CODEWITHSUNDEEP
iosobjective-c
poyo fever.
poyo fever.

Reputation: 752

Notify a super view when any of its sub views is set to hidden

I'm developing an app for iOS and I have a view that contains sub views and I want to call a function when any of its sub views is set to hidden.

Can someone point me to the right direction?

Upvotes: 3

Views: 442

Answers (1)

trojanfoe
trojanfoe

Reputation: 122458

OK, so assuming you implement a method in the superview called subview:(UIView *)view wasHidden:(BOOL)hidden then you would need to call it after setting viewToHide.hidden:

viewToHide.hidden = YES;
if ([[viewToHide superview] respondsToSelector:@selector(subview:wasHidden:)]) {
    [[viewToHide superview] subview:viewToHide wasHidden:YES];
}

A bit crude but I believe it will work. A better solution might be to get the superview to do the hiding itself, via (custom) methods like:

- (void)hideSubview:(UIView *)subview;
- (void)unhideSubview:(UIView *)subview;

and then it can do what it likes after (un)hiding.

Better still might be to use KVO, as has been flagged as a duplicate.

Upvotes: 3

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