iOS 将uiwindow上所有弹出键盘关闭

关闭UIwindow上所有弹出键盘,(可能情况:截屏了, 有键盘,键盘是系统的东西,你的截屏图片上没有键盘,导致截图空白,所以先关闭键盘,下面是关闭UIwindow上的键盘,键盘关闭是有动画的,需要延迟,刚调用关闭键盘方法之后,延迟0.3秒截屏)

下面keyboard结果为uiwindow是否有键盘弹出了,并且关闭了

bool keyBoard = NO;    for (UIView* view in window.subviews)    {        keyBoard = keyBoard?keyBoard:[self dismissAllKeyBoardInView:view];    }

//关闭window上所有view的键盘-(BOOL) dismissAllKeyBoardInView:(UIView *)view{    if([view isFirstResponder])    {        [view resignFirstResponder];        return YES;    }    for(UIView *subView in view.subviews)    {        if([self dismissAllKeyBoardInView:subView])        {            return YES;        }    }    return NO;}

下面方法可以直接关闭UIwindow上的键盘,但是不知道是否有键盘弹出了

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];