如何在 iOS 中裁剪图像

问题描述

我有一个照片应用程序，您可以在其中在一个部分中添加贴纸.完成后，我想保存图像.这是我必须这样做的代码.

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.您可以在下面的链接中看到图像:http://dl.dropbox.com/u/19130454/照片%202012-04-09%201%2036%2018%20PM.png

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:左右91px距离底部 220 像素

I need to crop: 91px from the left and right 220px from the bottom

任何帮助将不胜感激.如果我没有解释清楚，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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