CODEWITHSUNDEEP
iosobjective-c
user2512240
user2512240

Reputation: 1

Error: missing property on object 'AppDelegate *'

Teaching myself iOS Programming, and starting by following this book. I ran into error "Property 'MainViewController' not found on object of type 'AppDelegate *'.

I've double and triple checked that I followed the code correctly, even restarted from scratch. I've scoured StackOverflow and tried a few solutions but none worked and few properly match my issue. Any help?

AppDelegate.m (where the error lies)

#import "AppDelegate.h"
#import "WeatherForecast.h"
#import "MainViewController.h"

@implementation AppDelegate

@synthesize managedObjectContext = _managedObjectContext;
@synthesize managedObjectModel = _managedObjectModel;
@synthesize persistentStoreCoordinator = _persistentStoreCoordinator;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    WeatherForecast *forecast = [[WeatherForecast alloc] init];
    self.MainViewController.forecast = forecast;
    // Override point for customization after application launch.
    MainViewController *controller = (MainViewController *)self.window.rootViewController;
    controller.managedObjectContext = self.managedObjectContext;
    return YES;
}

MainViewController.h

#import "FlipsideViewController.h"
#import "WeatherForecast.h"

#import <CoreData/CoreData.h>

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate>

- (IBAction)showInfo;
- (IBAction)refreshView:(id) sender;
- (void)updateView;

@property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (strong, nonatomic) WeatherForecast *forecast;

@end

Upvotes: 0

Views: 482

Answers (1)

Karl
Karl

Reputation: 1233

The problem should be in your second line of application:didFinishLaunchingWithOptions. self.MainViewController is expecting a property in your AppDelegate. Just remove this line and add controller.forecast = forecast; before return YES. At this point you got a reference to your MainViewController and can set the property safely (assuming that MainViewController is set up as the current rootViewController through your Storyboard or XIB).

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{    
   WeatherForecast *forecast = [[WeatherForecast alloc] init];
   // Override point for customization after application launch.
   MainViewController *controller = (MainViewController *)self.window.rootViewController;
   controller.managedObjectContext = self.managedObjectContext;
   controller.forecast = forecast;
   return YES;
}

Upvotes: 1

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