拆分 NSString 并限制响应 [英] Split NSString and Limit the response

问题描述

我有一个字符串 Hello-World-Test，我只想用第一个破折号分割这个字符串.

I have a string Hello-World-Test, I want to split this string by the first dash only.

字符串 1:你好字符串 2:世界测试

String 1:Hello String 2:World-Test

这样做的最佳方法是什么?我现在正在做的是使用 componentsSeparatedByString，获取数组中的第一个对象并将其设置为字符串 1，然后使用字符串 1 的长度作为起始索引执行子字符串.

What is the best way to do this? What I am doing right now is use componentsSeparatedByString, get the first object in the array and set it as String 1 then perform substring using the length of String 1 as the start index.

谢谢！

推荐答案

我在 NSString 上添加了一个类别，以便在给定字符串的第一次出现时进行拆分.以数组形式返回结果可能并不理想，但除此之外似乎还可以.它只是使用了 NSString 方法 rangeOfString:，它接受一个 NSString(B) 并返回一个 NSRange 显示在哪里该字符串(B)位于.

I added a category on NSString to split on the first occurrence of a given string. It may not be ideal to return the results in an array, but otherwise it seems fine. It just uses the NSString method rangeOfString:, which takes an NSString(B) and returns an NSRange showing where that string(B) is located.

@interface NSString (Split)

- (NSArray *)stringsBySplittingOnString:(NSString *)splitString;

@end

@implementation NSString (Split)

- (NSArray *)stringsBySplittingOnString:(NSString *)splitString
{
    NSRange range = [self rangeOfString:splitString];
    if (range.location == NSNotFound) {
        return nil;
    } else {
        NSLog(@"%li",range.location);
        NSLog(@"%li",range.length);
        NSString *string1 = [self substringToIndex:range.location];
        NSString *string2 = [self substringFromIndex:range.location+range.length];
        NSLog(@"String1 = %@",string1);
        NSLog(@"String2 = %@",string2);
        return @[string1, string2];
    }
}

@end

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