在 iOS 的 UITextView 中检测属性文本的点击 [英] Detecting taps on attributed text in a UITextView in iOS

问题描述

我有一个显示 NSAttributedString 的 UITextView.该字符串包含我希望使其可点击的单词，这样当他们被点击时，我会被回调，以便我可以执行操作.我意识到 UITextView 可以检测 URL 上的点击并回调我的委托，但这些不是 URL.

I have a UITextView which displays an NSAttributedString. This string contains words that I'd like to make tappable, such that when they are tapped I get called back so that I can perform an action. I realise that UITextView can detect taps on a URL and call back my delegate, but these aren't URLs.

在我看来，借助 iOS 7 和 TextKit 的强大功能，这现在应该是可能的，但是我找不到任何示例，我不知道从哪里开始.

It seems to me that with iOS 7 and the power of TextKit this should now be possible, however I can't find any examples and I'm not sure where to start.

我知道现在可以在字符串中创建自定义属性(尽管我还没有这样做)，也许这些对于检测是否已点击其中一个魔术词很有用?无论如何，我仍然不知道如何拦截该点击并检测点击发生在哪个单词上.

I understand that it's now possible to create custom attributes in the string (although I haven't done this yet), and perhaps these will be useful to detecting if one of the magic words has been tapped? In any case, I still don't know how to intercept that tap and detect on which word the tap occurred.

请注意，不需要兼容 iOS 6.

Note that iOS 6 compatibility is not required.

推荐答案

我只是想帮助别人多一点.根据 Shmidt 的回答，可以完全按照我在原始问题中的要求进行操作.

I just wanted to help others a little more. Following on from Shmidt's response it's possible to do exactly as I had asked in my original question.

1) 创建一个属性字符串，并将自定义属性应用于可点击的单词.例如.

1) Create an attributed string with custom attributes applied to the clickable words. eg.

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

2) 创建一个 UITextView 来显示该字符串，并向其中添加一个 UITapGestureRecognizer.然后处理水龙头:

2) Create a UITextView to display that string, and add a UITapGestureRecognizer to it. Then handle the tap:

- (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);

    }
}

知道怎么做就这么简单！

So easy when you know how!

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