如何使同一个Facebook对象可用于我的iOS Facebook SDK项目中的所有代码？

Question

I've tried passing in the Facebook object which I named facebook as an argument into classes that rely on it. However, is there a way to use it in a sort of global way so that way I don't have to keep on passing it around between objects?

Answer 1

Well, I see several ways:

• Create a public static method in a class that contains facebook object:

   + (id)getSharedFacebookObject { return facebook; } 

• The second way is to use app delegate:

   MyAppDelegate *appDel = (MyAppDelegate *)[[UIApplication sharedApplication] delegate]; id Facebook = appDel.facebook; 

Answer 2

Your best bet would be to use the singleton pattern.

http://en.wikipedia.org/wiki/Singleton_pattern

Create a new class that has the facebook object as an instance variable and set the new class as the facebook delegate. You can then get the sharedInstance from any class and it will return the same object.

This may not actually be the correct solution to your problem. It may require you to add another layer of communication between the singleton and the particular view controller you are using. If you are only performing simple functions then this may be fine.