objective c - How can I get notified when NSViewController instance is loaded / unloaded -


on ios, there viewdidappear / viewdiddisappear methods. being added yosemite (see https://developer.apple.com/library/prerelease/mac/releasenotes/appkit/rn-appkit/#10_10viewcontroller).

question: how can detect when view appearing / disappearing pre-os x 10.10?

you can use loadview 

- (void)loadview {     [super loadview];  }

i don't know goal if needed it. there viewdidunload , viewwillunload apple deprecated them , warned people being misused.

the cost of releasing objects when view unload not expensive got rid of it.


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