如何在iOS中裁剪图像

问题描述

我有一个照片应用，你可以在一个部分添加贴纸。当你完成后我想保存图像。这是我必须要做的代码。

I have a photo app where you can add stickers in one section. When you're finished I want to save the image. Here is the code that I have to do that.

if(UIGraphicsBeginImageContextWithOptions != NULL)
{
    UIGraphicsBeginImageContextWithOptions(self.view.frame.size, YES, 2.5);
} else {
    UIGraphicsBeginImageContext(self.view.frame.size);
}
CGContextRef contextNew=UIGraphicsGetCurrentContext();

[self.view.layer renderInContext:contextNew];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

现在保存的图像是图像的全屏，这很好，但现在我需要裁剪图像，我不知道如何。您可以在以下链接中看到图像：

Now the image that gets saved is the full screen of the image, which is fine, but now I need to crop the image and I don't know how. You can see the image at the link below:http://dl.dropbox.com/u/19130454/Photo%202012-04-09%201%2036%2018%20PM.png

我需要裁剪：
91px从左到右
220px从底部

I need to crop:91px from the left and right220px from the bottom

任何帮助都将不胜感激。如果我没有清楚地解释清楚，请告诉我，我会尽力重新解释。

Any help would be greatly appreciated. If I haven't explained things clearly, please let me know and I'll do my best to re-explain.

推荐答案

这样的事情怎么样

CGRect clippedRect  = CGRectMake(self.view.frame.origin.x+91, self.view.frame.origin.y, self.view.frame.size.width-91*2, self.view.frame.size.height-220);
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], clippedRect);
UIImage *newImage   = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);

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