Coregraphics切反向圆角

效果图

E1819704-B84B-4741-BB28-4B87A1883EDF.png

 
    UIImageView *iamgeview =[[UIImageView alloc]initWithFrame:CGRectMake(20, 100, 200, 200)];
    UIImage *image = [UIImage imageNamed:@"gougou"];

//    iamgeview.image =
    iamgeview.image = [self addClipWithImage:image];

    [self.view addSubview:iamgeview];

-(UIImage *)addClipWithImage:(UIImage *)image{
    
    //1、开启上下文
    UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
   
    //2、设置裁剪区域
    //    UIBezierPath * path = [UIBezierPath bezierPathWithOvalInRect:rect];
 
    
    UIBezierPath * path = [UIBezierPath bezierPathWithRect:CGRectMake(0,0,image.size.width, image.size.height)];
    
    [path addArcWithCenter:CGPointMake(image.size.width, 0) radius:10 startAngle:- M_PI  endAngle:-M_2_PI clockwise:NO];
    [path closePath];
    [path addClip];
    //3、绘制图片
    [image drawAtPoint:CGPointZero];
    //4、获取新图片
    UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
    //5、关闭上下文
    UIGraphicsEndImageContext();
    //6、返回新图片
    return newImage;

  
}