来自UIGraphicsGetImageFromCurrentImageContext（）的更高质量的图像 [英] Better quality image from UIGraphicsGetImageFromCurrentImageContext()

问题描述

我目前正在使用 UIGraphicsGetImageFromCurrentImageContext（）将内容的图像保存到用户的相机胶卷，但图像质量比在模拟器中进行屏幕截图时差。有没有办法改善它？无论如何，保存的图像的格式是什么？ BMP？有没有办法改变这个？

I'm currently using UIGraphicsGetImageFromCurrentImageContext() to save a content's image to a user's camera roll, but the image quality is worse than if I do a screen shot in the simulator. Is there any way to improve it? And what format the saved image is in anyway? Bmp? Is there any way to change this?

这是我的保存代码：

CGSize size = [content bounds].size;
UIGraphicsBeginImageContext(size);
[[content layer] renderInContext:UIGraphicsGetCurrentContext()];
UIImage *originalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

UIImageWriteToSavedPhotosAlbum(originalImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

推荐答案

而不是使用 UIGraphicsBeginImageContext 你应该使用：

Instead of using UIGraphicsBeginImageContext you should be using:

UIGraphicsBeginImageContextWithOptions(size, NO, 0);

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