Application tried to push a nil view controller on target - ios

Question

I am creating an app without storyboards and I am having trouble moving from when a user clicks on a table view cell to the detail view of that cell.
in the class where I create and handle the table view I have the following code:
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
PersonDetailViewController *detailViewController;
Person *person = [self.playerArray objectAtIndex:indexPath.row];
detailViewController.person = person;
[[self navigationController] pushViewController:detailViewController animated:YES];
}
So I am trying to push a detail view controller on to the screen and then display the user info on that detail screen. I have tried to find a solution to this but, most of the answers I have come across use storyboards, and I am not using storyboards.
in my PersonDetailViewController.m class I have the following code:
#import "PersonDetailViewController.h"
#interface PersonDetailViewController ()
#end
#implementation PersonDetailViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.personInfo = [[UITextField alloc] initWithFrame:CGRectMake(45, 30, 200, 40)];
_personInfo.backgroundColor = [UIColor whiteColor];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
#end
I am not sure if this may be a cause for the issue but in my delegate I have the following:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];
self.tableViewController = [[TableViewController alloc]init];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self.tableViewController];
self.window.rootViewController = nav;
[self.window makeKeyAndVisible];
return YES;
}
I was thinking that maybe it has something to do with creating the navigation controller but I was playing around with it and I do not think it does.

Answer 1

You missed the initialization of the view controller in the tableView:didSelectRowAtIndexPath: method
PersonDetailViewController *detailViewController = [[PersonDetailViewController alloc] init]; // or initWith...