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?
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How are the sub-views set to hidden? – trojanfoe May 14 '14 at 10:19
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viewToHide.hidden = YES; – poyo fever. May 14 '14 at 10:20
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Refer URL: Someone has already answered http://stackoverflow.com/questions/17033581/ios-uiview-detect-hidden-state-change-in-subview – Gopal Raju May 14 '14 at 10:26
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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.
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thank you for your reply . it will work but i want to do it by observing the change in hidden property . – poyo fever. May 14 '14 at 10:30
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2@poyofever. Yeah that's fair enough. The answer you need has been linked in several places on this page. – trojanfoe May 14 '14 at 10:31