点击手势到UITextView的一部分 [英] Tap gesture to part of a UITextView

问题描述

我有这段代码：

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapResponse)];
singleTap.numberOfTapsRequired = 1;
[_textView addGestureRecognizer:singleTap];

这将对整个UITextView作出反应，但是是否可以更改它以便它只响应当点击UITextView中字符串的某个部分时？比如一个URL？

This will react to the entire UITextView, but is it possible to change it so that it only responds to when a certain part of the string in the UITextView is tapped? Like a URL for example?

推荐答案

您无法在普通的UITextView中为特定字符串分配点击手势。您可以为UITextView设置dataDetectorTypes。

You cannot assign tap gesture to particular string in normal UITextView. You can probably set the dataDetectorTypes for UITextView.

textview.dataDetectorTypes = UIDataDetectorTypeAll;

如果您只想检测网址，可以分配给，

If you want to detect only urls, you can assign to,

textview.dataDetectorTypes = UIDataDetectorTypeLink;

查看文档以获取更多详细信息： UIKit DataTypes Reference 。另请检查 UITextView上的文档

Check the documentation for more details on this: UIKit DataTypes Reference. Also check this Documentation on UITextView

更新：

根据你的评论，检查如下：

Based on your comment, check like this:

- (void)tapResponse:(UITapGestureRecognizer *)recognizer
{
     CGPoint location = [recognizer locationInView:_textView];
     NSLog(@"Tap Gesture Coordinates: %.2f %.2f", location.x, location.y);
     NSString *tappedSentence = [self lineAtPosition:CGPointMake(location.x, location.y)];
     //use your logic to find out whether tapped Sentence is url and then open in webview
}

从这个，使用：

- (NSString *)lineAtPosition:(CGPoint)position
{
    //eliminate scroll offset
    position.y += _textView.contentOffset.y;
    //get location in text from textposition at point
    UITextPosition *tapPosition = [_textView closestPositionToPoint:position];
    //fetch the word at this position (or nil, if not available)
    UITextRange *textRange = [_textView.tokenizer rangeEnclosingPosition:tapPosition withGranularity:UITextGranularitySentence inDirection:UITextLayoutDirectionRight];
    return [_textView textInRange:textRange];
}

您可以尝试使用粒度，例如UITextGranularitySentence，UITextGranularityLine等。检查文档这里。

You can try with granularities such as, UITextGranularitySentence, UITextGranularityLine etc.. Check the documentation here.

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