ios - 设置后 UITextView 属性文本为空

Question

我有一个带有不可编辑、不可选择的 UITextView 的自定义 UICollectionViewCell。在 cellForItemAtIndexPath: 方法中，我设置了 UITextView 的 attributedText 属性，它可以很好地显示所有属性。但是，当我稍后尝试访问该属性文本时(在点击手势识别器的操作方法中)，该值为空。

这是我的代码:

View Controller :

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
     TNCommentCollectionViewCell *commentCell = [collectionView dequeueReusableCellWithReuseIdentifier:kCommentCellIdentifier 
                                                                                          forIndexPath:indexPath];

     TNComment *comment = [self.comments objectAtIndex:indexPath.row];
     commentCell.textView.attributedText = [self commentStringForComment:comment];

     return commentCell;
}

- (NSAttributedString *)commentStringForComment:(DAFeedComment *)comment
{
    NSString *usernameString = [NSString stringWithFormat:@"@%@", comment.username];
    NSDictionary *usernameAttributes = @{ NSForegroundColorAttributeName : [UIColor usernameColor],
          NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Light" size:14.0f] };
    NSAttributedString *attributedUsernameString = [[NSAttributedString alloc] initWithString:usernameString attributes:usernameAttributes];
    NSMutableAttributedString *labelString = [attributedUsernameString mutableCopy];

    NSDictionary *commentAttributes = @{ NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Light" size:14.0f] };
    [labelString appendAttributedString:[[NSAttributedString alloc] initWithString:@" "]];
    [labelString appendAttributedString:[[NSAttributedString alloc] initWithString:comment.comment attributes:commentAttributes]];

    return labelString;
}

Collection View 单元格:

- (void)awakeFromNib
{
    [super awakeFromNib];

    self.textView.textContainerInset = UIEdgeInsetsZero;

    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(textViewTapped:)];
    tapGesture.numberOfTapsRequired = 1;
    [self.textView addGestureRecognizer:tapGesture];
}

- (void)textViewTapped:(UITapGestureRecognizer *)recognizer
{
    UITextView *textView = (UITextView *)recognizer.view;

    NSLayoutManager *layoutManager = textView.layoutManager;
    CGPoint location = [recognizer locationInView:textView];
    location.x -= textView.textContainerInset.left;
    location.y -= textView.textContainerInset.top;

    NSUInteger characterIndex = [layoutManager characterIndexForPoint:location
                                                      inTextContainer:textView.textContainer
                             fractionOfDistanceBetweenInsertionPoints:nil];

    if( characterIndex < textView.textStorage.length )
    {
        NSLog(@"%@", textView.attributedText);
    }
}

这导致输出只是“(null)”。但是，如果我打印 UITextView 的文本属性，它将打印实际文本，而不是属性文本。

我做错了什么吗？非常感谢任何帮助

谢谢!

Answer 1

我遇到了同样的问题。我的解决方案是在 Storyboard中启用 UITextView 可选属性。之后一切正常。

希望对你有帮助