按升序排序多维 NSMutableArray Objective - C

Question

我正在尝试使用键 @"Channel" 按升序对这个 NSMutableArray（带有字典对象）进行排序（有多个频道条目，为了便于阅读，我只是缩短了它）：

我尝试使用以下方式进行排序：

NSSortDescriptor *channelDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"Channel" ascending:YES selector:@selector(compare:)];
NSArray *descriptors = @[channelDescriptor];
[self.tempArrayDuplicateDataForAppWatch sortUsingDescriptors:descriptors];

数据：

{
    Airings =     (
                {
            AiringTime = "2015-08-24T19:00:00Z";
            AiringType = Unknown;
            CC = 1;
            Category = Movie;
            Color = Color;
            DSS = 0;
            DVS = 0;
            Dolby = 0;
            Duration = 120;
            HD = 0;
            HDLevel = "HD Level Unknown";
            LetterBox = 0;
            MovieRating = R;
            ProgramId = 20306212;
            SAP = 0;
            Sports = 0;
            Stereo = 1;
            Subcategory = horror;
            TVRating = "TV-MA";
            Title = Chernobyl;
        }
    );
    CallLetters = Syfy;
    Channel = 151;
    ChannelImages =     (
                {
            AspectRatio = "109:79";
            ImageCaption = "Source logo";
            ImageCredit = Syfy;
            ImageCreditDisplay = false;
            ImageExpiryDateTime = "<null>";
            ImageFormat = jpg;
            ImageFormatId = 144;
            ImageHorizontalResolution = 720;
            ImageId = 74975320;
            ImageOwner = Syfy;
            ImageTitle = Syfy;
            ImageType = "Station Logo";
            ImageUrl = ;
            ImageVerticalResolution = 521;
            LastUpdate = "2014-07-11T22:05:13Z";
            ObjectId = 1232;
            ObjectName = "Syfy (East)";
            ObjectType = Source;
            ParentImageId = 16795667;
        }
    );
    ChannelSchedules =     (
    );
    DisplayName = Syfy;
    IconAvailable = 0;
    IsChannelOverride = 0;
    Order = 1510647;
    ParentNetworkId = 0;
    ServiceId = 82368;
    SourceAttributeTypes = "";
    SourceAttributes = 0;
    SourceId = 1232;
    SourceLongName = "Syfy (East)";
    SourceType = Basic;
    Type = "24-Hours";
},
{
    Airings =     (
                {
            AiringTime = "2015-08-24T19:00:00Z";
            AiringType = Repeat;
            CC = 1;
            Category = Other;
            Color = Color;
            DSS = 0;
            DVS = 0;
            Dolby = 0;
            Duration = 30;
            HD = 0;
            HDLevel = "HD Level Unknown";
            LetterBox = 0;
            ProgramId = 26463608;
            SAP = 0;
            SeriesId = 24828094;
            Sports = 0;
            Stereo = 1;
            Subcategory = "game show";
            TVRating = None;
            Title = "Celebrity Game";
        },
                {
            AiringTime = "2015-08-24T19:30:00Z";
            AiringType = Repeat;
            CC = 1;
            Category = Other;
            Color = Color;
            DSS = 0;
            DVS = 0;
            Dolby = 0;
            Duration = 30;
            HD = 0;
            HDLevel = "HD Level Unknown";
            LetterBox = 0;
            ProgramId = 26332661;
            SAP = 0;
            SeriesId = 24828094;
            Sports = 0;
            Stereo = 1;
            Subcategory = "game show";
            TVRating = None;
            Title = "Celebrity Game";
        },
                {
            AiringTime = "2015-08-24T20:00:00Z";
            AiringType = Repeat;
            CC = 1;
            Category = Other;
            Color = Color;
            DSS = 0;
            DVS = 0;
            Dolby = 0;
            Duration = 30;
            HD = 0;
            HDLevel = "HD Level Unknown";
            LetterBox = 0;
            ProgramId = 1055967;
            SAP = 0;
            Sports = 0;
            Stereo = 0;
            Subcategory = "game show";
            TVRating = "TV-PG";
            Title = "Family Feud";
        },
                {
            AiringTime = "2015-08-24T20:30:00Z";
            AiringType = Repeat;
            CC = 1;
            Category = Other;
            Color = Color;
            DSS = 0;
            DVS = 0;
            Dolby = 0;
            Duration = 30;
            HD = 0;
            HDLevel = "HD Level Unknown";
            LetterBox = 0;
            ProgramId = 1055967;
            SAP = 0;
            Sports = 0;
            Stereo = 0;
            Subcategory = "game show";
            TVRating = "TV-PG";
            Title = "Family Feud";
        }
    );
    CallLetters = WDAF;
    Channel = 4;
    ChannelImages =     (
                {
            AspectRatio = "23:9";
            ImageCaption = "92x36;darklight";
            ImageCreditDisplay = false;
            ImageExpiryDateTime = "<null>";
            ImageFormat = jpg;
            ImageFormatId = 97;
            ImageHorizontalResolution = 800;
            ImageId = 4065300;
            ImageTitle = FOX;
            ImageType = "Station Logo";
            ImageUrl = ;
            ImageVerticalResolution = 313;
            LastUpdate = "2015-06-22T16:50:52Z";
            ObjectId = 134;
            ObjectName = WDAF;
            ObjectType = Source;
            ParentImageId = 16814381;
        }
    );
    ChannelSchedules =     (
    );
    DisplayName = WDAF;
    IconAvailable = 1;
    IsChannelOverride = 0;
    Order = 40002;
    ParentNetworkId = 3;
    ServiceId = 82368;
    SourceAttributeTypes = "";
    SourceAttributes = 0;
    SourceId = 134;
    SourceLongName = WDAF;
    SourceType = Broadcast;
    Type = "24-Hours";
}

