是否可以在我的 IOS 应用程序启动之前截屏。
我可以通过以下方式简单地截取我的应用程序的主视图：
UIGraphicsBeginImageContext(self.view.frame.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);
我也试过这种方法 UIKit 方式：
// Create a graphics context with the target size
// On iOS 4 and later, use UIGraphicsBeginImageContextWithOptions to take the scale into consideration
// On iOS prior to 4, fall back to use UIGraphicsBeginImageContext
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();
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
UIGraphicsEndImageContext();
他们都致力于捕获我的应用程序的屏幕截图。
在我的应用程序启动之前，我如何捕获（当前的）屏幕截图。
我什至将第二个示例代码添加到 main.m 的开头，它不起作用。（已保存全屏空白图像）
我想使用屏幕截图作为我的应用程序的背景图片 :)
