问题描述
我一直在寻找高低，无法弄清楚如何做到这一点。假设我有一个这样的字符串：
I've been searching high and low and can't figure out how to do this. Lets say I have a string like this:
NSString *string = @"&foo !foo";
我要做的是区分文本中的两个foos（听起来很有趣哈哈）视图。当我点击一个时，我想知道它前面有哪个（&或！）。以下是我的说法：
What I'm trying to do is differentiate between the two foos (sounds funny haha) inside a text view. When I click on one, I want to know which (& or !) comes before it. Here's how I'm getting the word:
UITapGestureRecognizer *recognizer = (UITapGestureRecognizer *)sender;
UITextView *TV = (UITextView*)recognizer.view;
CGPoint location = [recognizer locationInView:TV];
location.y += TV.contentOffset.y;
UITextPosition *tapPosition = [TV closestPositionToPoint:CGPointMake(location.x, location.y)];
UITextRange *textRange = [TV.tokenizer rangeEnclosingPosition:tapPosition
withGranularity:UITextGranularityWord inDirection:UITextLayoutDirectionRight];
NSString *tappedWord = [TV textInRange:textRange];
我无法弄清楚如何获得前一个角色。 TV.tokenizer UITextGranularityCharacter 只获取最接近的字母，而不是符号。对此的任何解决方案？
I can't figure out how to get the previous character. TV.tokenizer UITextGranularityCharacter only gets the closest letter, not the symbol. Any solutions for this?
推荐答案
检查：，将 UITextRange 转换为 NSRange （我将打电话给 selectedRange ）。
Check: Convert selectedTextRange UITextRange to NSRange to convert your UITextRange to a NSRange (that I'll call selectedRange).
用我之前对链接问题的回答激励我，您需要在代码末尾添加此内容：
Inspiring me with the previous answer to the linked question, you'd need to add this at the end of your code:
UITextPosition *beginning = TV.beginningOfDocument;
UITextPosition *selectionStart = textRange.start;
UITextPosition *selectionEnd = textRange.end;
NSInteger location = [TV offsetFromPosition:beginning toPosition:selectionStart];
NSInteger length = [TV offsetFromPosition:selectionStart toPosition:selectionEnd];
NSRange selectedRange = NSMakeRange(location,lenght);
NSRange range = NSMakeRange(selectedRange.location-1,1) //Maybe need to check if selectedRange.location>0
NSString *yourCharString = [[TV text] substringWithRange:range];
这篇关于使用UITextPosition，从textInRange获取前一个字符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！