我意识到 @"Channel" 值是字符串格式，我不能使用 "compare:" 我想知道是否有更好的方法。非常感谢您的帮助！

Answer 1

对于具有键值的字典的 NSArray 的排序数组如下。

brandDescriptor = [[NSSortDescriptor alloc] initWithKey:@"Channel" ascending:YES];
sortDescriptors = [NSArray arrayWithObject:brandDescriptor];
sortedArray = [myArray sortedArrayUsingDescriptors:sortDescriptors];

我从 https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/SortDescriptors/Articles/Creating.html#//apple_ref/doc/uid/20001845-BAJEAIEE. Also, https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/KeyValueCoding/Articles/KeyValueCoding.html 中提取的代码开始发挥作用，因为 sortedArrayUsingDescriptors: 将发送一个 valueForKey: 到 myArray 中的每个元素，然后使用标准比较器对返回值。

Answer 2

再次感谢您的帮助和建议。我终于弄明白了为什么 NSSortDescriptor 不起作用。 @"Channel" 的值是一个字符串，因此排序无法正常工作。我不得不从 NSMutableArray 中逐一提取每个 Dictionary，并将 @"Channel" 的值更改为 NSNumber/NSDecimalNumber，然后将旧字符串值替换为新值。然后我用 NSSortDescriptor 排序，它起作用了。

示例代码如下：

for (int i=0; i<[unsortedNSMutableArray count]; i++)
    {
        NSMutableDictionary *tempChannelInfo = [[NSMutableDictionary alloc] init];
        tempChannelInfo = unsortedNSMutableArray[i];
        NSString *tempChannelString = tempChannelInfo[@"Channel"];
        NSNumber *convertedChannel = [NSDecimalNumber decimalNumberWithString:tempChannelString];
        [tempChannelInfo setObject:convertedChannel forKey:@"Channel"];
        [unsortedNSMutableArray replaceObjectAtIndex:i withObject:tempChannelInfo];
    }

然后我排序：

NSSortDescriptor *channelDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"Channel" ascending:YES selector:@selector(compare:)];
    NSArray *descriptors = @[channelDescriptor];
    [unsortedNSMutableArray sortUsingDescriptors:descriptors];

再次感谢您的帮助和建议！

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