以编程方式截取特定区域的屏幕截图

问题描述

就像您可以在我的代码中看到的一样，我截屏并将其保存到相册中.

Like you can see in my code, I take a screenshot and save it to the photo album.

//for retina displays
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, [UIScreen mainScreen].scale);
} else {
    UIGraphicsBeginImageContext(self.view.bounds.size);
}
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

在一开始，我使用了webview.size而不是self.view.bounds.size，并且由于视图位于0/0，所以它可以正常工作.但是现在我将WebView居中，但图片以给定大小的0/0开始.

At the beginning I used webview.size instead of self.view.bounds.size and it was working properly because the view was located at 0/0. But now I centered the WebView but the pictures is starts at 0/0 for the given size.

如何配置屏幕快照以给定大小从另一个location(例如300/150)开始?

How can I configure that the screenshot starts at another location (e.g. 300/150) for the given size?

或者还有其他方法可以拍摄UIWebView的照片?

Or is there another way to take a picture of an UIWebView?

推荐答案

我解决了问题，但未回答问题:

I solved my problem but didn't answer the question:

我创建了UIView的子类，并将我的UIWebView移到了那里，因此它相对于该子类位于0/0处.然后使用WebView的大小:

I created a subclass of UIView and moved my UIWebView in there, so that it is located 0/0 relative to the subclass. Then use the size of the WebView:

UIGraphicsBeginImageContext(webview.frame.size);

以及上面的其他代码.

现在，您可以将子类移动到所需的每个位置.

Now you can move the subclass to every location you want.

注意:如果您有日期/时间标签之类的标签，则也必须移动它们，否则将无法在图片上看到它们.

Note: If you have labels like date/time label you have to move them too or you won't see them on the picture.

问题仍然存在:那么可以为屏幕的特定区域拍照吗?

The question is still open:So is it possible to take a picture of a specific area of the screen?

亲切的问候. $ h @ rky

Kind Regards. $h@rky

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