ios6 - ViewController added as a subView getting released too soon -


i trying optimize code in app. have quite few viewcontrollers use common "keypad". wanted extract keypad separate viewcontroller , include existing viewcontrollers. way obliviate duplicate code (which needed deal reactions keypad) in separate viewcontrollers.

so in keypadvc have methods set this.

-(ibaction)keypadkeypressed:(id)sender {     [self.delegate interpretkeypressed:[[sender titlelabel] text]]; }

in "parent" viewcontrollers include keypad adding subview plain uiview placed in interface builder (so have visual placeholder) , hooked variable keypadview.

-(void) viewdidload {     [super viewdidload];      keypadviewcontroller *kpvc = [[keypadviewcontroller alloc] init];     [kpvc setdelegate: self];     [[self keypadview] addsubview:[kpvc view]]; }

this displays fine, when press button on keypadviewcontroller zombie object because object released. tried declare keypadviewcontroller *kpvc in @interface , tried self instantiating method like: 

-(keypadviewcontroller *)kpvc {     if (!kpvc) {         kpvc = [[keypadviewcontroller alloc] init];     }     return kpvc; }

i modified viewdidload method, result same. object gets released soon. if add nslogs can see -(ibaction)keypadkeypressed keypadvc never gets called, because keypadvc released.

what doing wrong? using arc , ios6 sdk.

thanks

ps: pseudo-code make things shorter - hope there no typos - if not issue. :)

keypadviewcontroller *kpvc = [[keypadviewcontroller alloc] init]; [kpvc setdelegate: self]; [[self keypadview] addsubview:[kpvc view]]; self.kpvc = kpvc;

that retains view controller.

however, doing totally illegal because not using parent-child architecture. see answer here: https://stackoverflow.com/a/15962125/341994

you can add subview view, must not add view controller's view subview view without going through elaborate parent-child architecture. , not doing that.

i explain parent-child architecture here:

http://www.apeth.com/iosbook/ch19.html#_container_view_controllers


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