使用AspectFill裁剪并保存UIImageView的可见区域 [英] Crop and save visible region of UIImageView using AspectFill

问题描述

我有一个全屏UIImageView，其中的图像设置为AspectFill（全出血），在使用Aspect Fill内容模式时，如何仅保存图像的可见部分？

I have a fullscreen UIImageView with a image in it set to AspectFill (full bleed), how can I save only the visible portion of the image when its using the Aspect Fill content mode?

CGRect visibleRect;   
visibleRect.size= mImageView.frame.size;
CGImageRef cropped_img = CGImageCreateWithImageInRect(mImageView.image.CGImage, visibleRect);
UIImage *finalImage = [[UIImage alloc]initWithCGImage:cropped_img];
UIImageWriteToSavedPhotosAlbum(finalImage, nil, nil, nil);

这是我当前的代码，裁剪和保存工作，只是无法正确裁剪。有什么想法吗？

This is my current code, cropping and saving works, its just not cropping correctly. Any ideas?

推荐答案

尝试一下：

UIGraphicsBeginImageContext(mImageView.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGImageRef image = CGBitmapContextCreateImage(context);
width = CGImageGetWidth(image);
height = CGImageGetHeight(image);
CGImageRef cropped_img = CGImageCreateWithImageInRect(image, CGRectMake(0, 0, width, height));

//保存...

CGImageRelease(image);
UIGraphicsEndImageContext();

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