从NSObject传递NSMutableArray到ViewController时出错

Question

我在NSObject类中有一个MutableArray我想将NSMutableArray传递给detailViewController然后我想在tableView（detailViewController）中显示NSMutableArray。在这个项目中我有一个两个视图控制器，一个是firstViewcontroller和detailviewcontroller。问题是数据无法从NSObject传递。如果您想要更多信息请给我一个想法请问。

peripheralmanager.m

- (void)centralManager:(CBCentralManager *)central 
didDiscoverPeripheral:(CBPeripheral *)peripheral 
 advertisementData:(NSDictionary *)advertisementData 
              RSSI:(NSNumber *)RSSI
{

  NSLog(@"didDiscoverPeriphera.peripheral: %@ rssi: %@, UUID:%@ advertisementData:%@", peripheral,RSSI,peripheral.UUID, [advertisementData description]);

  targetPeripheral = peripheral;
  peripheral.delegate = self;
  //  [[centralManager retrievePeripherals:NSArray arrayWithObject:(id)peripheral.UUID] ];
  //  rssilabel.text=[RSSI stringValue];
  if (!peripheral.isConnected)
  {
  [centralManager connectPeripheral:peripheral options:nil];
  }
  // MeBleAppDelegate *appdelegate=(MeBleAppDelegate *)[[UIApplication sharedApplication]delegate];
  MeBleDetailViewController *obj=[[MeBleDetailViewController alloc]init];
  // MeBleDetailViewController *obj=[[appdelegate sharedappdelegate].navigationController objectATindex:MeBleDetailViewController];
  obj.dataArray=self.mutableArray;
  [self.mutableArray addObject:peripheral];
  printf("New UUId,addin\r\n");

}

detailviewcontroller.m

- (void)viewDidLoad
{
  //NSMutableArray *dataArray=[[NSMutableArray alloc]init];
  [super viewDidLoad];
  NSLog(@"%@",self.dataArray);
  NSLog(@"%@",objCurrentDevice.mutableArray);
  //  PeripheralManager *peripheralmanager=[[PeripheralManager alloc]init];
  self.label.text=[NSString stringWithFormat:@" %@ ",dataArray];
  // Do any additional setup after loading the view.
  // [self.dataArray addObject:objCurrentDevice.mutableArray];

  appDelegate.arrDevices=dataArray;
  appDelegate = [[UIApplication sharedApplication] delegate]; 
  // write below line in any function in this file
  // NSLog(@"%d",[appDelegate.arrDevices count]);  
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  static NSString *simpleTableIdentifier=@"Cell1";

  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
  if(cell==nil)
  {
    cell =[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}

    cell.textLabel.text=[dataArray objectAtIndex:indexPath.row];
     //  PeripheralManager *objtemp=[[dataArray objectAtIndex:indexPath.row]deviceName];
     NSLog(@"%@",objCurrentDevice.deviceName);
    return cell;
}

错误消息

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '***    -[__NSArrayM insertObject:atIndex:]: object cannot be nil'

*** First throw call stack:

(0x356c888f 0x37a6f259 0x3561d1d7 0x164db 0x33135c8b 0x331421e9 0x33142059 0x33141f3f 0x331417c1 0x33141503 0x33135aff 0x331357d5 0x331ae903 0x33228627 0x351e2933 0x3569ca33 0x3569c699 0x3569b26f 0x3561e4a5 0x3561e36d 0x372ba439 0x3312acd5 0x1500f 0x14fb4)

terminate called throwing an exception(lldb) 

我想要输出这样的图像..请给出一个想法。请向我询问更多信息。

Answer 1

您可以使用指定的初始值程序来解决此问题

在 FirstViewController

中

-(id)initwithData (NSArray*)array
{
  //store the data in array
}

在DetailedViewController中，您可以调用此方法..

MeBleDetailViewController *obj=[[MeBleDetailViewController alloc]initwithData:yournsarrayname];

您可以看到您的数组将加载数据

Answer 2

我认为您没有阅读异常消息：

-[__NSArrayM insertObject:atIndex:]: object cannot be nil'

此异常与传递数组无关，它与填充数组的方式有关。 Cocoa集合类不能保存nil指针（如果你想要这样的话，请参阅NSNull）并且你试图将nil指针放入数组中，它正在异常（字面意思） ）。

添加一些保护代码：

obj.dataArray=self.mutableArray;
if (peripheral != nil)
    [self.mutableArray addObject:peripheral];