CODEWITHSUNDEEP
iphoneobjective-cprotocols
Ken
Ken

Reputation: 31161

Multiple protocols

I'm declaring that my app delegate conforms to the protocols

<UIApplicationDelegate, SKPaymentTransactionObserver>

in the app delegate header file (i.e. the app delegate interface).

The compiler tells me at numerous places in my code that:

warning: type 'id <UIApplicationDelegate>' does not conform to the 'SKPaymentTransactionObserver' protocol

What's up?

Upvotes: 0

Views: 724

Answers (2)

Chuck
Chuck

Reputation: 237080

You're probably doing something like [[SKPaymentQueue defaultQueue] addTransactionObserver:[[UIApplication sharedApplication] delegate]]. Since -[UIApplication delegate] is declared as returning id<UIApplicationDelegate>, the compiler has no way of knowing that the object returned will implement the SKPaymentTransactionObserver protocol. Try assigning the delegate to a variable that's statically typed as your delegate class and pass that to the method you're trying to call and the compiler should be happy.

Upvotes: 2

WrightsCS
WrightsCS

Reputation: 50717

Your ApplicationDelegate seems to be missing some of the required delegates, for example:

- (void)applicationWillResignActive:(UIApplication *)application

Check what delegate methods SKPaymentTransactionObserver requires, and add them to your AppDelegate.m

Also, check over the SKPaymentTransactionObserver Protocol Reference

Upvotes: -1

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