lets say that you have receiveData and receiveData2 are in ViewController called NextViewController,
then we can do like this,
NextViewController *nextViewController = [[NextViewController alloc] initWithNibName:@"NextViewController" bundle:nil];
[nextViewController setReceivedData: sendData1];
[nextViewController setReceivedData2: sendData2];
[self presentViewController:NextViewController animated:YES completion:nil];
also change nonatomic,assign to nonatomic strong
@property(nonatomic,strong) NSMutableData *receivedData;
@property(nonatomic,strong) NSMutableData *receivedData2;