Ios Whatsapp样式-键盘显示在工具栏下

我该怎么做whatsapp风格，当点击消息空间时，会将键盘从底部向上推，同时也会将工具栏向上推。然后，当取消时（即在后台单击），它将使用工具栏向下按键盘

这是通过U

IKeyboardWillShowNotification

、

UIKeyboardDidShowNotification

、

UIKeyboardWillHideNotification

和

UIKeyboardDidenotification

通知完成的。 然后在处理通知时，调整框架的高度：

例如：

- (void) keyboardWillShow:(NSNotification *)aNotification{

    NSDictionary* info = [aNotification userInfo];
    NSTimeInterval duration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    NSValue* aValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];
    CGFloat keyboardHeight = [aValue CGRectValue].size.height;

    self.keyboardVissible = YES;

    [UIView animateWithDuration:duration animations:^{
        CGRect frame = self.contentView.frame;
        frame.size.height -= keyboardHeight;
        self.contentView.frame = frame;
    }];
}

您需要注册以接收通知，您应该只在视图可见时收听键盘通知，如果您在

viewDidLoad

中执行此操作，可能会发生奇怪的事情：

- (void) viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void) viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

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什么是fetchedResultsController？实际上我自己还不知道。键盘可视是什么？它只是一个额外的

BOOL

我用来跟踪键盘是否可见。