IOS如何制作 View 覆盖键盘

Question

我遇到了一个问题:

我有一个像这样的 View Controller 。

为了在键盘出现时使工具栏向上，我将 self.view 向上移动。

[self.view setFrame:CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y + keyboardFrame.size.height * (up ? -1 : 1), self.view.frame.size.width, self.view.frame.size.height)];

现在我想点击工具栏中的左侧按钮，出现与该键盘框架相同的 View 。

但是我可以在哪里添加这个 View 呢？ 如果将 subview 添加到self.view中，它将与键盘顶部的self.view一起向上移动，而不是覆盖。 我是IOS的初学者，我对此一无所知，并进行了搜索，但对此一无所知。

还有一个问题，如果当底部的工具栏时，我也想点击它的左键来显示 View (动画和框架都与键盘相同)，我该怎么办？

你能帮我吗？ 谢谢

Answer 1

我说得对吗，你想弹出键盘上方与键盘上下相连的栏吗？

然后，您必须注册键盘显示和隐藏通知，并根据通知和键盘显示和隐藏速度对 View 进行上下动画。

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

[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(keyboardWillHide:) 
                                             name:UIKeyboardWillHideNotification 
                                           object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWasShown:)
                                             name:UIKeyboardDidShowNotification object:nil];

现在您必须实现所有选择器方法:

//Code from Brett Schumann
-(void) keyboardWillShow:(NSNotification *)note{
    // get keyboard size and loctaion
    CGRect keyboardBounds;
    [[note.userInfo valueForKey:UIKeyboardFrameEndUserInfoKey] getValue: &keyboardBounds];
    NSNumber *duration = [note.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSNumber *curve = [note.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey];

    // Need to translate the bounds to account for rotation.
    keyboardBounds = [self.view convertRect:keyboardBounds toView:nil];

    // get a rect for the textView frame
    CGRect containerFrame = containerView.frame;
    containerFrame.origin.y = self.view.bounds.size.height - (keyboardBounds.size.height + containerFrame.size.height);
    // animations settings
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:[duration doubleValue]];
    [UIView setAnimationCurve:[curve intValue]];

    // set views with new info
    containerView.frame = containerFrame;

    // commit animations
    [UIView commitAnimations];

    [self showSendButton];
}

-(void) keyboardWillHide:(NSNotification *)note{
    NSNumber *duration = [note.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSNumber *curve = [note.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey];

    // get a rect for the textView frame
    CGRect containerFrame = containerView.frame;
    containerFrame.origin.y = self.view.bounds.size.height - containerFrame.size.height;

    // animations settings
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:[duration doubleValue]];
    [UIView setAnimationCurve:[curve intValue]];

    // set views with new info
    containerView.frame = containerFrame;

    // commit animations
    [UIView commitAnimations];

    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0, 0, containerView.frame.size.height-46.0f+20.0f, 0);
    _table.contentInset = contentInsets;
    _table.scrollIndicatorInsets = contentInsets;

    //display button based on facebook login status
    if ([facebookService.facebook isSessionValid]) {
        [commentButton makeButtonLogoutButton];
        textView.editable = YES;
    } else {
        [commentButton makeButtonLoginButton];
        textView.editable = NO;
    }
}

- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height+20.0f, 0.0);
    _table.contentInset = contentInsets;
    _table.scrollIndicatorInsets = contentInsets;
}

请务必用您自己的 View 替换键盘顶部的给定 View 。该 View 应该是包含所有按钮和内容的单个 View 。

问候