ios – 更改inputAccessoryView问题的高度

当我更改iOS 8中inputAccessoryView的高度时,inputAccessoryView不会转到正确的位置,而是覆盖键盘.

以下是一些代码段：

在表视图控制器中

- (UIView *)inputAccessoryView {
    if (!_commentInputView) {
        _commentInputView = [[CommentInputView alloc] initWithFrame:CGRectMake(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UIView类别从ios-helpers

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

解决方法

最后,我找到了答案.在ios8中,apple将一个NSContentSizeLayoutConstraints添加到inputAccessoryView并设置一个常数为44.不能删除这个constaint,因为ios8用它来计算inputAccessoryView的高度.所以,唯一的解决办法是改变这个常数的价值.

例

在ViewDidAppear

- (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,更改inputAccessoryView的高度

- (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];
    }];
}

那是.