iOS Property not found on object of type 'AppDelegate *'

Question

I have two viewControllers accessing a NSNumber on the AppDelegate. One of them can see it, and the other can't. I am totally confused by this.

The one with the problem has this code.

AppDelegate *dataStore = (AppDelegate *)[[UIApplication sharedApplication] delegate];
dataStore.downHUD = [NSNumber numberWithFloat:(float)progress];

The other has this.

AppDelegate *dataStore = (AppDelegate *)[[UIApplication sharedApplication] delegate];
dataStore.downHUD = [NSNumber numberWithFloat:(float)0];

Both imports the AppDelegate in the .m file but I end up with

Property 'downHUD' not found on object of type 'AppDelegate *'

with the first one. Anyone that can help me see what's wrong?

I copied and pasted a lot of code into the AppDelegate by mistake, that has been corrected. Is there some sort of link that could got broken?

Answer 1

Your two view controllers may refer to different AppDelegate code. Even though the Xcode Project Navigator shows only one set of AppDelegate files, and Jump to Definition shows the same AppDelegate class definition in both cases, one of the view controllers may actually have different delegate code.

I had this very problem with a delegate class definition, where some member variables were only available in one view controller but not in the other.

Right-click on each ViewController.m file in the Project Navigator, and use Show in Finder to see whether they are both in the same location as the desired AppDelegate files. If not, move the VC files to the correct location and add them to the project.

Answer 2

If you have imported the header files then it should work. Did you try to clean and re-build your project? You can do that with CMD + Shift + K (or by selecting Clean from the Project menu).

Answer 3

If you're using expo this is how to get rid of the bug. "reactDelegate" was introduced in sdk 44.0.0 so if you're using sdk 43.0.0 here's is how your code should look in your "AppDelegate.m" from line 35 - 46.

RCTBridge *bridge = [[RCTBridge alloc] initWithDelegate:self launchOptions:launchOptions];
RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge moduleName:@"main" initialProperties:nil];
rootView.backgroundColor = [UIColor whiteColor];
self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
UIViewController *rootViewController = [UIViewController new];
rootViewController.view = rootView;
self.window.rootViewController = rootViewController;
[self.window makeKeyAndVisible];

[super application:application didFinishLaunchingWithOptions:launchOptions];