Use NSMutableArray in app delegate in another class

问题

I have an NSMutableArray in my app delegate. I wish to use that mutable array in a different class in my program, as if it were a global variable. How would I do this?

Is it as simple as importing the header and referencing the object?

回答1:

Take advantage of the UIApplication singleton:

YourAppDelegate *appDelegate = (YourAppDelegate *)[[UIApplication sharedApplication] delegate];

Then, access your array property like this: appDelegate.yourArrayProperty

回答2:

Make you array a property of your delegate as Sean said

@property(readonly) NSMutableArray *theArray;

Then access the array like this :

((YourAppDelegateClass *)[UIApplication sharedApplication].delegate).theArray

来源：https://stackoverflow.com/questions/6061659/use-nsmutablearray-in-app-delegate-in-another-class