CODEWITHSUNDEEP
iosobjective-cuistoryboardsegueipad
user2535467
user2535467

Reputation:

master detail app crashes instantly when using push segue

First of all, if this is, somehow, a dup post, feel free to point me to the correct one because I have not found it after hours of searching.

I am using a MasterDetail viewController in my app, which for the first week or so of development, had no additional ViewVontrollers or segues other than the default. I wrote my main code, and the Master and Detail viewController are working perfectly. As soon as I added another VC with a push segue from the Detail View, my app crashes instantly. This is the error :

***Terminating app due to uncaught exception 'NSInvalidArgumentException', reason '-[UINavigationController setPlayer:]: unrecognized selector sent to instance ...' and then a bunch of hex.

In the AppDelegate.m, if I comment out this line:

rightViewController.delegate = rightViewController

Then the app will start up and the push segue will work, but now, obviously, if I were to select a cell in the MasterView, it would crash giving this error:

***Terminating app due to uncaught exception 'NSInvalidArgumentException', reason '-[UINavigationController selectedPlayer:]: unrecognized selector sent to instance ...' and then a bunch of hex.

Here is all of the code that I think is relevant:

AppDelegate.m

#import "AppDelegate.h"
#import "LeftViewController.h"
#import "RightViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    UISplitViewController *splitViewController = (UISplitViewController *)self.window.rootViewController;
    UINavigationController *leftNavController = [splitViewController.viewControllers objectAtIndex:0];
    LeftViewController *leftViewController = (LeftViewController *)[leftNavController topViewController];
    RightViewController *rightViewController = [splitViewController.viewControllers objectAtIndex:1];

    Player *selectedPlayer = [[leftViewController preclears]objectAtIndex:0];
    [rightViewController setPlayer:selectedPlayer];

    leftViewController.delegate = rightViewController;
    return YES;
}

- (void)applicationWillTerminate:(UIApplication *)application
{
    // Called when the application is about to terminate. Save data if appropriate.   See also applicationDidEnterBackground:.
}

@end

LeftViewController.m (part)

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

    [tableView deselectRowAtIndexPath:indexPath animated:YES];

    //Re-fetch the feed from the Postgres Database when a user selects an entry

    [JSONHTTPClient getJSONFromURLWithString:@"http://myurl" completion:^(NSDictionary *json, JSONModelError *err) {
    NSError* error = nil;
    _feed = [[PostgresFeed alloc] initWithDictionary:json error:&error];

    //Print the data fethced to NSLog in JSON format

    [[NSNotificationCenter defaultCenter] postNotificationName:@"myNotification" object:nil userInfo:[[json objectForKey:@"player"] objectAtIndex:indexPath.row]];

}];

Player *selectedPlayer = [_players objectAtIndex:indexPath.row];

if (_delegate) 
    {
        [_delegate selectedPlayer:selectedPlayer];
    }
}

So, I am doing something wrong, but I can not figure out what it is. I have done a lot of googling and have not found an answer yet. In case someone wants to know, I am new to iOS and Obj C, and the MasterDetail app was based off of the Ray Wenderlich tutorial for iPad SplitViews. I have also checked out some of the Scott Sherwood tutorials on segues, but have not found any answers there.

Let me know if any more code is needed.

Upvotes: 0

Views: 551

Answers (1)

Martin R
Martin R

Reputation: 539815

The error message

-[UINavigationController setPlayer:]: unrecognized selector ...

indicates that 

RightViewController *rightViewController = [splitViewController.viewControllers objectAtIndex:1];

returns a UINavigationController instance, and not a RightViewController instance as expected. The solution depends on the structure of your view controllers hierarchy. It may be that you have to proceed similar to the left view controller:

UINavigationController *rightNavController = [splitViewController.viewControllers objectAtIndex:1];
RightViewController *rightViewController = (RightViewController *)[rightNavController topViewController];

Upvotes: 1

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