Assigning to 'AppDelegate *' from incompatible type 'id<UIApplicationDelegate>'

Question

In my project it says Assigning to 'AppDelegate *' from incompatible type 'id'.

What exactly is this? Why did this warning occur?

I have declared in .m

AppDelegate *appdev; 

and in viewDidLoad

{     appdev = [[UIApplication sharedApplication]delegate];     <= warning here } 

I want to hide this warning. What should I do? Thanks in advance.

Answer 1

since you know they equal, add a cast to let the compiler know

 AppDelegate* app = (AppDelegate*)[[UIApplication sharedApplication]delegate]; 

---

since this might come up in Swift too

 let app = UIApplication.shared.delegate as! AppDelegate