点击手势一个UITextView的一部分

Question

我有这样的代码：

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

这将反应到整个UITextView的，但有可能改变它，使它只响应字符串时的某一部分在UITextView被挖掘？就像一个URL例如？

Answer 1

您不能在正常的UITextView中将轻敲手势分配给特定的字符串。你可以设置UITextView的dataDetectorTypes。

textview.dataDetectorTypes = UIDataDetectorTypeAll; 

如果你想只检测URL，可以分配到，

textview.dataDetectorTypes = UIDataDetectorTypeLink; 

检查文档以更多的细节：UIKit DataTypes Reference。还要检查这个Documentation on UITextView

更新：

基于您的评论，检查是这样的：

- (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this，用途：

- (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]; 
} 

您可以用粒度这种尝试如UITextGranularitySentence，UITextGranularityLine等。检查documentation在这里。