Question

I am trying to make an app that contains a class that is created in the app delegate.
I initialize it with:

    Mobile *tmp = [[Mobile alloc] init];
    mobile = tmp;
    [tmp release];

and then I try to use it in other classes in my app with this:

    projectAppDelegate *delegate = (projectAppDelegate *)[[UIApplication sharedApplication] delegate];
    mobile = delegate.mobile;

but when I do something like:

[mobile enter:x :y];

it crashes…

Is there something I did wrong, or is there any solution for making a class that all the other classes in the app can use?

Thank you.

Answer 1

If you want to use instances of your object you have to store them as properties of app delegate.

//appdelegate.h
//
//...
//
@interface AppDelegate : NSObject <UIApplicationDelegate> {
  Mobile *tmp;
}
//...

//appdelegate.m
//
//...
//
- (BOOL)application:(UIApplication *)application 
  didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

  mobile = [[Mobile alloc]init];      
}
//...
-  (void)dealloc {
  [mobile release];
  [super dealloc];
//...
}

Than you have to get a pointer to your application delegate shared instance and call your mobile property.

//... Somewhere
AppDelegate* ref = (AppDelegate*) [[UIApplication sharedApplication] delegate];
NSLog(@"%@", [ref mobile]);
//...