Objective c 筛选NSFileManager内容以获取文件列表'；模式'；使用NSPredicate

我有一个字符串数组用作“过滤器”：

@[@"*.png", @".DS_Store", @"Foobar", @".jpg"]

如何使用上述模式使用NSPredicate过滤掉文件夹中的所有内容

到目前为止，我得到的是：

NSArray *contents = [fileManager contentsOfDirectoryAtPath:fullPath error:NULL];
NSArray *filter = @[@"*.png", @".DS_Store", @"Foobar", @".jpg"];
NSArray *contents = [contents filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"((pathExtension IN[cd] %@) OR (lastPathComponent IN[cd] %@)) ", filter, filter]];

---

但这并没有给我想要的结果。例如，不过滤

png

文件。此外，我无法使其不区分大小写，因此不会过滤掉

foobar

。

您可以过滤那些您想要列出的内容。剩余的将自动过滤

-(void)filter
{
    localSongs=[[NSMutableArray alloc]init];
    NSArray * paths = NSSearchPathForDirectoriesInDomains ( NSDocumentDirectory,  NSUserDomainMask, YES);
    documentsDirectory = [paths objectAtIndex:0];
    NSDirectoryEnumerator *de = [[NSFileManager defaultManager]   enumeratorAtPath:documentsDirectory] ;
    NSString *file;

    while ((file = [de nextObject]))
    if (([[file pathExtension] isEqualToString:@"MP3"]) || ([[file  pathExtension]isEqualToString:@"mp4"]) ||  ([[file pathExtension]isEqualToString:@"mp3"]) ||  ([[file pathExtension]isEqualToString:@"mov"]) || ([[file  pathExtension]isEqualToString:@"avi"]) )

    [localSongs addObject:file.lastPathComponent];


    NSLog(@"local files%@",localSongs);
}

---

您可以筛选要列出的内容。剩余的将自动过滤

-(void)filter
{
    localSongs=[[NSMutableArray alloc]init];
    NSArray * paths = NSSearchPathForDirectoriesInDomains ( NSDocumentDirectory,  NSUserDomainMask, YES);
    documentsDirectory = [paths objectAtIndex:0];
    NSDirectoryEnumerator *de = [[NSFileManager defaultManager]   enumeratorAtPath:documentsDirectory] ;
    NSString *file;

    while ((file = [de nextObject]))
    if (([[file pathExtension] isEqualToString:@"MP3"]) || ([[file  pathExtension]isEqualToString:@"mp4"]) ||  ([[file pathExtension]isEqualToString:@"mp3"]) ||  ([[file pathExtension]isEqualToString:@"mov"]) || ([[file  pathExtension]isEqualToString:@"avi"]) )

    [localSongs addObject:file.lastPathComponent];


    NSLog(@"local files%@",localSongs);
}

看看

看看