对于我正在编写的iCloud插件，我将我的iCloud管理器类订阅到这些iCloudNSMetaDataQuery观察者://AddapredicateforfindingthedocumentsNSString*filePattern=[NSStringstringWithFormat:@"*.%@",@"*"];self.metadataQuery=[[NSMetadataQueryalloc]init];//Beforestartingtoquery,itisrequiredtosetthesearchscope.arrayWithObject:NSMetadataQueryUb