ios - 更改 inputAccessoryView 问题的高度

Question

当我在 iOS 8 中更改 inputAccessoryView 的高度时，inputAccessoryView 没有转到正确的原点，而是覆盖了键盘。

下面是一些代码片段:

在 TableView Controller 中

- (UIView *)inputAccessoryView {
    if (!_commentInputView) {
        _commentInputView = [[CommentInputView alloc] initWithFrame:CGRectMake(0, 0, [self width], 41)];
        [_commentInputView setPlaceholder:NSLocalizedString(@"Comment", nil) andButtonTitle:NSLocalizedString(@"Send", nil)];
        [_commentInputView setBackgroundColor:[UIColor whiteColor]];
        _commentInputView.hidden = YES;
        _commentInputView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleBottomMargin;
    }

    return _commentInputView;
}

在 CommentInputView 中

#when the textview change height
- (void)growingTextView:(HPGrowingTextView *)growingTextView willChangeHeight:(float)height {
    if (height > _textView_height) {
        [self setHeight:(CGRectGetHeight(self.frame) + height - _textView_height)];
        [self reloadInputViews];
    }
}

在来自 ios-helpers 的 UIView 类别中

- (void)setHeight: (CGFloat)heigth {
    CGRect frame = self.frame;
    frame.size.height = heigth;
    self.frame = frame;
}

Answer 1

终于，我找到了答案。在ios8中，apple给inputAccessoryView增加了一个NSContentSizeLayoutConstraints，并设置了一个常量44。你不能去掉这个constant，因为ios8用它来计算inputAccessoryView的高度。因此，唯一的解决方案是更改此常量的值。

例子

在ViewDidAppear中

- (void)viewDidAppear:(BOOL)animated {
    if ([self.inputAccessoryView constraints].count > 0) {
        NSLayoutConstraint *constraint = [[self.inputAccessoryView constraints] objectAtIndex:0];
        constraint.constant = CommentInputViewBeginHeight;
    }
}

当textview高度改变时改变inputAccessoryView高度

- (void)growingTextView:(HPGrowingTextView *)growingTextView willChangeHeight:(float)height {

    NSLayoutConstraint *constraint = [[self constraints] objectAtIndex:0];
    float new_height = height + _textView_vertical_gap*2;

    [UIView animateWithDuration:0.2 animations:^{
        constraint.constant = new_height;
    } completion:^(BOOL finished) {
        [self setHeight:new_height];
        [self reloadInputViews];
    }];
}

也就是。