检测文本字段中的位置和变化 [英] detect where and what changes within textfield

问题描述

如何检查我的 textfieldDidChange 方法中字符串的更改内容和位置?

How can I check what exactly and where a string changed in my textfieldDidChange method?

let str1 = "Hello how are you @Marie, nice day uh?"

假设我的用户决定编辑文本和链接 markus 而不是 marie

So imagine my user decides to edit the text and link markus instead of marie

let str2 = "Hello how are you @ Markus, nice day uh?"

我需要一种方法来检测文本字段中@Markus 的变化，但不会改变字符串中的任何其他内容.我能够检测到最后一个词，第一个词等等，但重要的是还要查看文本中的变化

I need a method that detect the change of @ Markus in the text field but doesn't change anything else in the string. I am able to detect last word, first word and so one, but its important to also see what changed within the text

我正在考虑一种方法

a = "Hello how are you"
b = newly changed text field
c = ", nice day uh?"

let str3 = a + b + c // More or less 

也许我得到了我正在编辑的索引，在这个索引中取出单词——从左边的空格到右边的空格——然后把它剪掉?提前致谢，是的，我是初学者:P

Maybe that I get the index where I am editing at, taking the word out at this index - from left space to right space - and cutting it out? Thanks in advance, yes I am a beginner :P

推荐答案

您可以使用此代码拆分字符串.

You can split your string using this code.

对于目标 c :

1.创建这样的函数.

 -(NSString *)checkString:(NSString *)splitString{

            NSRange firstObj = [splitString rangeOfString:@"@"];
            NSRange secondObject = [splitString rangeOfString:@","];
            NSRange rangeSubStr = NSMakeRange(firstObj.location + firstObj.length, secondObject.location - firstObj.location - firstObj.length);
            return [splitString substringWithRange:rangeSubStr];
 }

2.像这样使用这个功能.

[self checkString:@"Hello how are you @Marie, nice day uh?"]

然后文本的每一个变化，你都可以检查子字符串，并将它们与原始子字符串进行比较.

Then every change in text, you can check substrings, and compare them to original substrings.

这篇关于检测文本字段中的位置和变化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IT屋！