Objective c 如何获取两个字符串的第一个不同范围

我有两个字符串，如下所示：

NSString *path1 = @"/Users/user/Desktop/AAA/BBB/1.txt";
NSString *path2 = @"/Users/user/Document/test/AAA/CCC/2.txt";

现在，我想为两个字符串获取第一个不同的字符串：path1的“Desktop”和path2的“Document/test”。如果有两个以上的NSString呢

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有什么算法可以实现这一点吗？

试试这样的方法

-(NSString *)findDiferentIn:(NSArray *)first By:(NSArray *)second{

    for (int i = 0; i < [first count]; i++) {
        if (![second objectAtIndex:i]) {
            return [first objectAtIndex:i];
        }else{
            if (![[first objectAtIndex:i] isEqualToString:[second objectAtIndex:i]]) {
                return [first objectAtIndex:i];
            }
        }
    }

    return @"";
}

NSString *path1 = @"/Users/user/Desktop/AAA/BBB/1.txt";
NSString *path2 = @"/Users/user/Document/test/AAA/CCC/2.txt";

NSLog(@"diferent in first string: %@", [self findDiferentIn:[path1 componentsSeparatedByString:@"/"] By:[path2 componentsSeparatedByString:@"/"]]);
NSLog(@"diferent in second string: %@", [self findDiferentIn:[path2 componentsSeparatedByString:@"/"] By:[path1 componentsSeparatedByString:@"/"]]);