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iOS

Posted by James Fredrick
James Fredrick
1,756 Points

viewDidDisappear method

Hi! I have been working on an iPhone app and was wondering if anybody could tell me how to properly use the viewDidDisappear method. I tried using the viewDidUnload but that is not supported in IOS 6.1. I also tried using viewDidDisappear like a normal viewDidUnload:

-(void)viewDidDisappear
{

[super viewDidDisappear];

}
Mike Bronner
Mike Bronner
16,395 Points
Mike Bronner
Mike Bronner
16,395 Points

Hi Raphael, I had a similar question as well. See my findings here: https://teamtreehouse.com/forum/viewdidunload-no-longer-in-ios6-will-observers-remove-themselves?sort=newest&topic=iOS

I believe they apply here as well - you can forget about them if you are developing only for ios6.

1 Answer

Amit Bijlani
STAFF
Amit Bijlani
Treehouse Guest Teacher
Amit Bijlani
Amit Bijlani
Treehouse Guest Teacher

There is no right or wrong usage of method viewDidDisappear or viewWillAppear. It's an event notification about your view controllers life cycle, so if there's any housekeeping you need to do as your view is no longer going to be visible then this is the method for it. Do you need to remove notification observers? Do you need to hide the keyboard? Do you need to stop audio from playing? Do you need stop something from downloading?

Mike Bronner
Mike Bronner
16,395 Points
Mike Bronner
Mike Bronner
16,395 Points

Thanks Amit! This helps clarify things for me as well. So while viewDidUnload is no longer relevant, viewDidDisappear provides opportunity to do your housekeeping. Thanks!