之前做的项目有需要对文件进行按时间顺序排序,并按每一天分组，完成类似下面效果，具体demo ，里面有详细注释，如下

image.png

排序过后可以得到类似的数组
(
        (
                {
            NSFileCreationDate = "2017-12-06 06:00:38 +0000";
            NSFileSize = 8901;
            Name = "20171206140036.mp4";
        },
                {
            NSFileCreationDate = "2017-12-06 06:00:33 +0000";
            NSFileSize = 9332;
            Name = "20171206140031.mp4";
        }
    ),
        (
                {
            NSFileCreationDate = "2017-12-05 08:08:43 +0000";
            NSFileSize = 26326;
            Name = "20171205160833.mp4";
        },
                {
            NSFileCreationDate = "2017-12-05 07:59:57 +0000";
            NSFileSize = 11546;
            Name = "20171205155953.mp4";
        },
                {
            NSFileCreationDate = "2017-12-05 07:54:30 +0000";
            NSFileSize = 62277;
            Name = "20171205155416.mp4";
        }
    )
)

// 这个获取沙盒相关路径，就是你文件存储的路径
+ (NSString *)getVideoPath {
    NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *getPath = [docPath stringByAppendingPathComponent:@"Videos"];
    
    [[NSFileManager defaultManager] createDirectoryAtPath:getPath withIntermediateDirectories:YES attributes:nil error:nil];
    return getPath;
}
/**
 输入文件路径，得到排序好的相关数组，可以设置升序或降序

 @param path 文件列表路径
 @param isascending 是否升序
 @return 排序好的数组
 */
+ (NSMutableArray *)visitDirectoryList:(NSString *)path Isascending:(BOOL)isascending {
    NSArray *fileList  = [[NSFileManager defaultManager] subpathsAtPath:path];  // 取得目录下所有文件列表
    fileList = [fileList sortedArrayUsingComparator:^(NSString *firFile, NSString *secFile) {  // 将文件列表排序
        NSString *firPath = [path stringByAppendingPathComponent:firFile];  // 获取前一个文件完整路径
        NSString *secPath = [path stringByAppendingPathComponent:secFile];  // 获取后一个文件完整路径
        NSDictionary *firFileInfo = [[NSFileManager defaultManager] attributesOfItemAtPath:firPath error:nil];  // 获取前一个文件信息
        NSDictionary *secFileInfo = [[NSFileManager defaultManager] attributesOfItemAtPath:secPath error:nil];  // 获取后一个文件信息
        id firData = [firFileInfo objectForKey:NSFileCreationDate];  // 获取前一个文件创建时间
        id secData = [secFileInfo objectForKey:NSFileCreationDate];  // 获取后一个文件创建时间
        
        if (isascending) {
            return [firData compare:secData];  // 升序
        } else {
            return [secData compare:firData];  // 降序
        }
        
    }];
    
    //______________________________________________________________________________________________________
    // 将所有文件按照日期分成数组
    
    NSMutableArray  *listArray = [NSMutableArray new];//最终数组
    NSMutableArray  *tempArray = [NSMutableArray new];//每天文件数组
    NSDateFormatter *format    = [[NSDateFormatter alloc] init];
    format.dateFormat = @"yyyy-MM-dd";
    
    for (NSString *fileName in fileList) {
        NSString     *filePath = [path stringByAppendingPathComponent:fileName];
        NSDictionary *fileInfo = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:nil];  // 获取文件信息
        
        NSMutableDictionary *fileDic = [NSMutableDictionary new];
        fileDic[@"Name"] = fileName;//文件名字
        fileDic[NSFileSize] = fileInfo[NSFileSize];//文件大小
        fileDic[NSFileCreationDate] = fileInfo[NSFileCreationDate];//时间
        
        if (tempArray.count > 0) {  // 获取日期进行比较, 按照 XXXX 年 XX 月 XX 日来装数组
            NSString *currDate = [format stringFromDate:fileInfo[NSFileCreationDate]];
            NSString *lastDate = [format stringFromDate:tempArray.lastObject[NSFileCreationDate]];
            
            if (![currDate isEqualToString:lastDate]) {
                [listArray addObject:tempArray];
                tempArray = [NSMutableArray new];
            }
        }
        [tempArray addObject:fileDic];
    }
    
    if (tempArray.count > 0) {  // 装载最后一个 array 数组
        [listArray addObject:tempArray];
    }
    
    NSLog(@"visitDirectoryList = %@", listArray);
    return listArray;
}