实现全局关闭所有键盘

//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;

}

我认为效率应该很低，慎用！！