如何在iOS上使用代码拍摄屏幕截图? [英] How to take a screenshot using code on iOS?

问题描述

如何以编程方式拍摄屏幕截图?

How to take a screenshot programmatically?

推荐答案

您可以将UIGraphicsBeginImageContext用于此目的.

You can use UIGraphicsBeginImageContext for this purpose.

例如:

UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, self.view.opaque, 0.0);
[self.myView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage*theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

NSData*theImageData = UIImageJPEGRepresentation(theImage, 1.0 ); //you can use PNG too
[theImageData writeToFile:@"example.jpeg" atomically:YES];

这里

1..首先，我获取图像上下文，将其命名为myView，这是一个Web视图，您可以根据需要提供任何内容.这将获得可以在屏幕上看到的webview图像.

1. First i take the image context, i've given it as myView which is a webview, you can give whatever you wish for. This takes the image of webview that can be seen on the screen.

2 我使用UIGraphicsGetImageFromCurrentImageContext()将网络视图的屏幕截图转换为图像.

2 Using UIGraphicsGetImageFromCurrentImageContext() i convert the screenshot of my webview into an image.

3..我要求使用UIGraphicsEndImageContext()结束上下文.

3. By using UIGraphicsEndImageContext() i ask it end the context.

4..我将图像保存到NSData中，因为我必须将屏幕截图发送出去.并将其保存在NSData中似乎是个不错的选择.

4. I'm saving the image into an NSData because i had to mail the screenshot. And keep it in NSData seemed a good option if it is used to send or save.

要将其添加到相机胶卷中，您需要编写:

To add it to the camera roll you need to write:

UIImageWriteToSavedPhotosAlbum(theImage,nil,NULL,NULL);

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