CODEWITHSUNDEEP
objective-cios
Mike
Mike

Reputation: 29

self.window.rootViewController = self.someController not working?

I came across this post here (link below) and it states that you can replace:

[window addSubview: someController.view];

with:

self.window.rootViewController = self.someController;

My Base SDK for All Configurations is set to Latest iOS (currently set to iOS 4.2), however when I try to build the project I get this error: Request for member, 'mainMapView' in something not a structure or union.

Adding it with the commented out addSubview: works fine though. This is the code in question...

#import "MakeView2AppDelegate.h" 

 #import "MainMap.h" 

 @implementation MakeView2AppDelegate

 @synthesize window;


 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // Override point for customization after application launch.

    MainMap *mainMapView = [[MainMap alloc] initWithNibName:nil bundle:nil];

    //[self.window addSubview:mainMapView.view];

    self.window.rootViewController = self.mainMapView;

    [self.window makeKeyAndVisible];

    return YES;
}

self.window.rootViewController vs window addSubview

Upvotes: 1

Views: 3829

Answers (4)

PJR
PJR

Reputation: 13180

you have not create property for mainMapView.

so you can not write self.mainMapView

you have to use mainMapView.

for more help see this :

           Understanding your (Objective-C) self

http://useyourloaf.com/blog/2011/2/8/understanding-your-objective-c-self.html

Upvotes: 0

dtuckernet
dtuckernet

Reputation: 7895

In your example, you are calling self.mainMapView, but unless mainMapView is a property on the class, this won't work. If you remove the "self." from it, it will work fine.

Upvotes: 1

ingh.am
ingh.am

Reputation: 26752

Since iOS4 this has been the default behaviour in the templates in Xcode4. It's probably better to use addSubview for backwards compatibility as the other method does not work with iPhone OS 3.x

Upvotes: 1

GarlicFries
GarlicFries

Reputation: 8323

This is because you're looking for mainMapView as a property of the app delegate. Change that line to:

self.window.rootViewController = mainMapView;

This is assuming that the MapView class inherits from UIViewController, however. Does it?

Upvotes: 3

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