Question

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

Answer 1

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?