Question

I am using UIRefreshControl for pull down to refresh for iOS 6, it is working. I am using a custom delegate to update when it is done, in that method I call,

[self->refresh endRefreshing];

I have declared,

UIRefreshControl *refresh;

in the interface file, because I am not able to call

[self->refresh endRefreshing] 

from by custom delegate method.

Its all working perfectly for iOS 6, but on lower version of iOS, it fails because `UIRefreshControl’ is only available from iOS 6 and above.

How can i conditionally declare them so that it works both on iOS6 and below?

Answer 1

1. Declare the instance variable as id.
2. Cast the variable to UIRefreshControl * whenever you use it.
3. Around the places where you are using it, use if (NSClassFromString(@"UIRefreshControl") != Nil) { ... } to ensure that UIRefreshControl is available.