Objective-C：如何从通用应用程序中的AppDelegate移出？

Question

I am developing a Universal app where I have

imageTracker_iPhone.xib
imageTracker_iPad.xib
imageTracker.h
imageTracker.m

I want to move from AppDelegate_iPhone to imageTracker. I am doing this in didFinishLaunchingWithOptions but its not working before this code I was using

imageTracker *vRDi = [[imageTracker alloc] initWithNibName:@"imageTracker_iPhone" bundle:nil];
        [self.view addSubview:vRDi.view]; 

but it gave error request for member 'view' in something not a structure or union . Even if code is like

[window addSubview:vRDi.view];

now The function is like below and its not working. I want to move from AppDeligate to imageTracker. please help

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

    [window addSubview:imageTracker.view];    
    [self.window makeKeyAndVisible];

    return YES;    
}

In this case It does not move to imageTracker_iPhone because did not tell any where to move to this file, so want to know that HOw to tell that which file to move either imageTracker_iPhone or imageTracker_iPad.

Answer 1

You probably want to set the delegate window's rootViewController to make your first controller active. (If you create a new test app from a single controller, non-storyboard template, you can see the kind of code that's needed in didFinishLaunchingWithOptions:.)

Edit: Actually, it's even easier than that. If you specify a universal app when creating a single view controller project, it creates the exact code to test which kind of device and load the matching .xib file. (Xcode 4.2, at least.)

Answer 2

your code should be something like this

imageTracker *vRDi;
Bool isiPhone = UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone;
if(isiPhone)
  vRDi = [[imageTracker alloc] initWithNibName:@"imageTracker_iPhone";
else
  vRDi = [[imageTracker alloc] initWithNibName:@"imageTracker_iPad";

and make sure that your connect view outlet in both xib's and the file owner is "imageTracker" Class.