问题描述
我正在按照以下方式截取屏幕截图。
I'm taking the screenshot following way.
- (UIImage*)screenshot
{
UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
CGRect rect = [keyWindow bounds];
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[keyWindow.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
在UIView上我使用 UIBezierPath 。
On UIView I'm drawing paths using
UIBezierPath
.
我得到的屏幕截图不正确
The screenshots that I'm getting are incorrect like this
任何想法为什么上半部分是空白?在UIView上,所有绘图都正确显示。
Any ideas why the upper part is cut to blank ? On UIView all drawing is displayed correctly.
更新:当我用 UIBezierPath
当我发布我的画笔并获得屏幕截图时,它会正确获取截图。
UPDATE : This happens when I draw a long path with UIBezierPath
when I release the my brush and get the screenshot it gets the screenshot correctly.
推荐答案
我看到了你发布的另一个帖子。
根据,您需要先调整几何坐标。
所以,在渲染窗口层之前,先做一些事情。
I saw the another thread which you post.According to the apple technical Q&A, you need to adjust the geometry coordinate first.So, before render the layer of window, do following things first.
// -renderInContext: renders in the coordinate space of the layer,
// so we must first apply the layer's geometry to the graphics context
CGContextSaveGState(context);
// Center the context around the window's anchor point
CGContextTranslateCTM(context, [window center].x, [window center].y);
// Apply the window's transform about the anchor point
CGContextConcatCTM(context, [window transform]);
// Offset by the portion of the bounds left of and above the anchor point
CGContextTranslateCTM(context,
-[window bounds].size.width * [[window layer] anchorPoint].x,
-[window bounds].size.height * [[window layer] anchorPoint].y);
这篇关于UIBezierPath:视图截图的检索不正确的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!