实现全局关闭所有键盘,actionSheet和alertView

在多页面的IOS程序中，当切换页面时，需要先将keyBoard,actionSheet或alertView这类模态化窗口隐藏。

以下代码分别实现全局关闭actionSheet和alertView，全局隐藏所有键盘。

关闭所有actionSheet和alertView:

- (void)closeModalView
{
    for (UIWindow* window in [UIApplication sharedApplication].Windows)
    {
        for (UIView* view in window.subviews)
        {
            [self dismissActionSheetAndAletrtViewInView:view];
        }
    }
}

- (void)dismissActionSheetAndAletrtViewInView:(UIView*)view
{
    if ([view isKindOfClass:[UIActionSheet class]])
    {
        UIActionSheet *actionView = (UIActionSheet *)view;
        [actionView dismissWithClickedButtonIndex:actionView.cancelButtonIndex animated:NO];
    }
    else if ([view isKindOfClass:[UIAlertView class]])
    {
        UIAlertView *alertView = (UIAlertView *)view;
        [alertView dismissWithClickedButtonIndex:alertView.cancelButtonIndex animated:NO];
    }
    else
    {
        for (UIView* subView in view.subviews)
        {
            [self dismissActionSheetAndAletrtViewInView:subView];
        }
    }
}

隐藏所有键盘：

- (void)hideKeyBoard
{
    for (UIWindow* window in [UIApplication sharedApplication].windows)
    {
        for (UIView* view in window.subviews)
        {
            [self dismissAllKeyBoardInView:view];
        }
    }
}

-(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;
}