iOS-图片裁剪

1. Quartz2D

    UIImage *oldImage = [UIImageimageNamed:@"me"];

    UIGraphicsBeginImageContextWithOptions(oldImage.size,NO,
0.0);

    CGContextRef ctx =UIGraphicsGetCurrentContext();
   CGContextAddEllipseInRect(ctx,
CGRectMake(0,
0, oldImage.size.width, oldImage.size.height));

    CGContextClip(ctx);
    [oldImagedrawInRect:CGRectMake(0,0,
oldImage.size.width, oldImage.size.height)];

    self.iconView.image
= UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

2.CALayer (圆角裁剪)

    self.iconView.layer.cornerRadius =10;

    self.iconView.layer.masksToBounds
= YES;