iphone - Xcode: Connection Between View Controllers and App Delegate -

this noob question can't head around it.

how make connection between 2 viewcontrollers or view controller , appdelegate? add following app delegate "h" file

@class rootviewcontroller;   @interface tabbarwithsplitviewappdelegate : nsobject <uiapplicationdelegate, uitabbarcontrollerdelegate> {     rootviewcontroller *rootviewcontroller;    } @property (nonatomic, retain) iboutlet rootviewcontroller *rootviewcontroller;  @end 

and create connection in interface builder. root view controller app delegate , automatically tells me thats rootviewcontroller added above.

and if on app delegate "m" file:

#import "rootviewcontroller.h"  nslog(@"controller %@",rootviewcontroller); 

it gives bunch of numbers indicating there connection

but know xcode 4 changed since no longer have main.xib can create connection, connections programatically.

i`ve tried using same code without "iboutlet" adding:

rootviewcontroller = [[rootviewcontroller]alloc] init; 

but nothing seems work.

can out?

thanks in advance

you want create ivar of view controller in app delegate.

viewcontroller *myvc; @property (nonatomic, retain) iboutlet viewcontroller *myvc; 

then synthesize in implementation file.

then when view controller loads, call along lines of this:

- (void)viewdidload {     appdelegateclass *appdelegate = (appdelegateclass *)[[uiapplication sharedapplication] delegate];     appdelegate.myvc = self; } 

at point, have direct connection view controller app delegate. similarly, opposite call app delegate methods view controller. in case, you'd set delegate in view controller's header.

id delegate; @property (nonatomic, assign) id delegate; 

again synthesizing in implementation file.

now when in viewdidload, you'd call this:

- (void)viewdidload {     self.delegate = (appdelegateclass *)[[uiapplication sharedapplication] delegate]; } 

that should give need going, hope helps