UITextField获取当前编辑的单词 [英] UITextField get currently edited word

问题描述

我正在开发一个自动完成组件，我有一个问题需要以一种简单的方式解决。

I'm working on an autocompletion component and I have one problem that I would like to solve in some easy way.

我想支持对自动填充文本进行编辑，例如：

I want to support edits to autocompleted text, for example:

 blablabl @usertag blablabl

如果用户返回并编辑@usertag字符串，我想在编辑时启动自动完成功能。

If user goes back and edits @usertag string, I would like to start autocompletion when it's edited.

问题是，如何从textfield获取当前编辑的单词。我考虑过采用光标位置，将nsstring分隔为单词（空格）并计算从第一个单词到光标位置的字母。

Question is, how to get currently edited word from textfield. I thought about taking cursor position, seperate nsstring to word by " " (space) and count letters from first word to cursor position.

有没有更简单的方法可以做到这一点？

Is there any easier way for doing that?

推荐答案

好的，我找到了一种方便的方法。也许有人会发现它很有用：

Ok I found a way to do it quite easily. Maybe someone will find it useful:

UITextRange* selectedRange = [textField selectedTextRange];
NSInteger cursorOffset = [textField offsetFromPosition:0 toPosition:selectedRange.start];
NSString* text = textField.text;
NSString* substring = [text substringToIndex:cursorOffset];
NSString* editedWord = [[substring componentsSeparatedByString:@" "] lastObject];

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