在ViewDidLoad之後NSMutableArray爲空

在tableView中加載的數據是我的描述。在ViewDidLoad之後NSMutableArray爲空

我想從API中添加對象，它以JSON形式將數據反饋到NSMutableArray，但它不會使用tableview加載。
我可以看到數組設置好，但它不會加載到tableview，直到我嘗試滾動tableview。

這是非常煩人的，無法弄清楚爲什麼善意幫我弄清楚。

這裏是我的代碼 -

- (void)viewDidLoad { 

    [SVProgressHUD showWithStatus:@"Please wait ..."]; 


    //get the bookings 
    [self getBookings]; 

    [super viewDidLoad]; 

    [self.tableView reloadData]; 
}

-(void) getBookings 
{ 
    [email protected]"41"; 
    bookingsList=[[NSMutableArray alloc] init]; 

    NSString *urlAsString = [NSString stringWithFormat:@"http://www.webservice.com/cleaning/api/booking/show/%@/%d",uid,0]; 
    NSURL *url = [[NSURL alloc] initWithString:urlAsString]; 
    NSLog(@"%@", urlAsString); 

    [NSURLConnection sendAsynchronousRequest:[[NSURLRequest alloc] initWithURL:url] queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) { 

     if (error) { 

      NSLog(@"URL Session Task Failed: %@", [error localizedDescription]); 
     } 
     else { 

      NSArray *postsFromResponse = [NSJSONSerialization JSONObjectWithData: data options:NSJSONReadingMutableContainers error:nil]; 

      NSLog(@"Count %d", postsFromResponse.count); 

      NSLog(@"JSON: %@", postsFromResponse); 

      //remove all objects from array 
      [self.bookingsList removeAllObjects]; 

      for (NSDictionary *attributes in postsFromResponse) { 
       booking *bk = [[booking alloc] init]; 
       [bk setAddress:[attributes objectForKey:@"Address"]]; 
       [bk setBookingId:[attributes objectForKey:@"BookingID"]]; 
       [bk setServiceDate:[attributes objectForKey:@"ServiceDate"]]; 
       [bk setClientName:[attributes objectForKey:@"ClientName"]]; 
       [bk setStatus:[attributes objectForKey:@"Status"]]; 
       [bk setServiceTime:[attributes objectForKey:@"ServiceTime"]]; 
       [bk setPrice:[attributes objectForKey:@"Price"]]; 
       [bk setCleanType:[attributes objectForKey:@"CleanType"]]; 
       [bk setNumOfHours:[attributes objectForKey:@"NumOfHours"]]; 

       //add to array 
       [self.bookingsList addObject:bk]; 

      } 
      NSLog(@"Records found -%lu",(unsigned long)[bookingsList count]); 
      [self.tableView reloadData]; 
      if(bookingsList.count==0) 
      { 
       UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:@"No Data Alert!" 
                    message:@"No bookings found!" delegate:nil 
                  cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
       //[alertView show]; 
       [alertView performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:YES]; 
      } 

     } 
    }]; 


    [SVProgressHUD dismiss]; 


}

#pragma mark - TableView Delegate Methods 
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 
    return 1; 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 

    NSLog(@"Total rows - %lu", (unsigned long)[self.bookingsList count]); 
    return [self.bookingsList count]; 
}

來源

2016-08-19 Tajuddin

首先，您是否成功獲得服務器的響應？ – user3182143

是的，我確實得到了迴應，並顯示了JSON數據。正如我所說，它顯示當我嘗試滾動tableview。 – Tajuddin

使用這個它會幫助你

- (void)viewDidLoad { 

    [SVProgressHUD showWithStatus:@"Please wait ..."]; 


    //get the bookings 
    [self getBookings]; 

    [super viewDidLoad]; 
} 

-(void) getBookings 
{ 

    [email protected]"41"; 

    bookingsList=[[NSMutableArray alloc] init]; 

    NSString *urlAsString = [NSString stringWithFormat:@"http://www.webservice.com/cleaning/api/booking/show/%@/%d",uid,0]; 
    NSURL *url = [[NSURL alloc] initWithString:urlAsString]; 
    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:urlAsString]; 
    [request setHTTPMethod:GET_REQUEST]; 
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; 
    NSURLSession *session = [NSURLSession sharedSession]; 
    NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *err) 
            { 

             if (error) { 

              NSLog(@"URL Session Task Failed: %@", [error localizedDescription]); 
             } 
             else { 

              NSArray *postsFromResponse = [NSJSONSerialization JSONObjectWithData: data options:NSJSONReadingMutableContainers error:nil]; 

              NSLog(@"Count %d", postsFromResponse.count); 

              NSLog(@"JSON: %@", postsFromResponse); 

              //remove all objects from array 
              [self.bookingsList removeAllObjects]; 

              for (NSDictionary *attributes in postsFromResponse) { 
               booking *bk = [[booking alloc] init]; 
               [bk setAddress:[attributes objectForKey:@"Address"]]; 
               [bk setBookingId:[attributes objectForKey:@"BookingID"]]; 
               [bk setServiceDate:[attributes objectForKey:@"ServiceDate"]]; 
               [bk setClientName:[attributes objectForKey:@"ClientName"]]; 
               [bk setStatus:[attributes objectForKey:@"Status"]]; 
               [bk setServiceTime:[attributes objectForKey:@"ServiceTime"]]; 
               [bk setPrice:[attributes objectForKey:@"Price"]]; 
               [bk setCleanType:[attributes objectForKey:@"CleanType"]]; 
               [bk setNumOfHours:[attributes objectForKey:@"NumOfHours"]]; 

               //add to array 
               [self.bookingsList addObject:bk]; 

              } 
              NSLog(@"Records found -%lu",(unsigned long)[bookingsList count]); 
              dispatch_async(dispatch_get_main_queue(),^{ 
               [self.tableView reloadData]; 
              }); 
              if(bookingsList.count==0) 
              { 
               UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:@"No Data Alert!" 
                            message:@"No bookings found!" delegate:nil 
                         cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
               //[alertView show]; 
               [alertView performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:YES]; 
              } 

             } 
            }]; 
    [task resume]; 


    [SVProgressHUD dismiss]; 


} 


- (void)didReceiveMemoryWarning { 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 

#pragma mark - Table view data source 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 

    return 1; 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 

    NSLog(@"Total rows - %lu", (unsigned long)[self.bookingsList count]); 
    return [self.bookingsList count]; 
}

來源

2016-08-19 07:30:55 PinkeshGjr

感謝您的建議，dispatch_async（dispatch_get_main_queue（），^ {self.tableView reloadData]; }）;似乎解決了這個問題。我必須替換[request setHTTPMethod：GET_REQUEST];與request.HTTPMethod = @「GET」; – Tajuddin

編碼約定：背雜物任何屬性都應該以下劃線開頭。像_bookingsList一樣。如果你沒有遵循這個連接，我們就不知道沒有完整的源代碼，在bookingsList的任務中將存儲結果。

來源

2016-08-19 07:42:45 gnasher729

在ViewDidLoad之後NSMutableArray爲空

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