更改inputAccessoryView问题的高度

问题描述

当我在iOS 8中更改 inputAccessoryView 的高度时，inputAccessoryView不会转到右侧原点，而是覆盖键盘。

When I change the height of inputAccessoryView in iOS 8, the inputAccessoryView not go to the right origin, but covers the keyboard.

以下是一些代码段：

- (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;
}

CommentInputView中的

in CommentInputView

#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];
    }
}

来自

in UIView Category from ios-helpers

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

推荐答案

最后，我找到了答案。在ios8中，apple将一个NSContentSizeLayoutConstraints添加到inputAccessoryView并设置一个常量为44.你不能删除这个constaint，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。

Finally, i found the answer. In ios8, apple add a NSContentSizeLayoutConstraints to inputAccessoryView and set a constant with 44. You can't remove this constaint, because ios8 use it to calculate the height of inputAccessoryView. So, the only solution is to change value of this constant.

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

在textview高度改变时更改inputAccessoryView高度

change inputAccessoryView height when the textview height changed

- (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];
    }];
}

即是。

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