[IOS Code]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;
}