打开键盘时向上滚动tableView

Question

我有一个带有一些自定义单元格的 UITable，在最后一个单元格上我有一个 UITextField，我希望所有单元格在打开键盘时都会向上滚动（所有类型的键盘，启用和禁用“预测” )。

我已经查看了有关此主题的其他问题并尝试了，但仍然不够好（单元格与键盘之间存在间隙，tableView 的动画与键盘不同步等...)。

你能帮帮我吗？

谢谢！

Answer 1

查看Github 上的 iOS Firechat 示例项目。它使用 tableView 外部的文本字段，并在视图出现/消失时随键盘一起移动视图。

特别是本节：

// Setup keyboard handlers to slide the view containing the table view and
// text field upwards when the keyboard shows, and downwards when it hides.
- (void)keyboardWillShow:(NSNotification*)notification
{
    [self moveView:[notification userInfo] up:YES];
}

- (void)keyboardWillHide:(NSNotification*)notification
{
    [self moveView:[notification userInfo] up:NO];
}

- (void)moveView:(NSDictionary*)userInfo up:(BOOL)up
{
    CGRect keyboardEndFrame;
    [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey]
     getValue:&keyboardEndFrame];

    UIViewAnimationCurve animationCurve;
    [[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey]
     getValue:&animationCurve];

    NSTimeInterval animationDuration;
    [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey]
     getValue:&animationDuration];

    // Get the correct keyboard size to we slide the right amount.
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:animationDuration];
    [UIView setAnimationCurve:animationCurve];

    CGRect keyboardFrame = [self.view convertRect:keyboardEndFrame toView:nil];
    int y = keyboardFrame.size.height * (up ? -1 : 1);
    self.view.frame = CGRectOffset(self.view.frame, 0, y);

    [UIView commitAnimations];
}

在 Swift 中也是如此，未经测试：

func moveView(userInfo : NSDictionary, up : Bool){

        var keyboardEndFrame : CGRect?
        userInfo.objectForKey(UIKeyboardFrameEndUserInfoKey)?.getValue(&keyboardEndFrame)

        var animationCurve : UIViewAnimationCurve?
        userInfo.objectForKey(UIKeyboardAnimationCurveUserInfoKey)?.getValue(&animationCurve)

        var animationDuration : NSTimeInterval?
        userInfo.objectForKey(UIKeyboardAnimationDurationUserInfoKey)?.getValue(&animationDuration)

        UIView.beginAnimations(nil, context: nil)
        UIView.setAnimationBeginsFromCurrentState(true)
        UIView.setAnimationDuration(animationDuration!)
        UIView.setAnimationCurve(animationCurve!)

        let keyboardFrame = self.view.convertRect(keyboardEndFrame!, toView: nil)

        let y = keyboardFrame.size.height * (up ? -1 : 1);
        self.view.frame = CGRectOffset(self.view.frame, 0, y);

        UIView.commitAnimations()
    }