UIImage *)ImageClipCircle{
    //我们绘制的圆是UIView，通过上下文等将其转化成UIImage
    CGFloat ImageSizeMin = MIN(self.size.width, self.size.height);
    CGSize imageSize = CGSizeMake(ImageSizeMin, ImageSizeMin);
    view *mview = [[view alloc]init];
    mview.image = self;
    //开始绘制
    UIGraphicsBeginImageContext(imageSize);
    CGContextRef context = UIGraphicsGetCurrentContext();
    mview.frame = CGRectMake(0, 0, ImageSizeMin, ImageSizeMin);
    mview.backgroundColor =[UIColor whiteColor];
    [mview.layer renderInContext:context];
    UIImage *imageNew = UIGraphicsGetImageFromCurrentImageContext();
    //结束绘制
    UIGraphicsEndImageContext();

    return imageNew;
}
@end

在ViewController中

- (void)viewDidLoad {
    [super viewDidLoad];

    [self imageCircle];

}

-(void)imageCircle{
    UIImage *image =[UIImage imageNamed:@"1"];
    UIImage *imageNew =[image ImageClipCircle];
    UIImageWriteToSavedPhotosAlbum(imageNew, nil, nil, nil); //保存图片到手机相册
}
添加 <key>NSPhotoLibraryUsageDescription</key> <string>App需要您的同意,才能访问相册</string> iOS 10如果访问必须添加否则闪退

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