iOS 显示键盘时的 UITableView contentOffset

Question

我正在尝试在出现 keyboard 时设置 tableView 的 contentOffset。实际代码在 CustomTableView : UITableView <UIScrollViewDelegate> 中，因为它在整个应用程序中被广泛使用，因此使用 self 作为 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，当用户点击靠近 tableView 顶部的 tableCell 时，它总是将内容偏移键盘的高度，这是错误的。理想情况下，我想偏移内容，使点击的 tableCell 刚好在键盘上方。问题是我不知道该怎么做。我有一个粗略的想法，我需要这样的东西：

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

关于我如何得出这些数字有什么建议吗？或者有更好的解决方案吗？

稍后编辑：

我无法使用 contentInset，因为 tableView 有 sectionHeaders，设置 contentInset 会导致 sectionHeaders 保持修复，而rows 向上移动。

解决方案 基于以下建议：

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

我认为将键盘高度也添加到 edgeInset 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;
}];

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