Basically, the view hierarchy is like this :
A (UIViewController class)
- B (subview of A.view)(UIView Class)
B, has a class, and one of the functions requires getting some info from A.
What is the best way to invoke a function in A from B?
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wahkiz
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2 Answers
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If B is a subview of A, [B superview] is A.
Update 1
If you're looking for the view controller for which A is the view, check out this response to a similar question. To summarize, according to the UIResponder documentation, if an instance of UIView is the view of a UIViewController, its nextResponder will be the view controller (else, nextResponder is its superview).
Update 2
If A is the controller, and B is A.view's subview, you can get to A like so:
UIResponder *A = [[B superview] nextResponder];
Keep in mind that nextResponder's return type is UIResponder *, so you might want to verify that A is actually a UIViewController using isKindOfClass:.
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Cameron Spickert
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Thanks for the response. But when I tried calling [[B superview] aFunction], it gave reason: '-[UIView aFunction]: unrecognized selector'. Even doing casting for [B superview] does not works. – wahkiz Mar 09 '11 at 04:24
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Is A a view controller's view? – visakh7 Mar 09 '11 at 04:32
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Actually. I think I am doing it wrong. Because B is not a subview of A, B is actually A.view's subview. – wahkiz Mar 09 '11 at 04:54
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Updated my answer regarding B being A.view's subview. – Cameron Spickert Mar 09 '11 at 18:25
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Hope this helps.
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I eventually got around the problem by making the function in app delegate (where there is an iboutlet to my A viewcontroller), and using the appdelegate function to call the intended function in the A viewcontroller. This is not a good solution, although it works. There has to be a better way. – wahkiz Mar 09 '11 at 06:43