iPhone snapshot including keyboard

问题

I'm looking for the proper way to snapshot the entire iPhone screen including the keyboard.

i found some code to snapshot the screen:

CGRect screenCaptureRect = [UIScreen mainScreen].bounds;
UIView *viewWhereYouWantToScreenCapture = [[UIApplication sharedApplication] keyWindow];
//screen capture code
UIGraphicsBeginImageContextWithOptions(screenCaptureRect.size, NO, [UIScreen mainScreen].scale);
[viewWhereYouWantToScreenCapture drawViewHierarchyInRect:screenCaptureRect afterScreenUpdates:NO];
UIImage *capturedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

but it doesn't capture the keyboard as well. it looks like the keyWindow doesn't include the keyboard view.

btw I need UIImage as final result, not UIView, so I can't use other snapshot API's.

Any ideas of to do that and with best performance?

回答1:

Keyboard is placed in other window. And in iOS9 keyboard accessory placed in different one. So the best solution is to render all windows.

Here is working code:

- (UIImage*)fullScreenShot {
    CGSize imgSize = [UIScreen mainScreen].bounds.size;
    UIGraphicsBeginImageContextWithOptions(imgSize, NO, 0);
    for (UIWindow* window in [UIApplication sharedApplication].windows) {
        if (![window respondsToSelector:@selector(screen)] || window.screen == [UIScreen mainScreen]) {
            [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES];
        }
    }
    UIImage* img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}

回答2:

You are right, the keyboard is displayed in another window. So instead of getting only one window using [[UIApplication sharedApplication] keyWindow], you should get all windows using [[UIApplication sharedApplication] windows] and for each of them call [viewWhereYouWantToScreenCapture drawViewHierarchyInRect:screenCaptureRect afterScreenUpdates:NO] so that all of them are drawn inside one image context.

回答3:

iOS renders keyboard under a window with the description UITextEffectsWindow.

You can iterate all windows using and find the right one using:

for (UIWindow *window in [[UIApplication sharedApplication] windows]) { if ([window.class.description isEqualToString:@"UITextEffectsWindow"]) { return window; } }

When you're done, you can render it into your context using renderInContext or drawViewHierarchyInRect. renderInContext might be slower but safer (because it's done on the main thread,) and drawViewHierarchyInRect is faster (doesn't affect the main thread,) but might crash due to a bug in iOS code.

来源：https://stackoverflow.com/questions/28169843/iphone-snapshot-including-keyboard