Iphone access a property value from AppDelegate

Question

How to access a property value of AppDelegate class from someView Controller without creating reference of the delegate in view controller?

Answer 1

I'm not quite sure what you mean - there are multiple ways to get information from your application delegate into a view controller, and the phrase "without creating reference of the delegate" is unclear. Your options basically are:

1. Reference the application delegate, casting as appropriate. You would write code in your view controller class like:

   id propertyValue = [(MyAppDelegate *)[[UIApplication sharedApplication] delegate] myProperty];

2. Pass the property in when creating the view controller. This requires the view controller to have a @property declared and @synthesized for use, then you would have the app delegate just set the property on the view controller instance.

Neither of these options require that you retain a copy of your app's delegate as a @property, but the first does reference the delegate once.

Answer 2

[UIApplication sharedApplication].delegate;

Answer 3

[UIApplication sharedApplication].delegate

You'll also need to include the app delegate header file in your view controller and possibly typecast the delegate from id to your actual app delegate class.

#include "MyAppDelegate.h"

((MyAppDelegate *)[UIApplication sharedApplication].delegate).myProperty;