Question

我正在ios中开发一个聊天应用程序，我有自定义的tableview和UIView，底部有一些textfield ane按钮。当Textfield被激活时，我想用键盘移动UIView和Tableview。我有这个观察者：

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

然后是keyboardWasShown方法：

- (void)keyboardWasShown:(NSNotification*)aNotification{
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
NSNumber *number = [info objectForKey:UIKeyboardAnimationDurationUserInfoKey];
double duration = [number doubleValue];
    [UIView animateWithDuration:duration animations:^{

        CGRect frame = textInputView.frame;
        if (UIDeviceOrientationIsPortrait([UIDevice currentDevice].orientation))
        {
            self.kHeight = kbSize.height;
        }
        else if(UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation))
        {
            self.kHeight = kbSize.width;
        }
        NSLog(@"keyboard up y =%f",self.kHeight);
        frame.origin.y -= self.kHeight;
        textInputView.frame = frame;

        frame = bubbleTable.frame;
        frame.size.height -= self.kHeight;
        bubbleTable.frame = frame;
    }];

它正在运行，但您注意到UIview不像Facebook或viber应用程序那样平稳移动。所以我想问一下这是什么常见方法。非常感谢你！

Answer 1

在滚动视图中嵌入您的视图（如果您使用的是Interface Builder，只需单击您的视图，然后从顶部菜单中选择Editor-＆gt; Embed In-＆gt; Scroll View。以下是一些示例代码：

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

    // Flip kbSize if landscape.
    if (UIInterfaceOrientationIsLandscape([[UIDevice currentDevice] orientation])) {
        kbSize = CGSizeMake(kbSize.height, kbSize.width);
    }

    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 1.0);
    [scrollView setContentInset:contentInsets];
    [scrollView setScrollIndicatorInsets:contentInsets];

    CGPoint scrollPoint = CGPointMake(0.0, [bubbleTable frame].origin.y - kbSize.height);
    [scrollView setContentOffset:scrollPoint animated:YES];
}

Answer 2

Swift 3

您可以随时移动任何视图或UIKit对象，通过引用其约束（即使用Outlet）

@IBOutlet weak var someViewBottomConstraint: NSLayoutConstraint!

然后，在viewWillLayoutSubviews（）

中注册通知

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()

    NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow), name: .UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide), name: .UIKeyboardWillHide, object: nil)
}

完成后，您需要在viewWillLayoutSubviews（）中调用2种方法

func keyboardWillShow(_ notification: NSNotification) {
    let keyboardSize: CGSize = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue.size
    let height = min(keyboardSize.height, keyboardSize.width)
    someViewBottomConstraint.constant = height // you can add a value to the height to move it up/down.
    self.view.layoutIfNeeded() // this will auto animate the view motion with the keyboard

}

func keyboardWillHide() {
    someViewBottomConstraint.constant = 0 
    self.view.layoutIfNeeded()
}

Answer 3

尝试此动画（使用选项进行实验）：

[UIView animateWithDuration:duration
                          delay:0
                        options:UIViewAnimationOptionAllowUserInteraction|UIViewAnimationOptionBeginFromCurrentState
                     animations:^{
                         //your animation
                     }
                     completion:nil];

如何用键盘移动textview和tableview？

3 个答案: