How to know if ios delegate is released

I use delegation extensively for VIEW - CONTROL - MODEL structure. Usually, CONTROL & MODEL objects are retained during the running of the app, causing little issues.

However, VIEW objects, which are often the instances of UIViewController, are allocated and release numerous times.

Setting nil to the delegate object who is assigned with dynamic UIViewController instance, when it's being deallocated, is one way I know how to avoid EXC_BAD_ACCESS error.

However, even if I always use:

if ([delegate respondsToSelector:@selector(communityModel:finishedDeletingComment:)]) {
    [delegate communityModel:self finishedDeletingComment:succeeded];
}

it's not perfect for preventing error. If different VIEW objects are sharing one or limited number of delegates of a CONTROL object, it's always prone to cause delegates to be replaced by another unintentionally, causing EXC_BAD_ACCESS

Is there better way to manage delegates, to know if it's really available at the moment of calling delegate methods?

I doubt if my usual way of setting properties for delegate sho开发者_如何学编程uld be changed. I use this way to set delegate's properties:

@property (nonatomic, assign) id<ControlDelegate> delegate;

Am I going to the right track doubting about property setting?

I declare delegates as assign properties when my object (which will use delegate) is a member of delegate or member of member of delegate etc. In this case retain property will lead to memory leak. Elsewhere I do not see the reasons to not retains delegate. If it's acceptable for you - try to declare your property as:

@property (nonatomic, retain) id<ControlDelegate> delegate;