呼叫完成處理方法在循環

Question

我有一個數組中的FB用戶的相冊，我想獲取每個相冊的圖像，我必須調用下面的方法與albumId， 但我無法在For循環中調用此方法，我希望所有的專輯圖片，問題是，循環執行，而無需調用「FBRequestConnection startWithGraphPath：graphPath」功能，所以我沒有得到響應 問題是完成處理程序請告訴我如何調用方法與完成處理for循環

arrAlbumIds=(11523252,11523245,11523278) 

for (int i=0; i<arrAlbumIds.count; i++) { 



     NSString * graphPath=[NSString stringWithFormat:@"/%@/photos",[arrAlbumIds objectAtIndex:i]]; 

     [FBRequestConnection startWithGraphPath:graphPath 
            parameters:nil 
            HTTPMethod:@"GET" 
           completionHandler:^(
                FBRequestConnection *connection, 
                id result, 
                NSError *error 
               ) { 
            /* handle the result */ 

            NSLog(@"album images:%@",result); 

            FBGraphObject * response=[[FBGraphObject alloc]init]; 
            response=result; 

            NSMutableDictionary * dictImagesData=[[NSMutableDictionary alloc]init]; 
            dictImagesData=response; 


            NSMutableArray * arrImagesData=[[NSMutableArray alloc]init]; 
            arrImagesData=[dictImagesData valueForKey:@"data"]; 


            FBGraphObject * fbGraphImages=[[FBGraphObject alloc]init]; 
            fbGraphImages=[arrImagesData valueForKey:@"images"]; 

            NSDictionary * dictImages=[[NSDictionary alloc]init]; 
            dictImages=fbGraphImages; 

            NSMutableArray * arrImages=[[NSMutableArray alloc]init]; 
            arrImages=[arrImagesData valueForKey:@"images"]; 



            //Get Url of Each Image 
            //self.arrFbAlbumImages=[[NSMutableArray alloc]init]; 

            [arrFacebookAlbumThumbnail addObject:[arrImages valueForKey:@"source"]]; 

            NSLog(@"arrFacebookAlbumThumbnail=%@",arrFacebookAlbumThumbnail); 
           }]; 
} 

Answer 1

從您的意見，它看起來像Facebook API不喜歡併發操作。

此代碼消除了for循環，並調用完成處理程序

int i=0; 

if (arrAlbumIds.count > 1) 
{ 


    NSString * graphPath=[NSString stringWithFormat:@"/%@/photos",[arrAlbumIds objectAtIndex:i]]; 

    void (^completionBlock)(FBRequestConnection *connection,id result,NSError *error)= ^(FBRequestConnection *connection, 
         id result, 
         NSError *error) { 
    NSLog(@"album images:%@",result); 

    FBGraphObject * response=[[FBGraphObject alloc]init]; 
    response=result; 

    NSMutableDictionary * dictImagesData=[[NSMutableDictionary alloc]init]; 
    dictImagesData=response; 


    NSMutableArray * arrImagesData=[[NSMutableArray alloc]init]; 
    arrImagesData=[dictImagesData valueForKey:@"data"]; 


    FBGraphObject * fbGraphImages=[[FBGraphObject alloc]init]; 
    fbGraphImages=[arrImagesData valueForKey:@"images"]; 

    NSDictionary * dictImages=[[NSDictionary alloc]init]; 
    dictImages=fbGraphImages; 

    NSMutableArray * arrImages=[[NSMutableArray alloc]init]; 
    arrImages=[arrImagesData valueForKey:@"images"]; 


    //Get Url of Each Image 
    //self.arrFbAlbumImages=[[NSMutableArray alloc]init]; 

    [arrFacebookAlbumThumbnail addObject:[arrImages valueForKey:@"source"]]; 

    NSLog(@"arrFacebookAlbumThumbnail=%@",arrFacebookAlbumThumbnail); 

    if (++i<arrAlbumIds.count) { 
     NSString * graphPath=[NSString stringWithFormat:@"/%@/photos",[arrAlbumIds objectAtIndex:i]]; 
    [FBRequestConnection startWithGraphPath:graphPath 
            parameters:nil 
            HTTPMethod:@"GET" 
           completionHandler:completionBlock]; 
    } 
    }; 

    [FBRequestConnection startWithGraphPath:graphPath 
            parameters:nil 
            HTTPMethod:@"GET" 
           completionHandler:completionBlock]; 

}