ios - 不是按字母顺序而是使用字符串前缀参数对数组进行排序

Question

初始数组

{
    "Golf > Short game > Ballflight / Target",
    "Mental > I do (behavior/skills - how) > Energy / Emotions",
    "Fitness > Endurance",
    "Fitness > Flexibility",
    "Golf > Long game",
    "Golf > Long game > Approach from fairway",
    "Golf > Practice Game",
}

我想对上面的数组进行排序，从 golf 、 fitness 和 mental 开始。
所以结果数组如下所示

{
    "Golf > Short game > Ballflight / Target",
    "Golf > Long game",
    "Golf > Long game > Approach from fairway",
    "Golf > Practice Game",
    "Fitness > Endurance",
    "Fitness > Flexibility",
    "Mental > I do (behavior/skills - how) > Energy / Emotions",
}

请指导我。

我尝试使用 for 循环，但我想要一些简单的解决方案来解析它。

谢谢。

Answer 1

示例代码(根据行首词排序):

NSMutableArray *myArray = [@[
    @"Golf > Short game > Ballflight / Target",
    @"Mental > I do (behavior/skills - how) > Energy / Emotions",
    @"Fitness > Endurance",
    @"Fitness > Flexibility",
    @"Golf > Long game",
    @"Golf > Long game > Approach from fairway",
    @"Golf > Practice Game",
    ] mutableCopy];

NSDictionary *scores = @{@"Golf":@1, @"Fitness":@2, @"Mental":@3};

[myArray sortUsingComparator:^NSComparisonResult(NSString *str1, NSString *str2) {

    // first word (can be refined checking for better word break chars)
    NSString *prefix1;
    NSRange rangeUntilSpace1 = [str1 rangeOfString:@" "];
    if (rangeUntilSpace1.location != NSNotFound)
        prefix1 = [str1 substringToIndex:rangeUntilSpace1.location];
    else
        prefix1 = str1;

    NSString *prefix2;
    NSRange rangeUntilSpace2 = [str2 rangeOfString:@" "];
    if (rangeUntilSpace2.location != NSNotFound)
        prefix2 = [str2 substringToIndex:rangeUntilSpace2.location];
    else
        prefix2 = str2;

    // scores (taken from the previous dictionary)
    NSInteger score1 = [scores[prefix1] intValue];
    NSInteger score2 = [scores[prefix2] intValue];

    if (score1 && score2) {

        return score1 > score2 ? NSOrderedDescending : NSOrderedAscending;
    } else if (score1) {

        return NSOrderedAscending;  // if not in scores dictionary, put down
    } else {

        return NSOrderedDescending; // if not in scores dictionary, put down
    }

}];