iCloud和NSFileWrapper:在"设置"中显示为2个不同的文件

Question

我有一个使用基于NSFileWrapper的UIDocument的应用程序.我的文件包装器是一个名为"XXX.cp"的目录,有两个子文件"photo.data"和"photo.metadata".它似乎可以保存和加载文档,但是当我转到Settings\Manage Storage\Unknown时,子文件会单独列出:

我期待它显示"XXX.cp"而不是这两个子文件.我想我已经正确设置并导出文件UTI:

我认为我正在创建文件包装器(特别是因为它读/写正常):

- (void)encodeObject:(id<NSCoding>)object toWrappers:(NSMutableDictionary *)wrappers preferredFilename:(NSString *)preferredFilename {    
    @autoreleasepool {                
        NSMutableData * data = [NSMutableData data];    
        NSKeyedArchiver * archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];    
        [archiver encodeObject:object forKey:@"data"];    
        [archiver finishEncoding];   
        NSFileWrapper * wrapper = [[NSFileWrapper alloc] initRegularFileWithContents:data];    
        [wrappers setObject:wrapper forKey:preferredFilename];    
    }    
}        

- (id)contentsForType:(NSString *)typeName error:(NSError *__autoreleasing *)outError {        
    if (self.captionedPhotoMetadata == nil || self.captionedPhoto == nil) {    
        *outError = [[NSError alloc] initWithDomain:CaptionedPhotoErrorDomain code:CaptionedPhotoInvalidDocument userInfo:[NSDictionary dictionaryWithObjectsAndKeys:NSLocalizedString(@"Invalid document!", @""), NSLocalizedDescriptionKey, nil]];    
        return nil;        
    }    
    NSMutableDictionary * wrappers = [NSMutableDictionary dictionary];    
    [self encodeObject:self.captionedPhotoMetadata toWrappers:wrappers preferredFilename:METADATA_FILENAME];    
    [self encodeObject:self.captionedPhoto toWrappers:wrappers preferredFilename:DATA_FILENAME];       
    NSFileWrapper * fileWrapper = [[NSFileWrapper alloc] initDirectoryWithFileWrappers:wrappers];    
    return fileWrapper;        
}

但仍然没有雪茄.谁知道问题是什么？谢谢!

Answer 1

想通了这一点。问题是你需要有 3 个字母的文件扩展名。我的只有 2 个字母：“.cp”。我将其切换为“.cap”并且它起作用了：P