ios 图片裁剪

UIImage *image = [UIImageimageNamed:@"knockwurst.jpg"];

    

    

    UIGraphicsBeginImageContextWithOptions(image.size,NO, 0);

    

    

    

    NSLog(@"%f,%f",image.size.width,image.size.height);

    

    

    UIBezierPath *path = [UIBezierPathbezierPathWithOvalInRect:CGRectMake(0,0, image.size.width, image.size.height)];

    [path addClip];

    

    [image drawAtPoint:CGPointZero];

    

    

    UIImage *image1 =UIGraphicsGetImageFromCurrentImageContext();

    

    UIGraphicsEndImageContext();

    

    

    UIImageView *view = [[UIImageViewalloc]initWithFrame:CGRectMake(0,300, 300,300)];

    

    view.image = image1;

    

    

    

    [self.viewaddSubview:view];