objective-c - 按修改日期降序获取文件夹顺序中的文件列表

Question

我需要获取按创建日期降序排序的数组中的文件列表，即最近修改的文件位于顶部。我使用 NSFileManager 检查了一些内置选项。有可用的开箱即用选项吗？

NSArray *filePathsArray =
[[NSFileManager defaultManager] subpathsOfDirectoryAtPath:documentsDirectory error:nil];

Answer 1

参见this ，也许会有帮助

//This is reusable method which takes folder path and returns sorted file list
-(NSArray*)getSortedFilesFromFolder: (NSString*)folderPath
{
    NSError *error = nil;
    NSArray* filesArray = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:folderPath error:&error];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF EndsWith '.pdf'"];//Take only pdf file
    filesArray =  [filesArray filteredArrayUsingPredicate:predicate];

    // sort by creation date
    NSMutableArray* filesAndProperties = [NSMutableArray arrayWithCapacity:[filesArray count]];

    for(NSString* file in filesArray) {

        if (![file isEqualToString:@".DS_Store"]) {
            NSString* filePath = [folderPath stringByAppendingPathComponent:file];
            NSDictionary* properties = [[NSFileManager defaultManager]
                                        attributesOfItemAtPath:filePath
                                        error:&error];
            NSDate* modDate = [properties objectForKey:NSFileModificationDate];

            [filesAndProperties addObject:[NSDictionary dictionaryWithObjectsAndKeys:
                                           file, @"path",
                                           modDate, @"lastModDate",
                                           nil]];

        }
    }

    // Sort using a block - order inverted as we want latest date first
    NSArray* sortedFiles = [filesAndProperties sortedArrayUsingComparator:
                            ^(id path1, id path2)
                            {
                                // compare
                                NSComparisonResult comp = [[path1 objectForKey:@"lastModDate"] compare:
                                                           [path2 objectForKey:@"lastModDate"]];
                                // invert ordering
                                if (comp == NSOrderedDescending) {
                                    comp = NSOrderedAscending;
                                }
                                else if(comp == NSOrderedAscending){
                                    comp = NSOrderedDescending;
                                }
                                return comp;
                            }];

    return sortedFiles;

}