本文介绍了调整应用内屏幕截图的大小的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在截取特定区域的屏幕截图时出现问题.我在底部有一个标签栏,在顶部有一个工具栏.我想在这两个栏之间截取屏幕截图.下面是我的代码.如何改善我的代码以消除障碍?
I am having problem in taking a screenshot with specific area. I have a tabbar at the bottom and a toolbar at the top. I would like to take a screenshot of the screen between those two bars. Below is my code. How can i improve my code to crop out the bars?
谢谢
CGSize imageSize = [[UIScreen mainScreen] bounds].size;
if (NULL != UIGraphicsBeginImageContextWithOptions)
UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
else
UIGraphicsBeginImageContext(imageSize);
CGContextRef context = UIGraphicsGetCurrentContext();
// Iterate over every window from back to front
for (UIWindow *window in [[UIApplication sharedApplication] windows])
{
if (![window respondsToSelector:@selector(screen)] || [window screen] == [UIScreen mainScreen])
{
// -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);
// Render the layer hierarchy to the current context
[[window layer] renderInContext:context];
// Restore the context
CGContextRestoreGState(context);
}
}
// Retrieve the screenshot image
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(image, self, @selector(imageSavedToPhotosAlbum: didFinishSavingWithError: contextInfo:), nil);
推荐答案
我想您可以在创建最终的UIImage之后尝试裁剪所需的部分.
I suppose you could try cropping out the part you need after creating the final UIImage.
CGRect contentRectToCrop = CGRectMake(0, 44, 320, 392);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], contentRectToCrop);
UIImage *croppedImage = [UIImage imageWithCGImage:imageRef];
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