获取键盘变更消息-优快云博客

本文介绍了如何在iOS应用中注册键盘的通知，并提供了处理键盘显示和隐藏时调整UIScrollView大小的具体实现方式。通过监听UIKeyboardDidShowNotification和UIKeyboardDidHideNotification，可以确保当键盘弹出或收起时，输入元素依然可见。

转自：http://www.cocoachina.com/bbs/simple/?t41614.html

- (void) registerForKeyboardNotificati*****{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasHidden:) name:UIKeyboardDidHideNotification object:nil];

}

- (void) keyboardWasShown:(NSNotification *) notif{
    NSDictionary *info = [notif userInfo];

    NSValue *value = [info objectForKey:UIKeyboardBoundsUserInfoKey];
    CGSize keyboardSize = [value CGRectValue].size;

    CGRect scrollViewFrame= [scrollView frame];
    scrollViewFrame.size.height -= keyboardSize.height;
    scrollView.frame = scrollViewFrame;
    [scrollView scrollRectToVisible:inputElementFrame animated:YES];
    keyboardWasShown = YES;
}

- (void) keyboardWasHidden:(NSNotification *) notif{
    NSDictionary *info = [notif userInfo];

    NSValue *value = [info objectForKey:UIKeyboardBoundsUserInfoKey];
    CGSize keyboardSize = [value CGRectValue].size;

    CGRect scrollViewFrame= [scrollView frame];
    scrollViewFrame.size.height += keyboardSize.height;
    scrollView.frame = scrollViewFrame;
    keyboardWasShown = NO;

}