ios - 显示键盘时，iOS UITableView contentOffset

Question

我尝试在显示contentOffset时设置tableView的keyboard。实际的代码位于CustomTableView : UITableView <UIScrollViewDelegate>内部，因为它在整个应用程序中得到了广泛使用，因此将self用作tableView。
我的代码如下所示:

- (void)keyboadDidAppear:(NSNotification *)notification {
    NSTimeInterval animationDuration = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    CGRect keyboardBeginFrame = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
    CGFloat keyboardHeight = CGRectGetHeight(keyboardBeginFrame);
    CGPoint contentOffset = self.contentOffset;
    originalContentOffset = self.contentOffset;//hold reference to reset it when keyboard is hidden
    contentOffset.y += keyboardHeight;
    [UIView animateWithDuration:animationDuration animations:^{
        [self layoutIfNeeded];
    } completion:^(BOOL finished) {
        if (finished) {
            [self setContentOffset:contentOffset animated:YES];
        }
    }];
}

问题在于，它总是使内容偏移键盘的高度，这在用户点击靠近 tableCell顶部的 tableView时是错误的。
理想情况下，我想偏移内容，以便轻按的 tableCell位于键盘上方。
问题是我不知道该怎么做。我有一个大概的想法，我需要这样的东西:

distanceBetweenTappedCellAndTableBottom > keyboardHeight ? do nothing : offsetContentBy keyboardHeight + tappedCellHeight.

关于如何得出这些数字的任何建议？还是有更好的解决方案？

以后编辑:

我无法使用 contentInset，因为 tableView具有 sectionHeaders，并且设置 contentInset会使 sectionHeaders保持固定，而 rows向上移动。

基于以下建议的解决方案:

CGSize kbSize = [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    NSTimeInterval duration = [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    CGFloat height = UIDeviceOrientationIsPortrait([[UIDevice currentDevice] orientation]) ? kbSize.width : kbSize.height;

    height += 10.0;//it needs to be slightly higher so the textField is clearly visible.
    originalEdgeInset = self.contentInset;
    __weak typeof (self) block = self;
    [UIView animateWithDuration:duration animations:^{
        UIEdgeInsets edgeInsets = block.contentInset;
        edgeInsets.bottom += height;
        block.contentInset = edgeInsets;
        edgeInsets = block.scrollIndicatorInsets;
        edgeInsets.bottom += height;
        block.scrollIndicatorInsets = edgeInsets;
    }];

Answer 1

我认为当您将键盘高度也添加到edgeInset中时，键盘不会移动

  CGSize kbSize = [[[sender userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
NSTimeInterval duration = [[[sender userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

CGFloat height = UIDeviceOrientationIsPortrait([[UIDevice currentDevice] orientation]) ? kbSize.width : kbSize.height;

[UIView animateWithDuration:duration animations:^{
    UIEdgeInsets edgeInsets = _generalTableView.contentInset;
    edgeInsets.bottom += height;
    _generalTableView.contentInset = edgeInsets;
    edgeInsets = _generalTableView.scrollIndicatorInsets;
    edgeInsets.bottom += height;
    _generalTableView.scrollIndicatorInsets = edgeInsets;
}];