Question

How can we access UIButton of other class. i.e. We have a class A and Button ButtonA . When ButtonA clicked then it will add a SubView ViewB on App Delegate Window . Now when Somebody clicks ButtonB on ViewB then i want to change ButtonA image?

How can i do that?

Class B is singleton class

Answer 1

You have to make accessible Class A from Class B, you have lots of options, for instance some of them:

• Declare a Class A instance variable in your Class B, and assign it when creating class B from Class A.
• Declare a callback block (as instance variable) in Class B to be called when Button B is clicked.
• From Class A listen to a NSNotification that posted by Class B.
• Implement KVO from Class A to Class B's Button B to listen for changes on it.