IOS 按日期时间排序键值

Question

我是 IOS 开发的新手。我想按 NSDate 对 NSMutable 字典进行排序，但无法成功。以下是我的代码:

- (void)handleSelectedAssets:(NSMutableDictionary *)selectedAssets {

    NSMutableArray *UUIDs = [NSMutableArray array];
    assetCount = 0;
    NSMutableDictionary *yourMutableDictionary = [[NSMutableDictionary alloc] init];
    for (NSString *key in selectedAssets) {
        NSURL *assetURL = [selectedAssets objectForKey:key];

        ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc] init];
        [assetslibrary assetForURL:assetURL
                       resultBlock:^(ALAsset *asset) {
                           NSString *UUID = [self getUUID];
                           UploadAsset *ua = [[[UploadAsset alloc] initWithAssetURL:assetURL] autorelease];

                           ua.delegate = self;
                           ua.UUID = UUID;
                           ua.uploadURL = self.uploadURL;
                           ua.chunkSize = chunkSize;
                           ua.qualityPercent = qualityPercent;

                           [self.uploads addObject:ua];

                           //[self.uploadAssets setObject:assetURL forKey:UUID];

                           [UUIDs addObject:UUID];

                           NSDate *myDate = [asset valueForProperty:ALAssetPropertyDate];

                           [yourMutableDictionary setObject:UUID forKey:myDate]; // want to sort this dictionary by key.


                           assetCount++;
                           if ([selectedAssets count] == assetCount) {
// After sorting, I want to assign all value to below sendSelectedUUIDs.

                              // NSLog(@"Sort %@",sValues);
                               [self sendSelectedUUIDs:UUIDs];
                               //[self startUploaderQueue];
                               [self handleUploads:ALAssetTypePhoto];
                               [self handleUploads:ALAssetTypeVideo];
                           }
                       } failureBlock:^(NSError *error) {
                           NSLog(@"ALAssetsLibrary Error");
                       }];
    }


}

Answer 1

试试这个....

-(NSMutableArray *)sortByDate:(NSMutableArray *)array objectforKey:(NSString *)key ascending:(BOOL)asc{

    NSSortDescriptor *sortDescriptor;
    sortDescriptor=[[NSSortDescriptor alloc]initWithKey:key ascending:asc];
    NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
    NSArray *sortedArray;
    sortedArray = [array sortedArrayUsingDescriptors:sortDescriptors];
    return [[NSMutableArray alloc]initWithArray:sortedArray];
}