如何在 ios 的 NSMutableArray 中对时间进行排序

Question

我在 NSMutableArray 中有一组字典。现在我想按时间升序和降序排序这是我的数组值。

(
    {
    StartTime = "09:00 AM";
    TravelsName = "ABC Travels";
},
    {
    StartTime = "07:30 AM";
    TravelsName = "XYZ Travels ";
},
    {
    StartTime = "06:45 PM";
    TravelsName = "GSP  Travels";
},
    {
    StartTime = "05:00 PM";
    TravelsName = "Madura  Travels";
},
    {
    StartTime = "12:45 AM";
    TravelsName = "MJT Travels";
},
    {
    StartTime = "12:45 PM";
    TravelsName = "OPR Travels";
},
    {
    StartTime = "01:00 AM";
    TravelsName = "VMS Travels";
}
)

请帮助我，我已经对 NSMutableArray 中的 NSDate 集进行了排序 通过下面的代码

//To sort the Time Array
dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"hh:mm a"];

    NSMutableArray *dates = [NSMutableArray arrayWithCapacity:times.count];

    for (NSString *timeString in times)
    {
        NSDate *date = [dateFormatter dateFromString:timeString];
        [dates addObject:date];
    }
    [dates sortUsingSelector:@selector(compare:)];

    NSMutableArray *sortedTimes = [NSMutableArray arrayWithCapacity:dates.count];
    for (NSDate *date in dates)
    {
        NSString *timeString = [dateFormatter stringFromDate:date];
        [sortedTimes addObject:timeString];
    }

但我不知道如何对 NSMutableArray 中的字典进行排序帮助我。

Answer 1

最好使用NSArray中已经提供的排序方法。应该这样做：

NSArray *stortedArray = [unsortedArray sortedArrayUsingComparator:^NSComparisonResult(NSDictionary *_Nonnull obj1, NSDictionary *_Nonnull obj2) {
        return [obj1[@"StartTime"] compare:obj2[@"StartTime"]];
}];

或者如果StartTime 仍然是一个字符串：

NSArray *stortedArray = [unsortedArray sortedArrayUsingComparator:^NSComparisonResult(NSDictionary *_Nonnull obj1, NSDictionary *_Nonnull obj2) {
    return [[dateFormatter dateFromString:obj1[@"StartTime"]] compare:[dateFormatter dateFromString:obj2[@"StartTime"]]];
}];

要更改升序/降序，您只需在块中使用 obj1 和 obj2 即可：

return [obj2[@"StartTime"] compare:obj1[@"StartTime"]];