检测iOS中UITextView中属性文本的抽头

Question

我知道现在可以在字符串中创建自定义属性了（尽管我还没有这样做），也许这些属性对于检测是否有一个神奇的单词被点击是有用的？无论如何，我仍然不知道如何拦截那个窃听，并检测到窃听发生在哪个单词上。

请注意，不需要iOS6兼容性。

Answer 1

我只是想多帮助别人一点。根据Shmidt的回答，可以完全按照我在最初问题中提出的要求来做。

1）创建一个属性化字符串，该字符串具有应用于可点击单词的自定义属性。

NSAttributedString* attributedString = [[NSAttributedString alloc] initWithString:@"a clickable word" attributes:@{ @"myCustomTag" : @(YES) }];
[paragraph appendAttributedString:attributedString];

2）创建UITextView以显示字符串，并向其添加UITapGestureRecognizer。然后处理轻击：

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

    // Location of the tap in text-container coordinates

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

    // Find the character that's been tapped on

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

    if (characterIndex < textView.textStorage.length) {

        NSRange range;
        id value = [textView.attributedText attribute:@"myCustomTag" atIndex:characterIndex effectiveRange:&range];

        // Handle as required...

        NSLog(@"%@, %d, %d", value, range.location, range.length);

    }
}