UIViewController obj在mycustomview控制器实现中已更新，如何在子类中获取它

Question

i created a myCustomviewcontroller and made all other .m files as subclasses to it.

and myCustomviewcontroller contains an UIViewController obj and property defined as:

@interface MyCustomViewController : UIViewController{
    IBOutlet UINavigationController *navigationController;
        UIViewController *topView;

}

@property(nonatomic, retain) IBOutlet UINavigationController *navigationController;
@property(nonatomic, retain) IBOutlet UIViewController *topView;


@end

in the implementation the topview is initialized or given a view controller as in

@implementation MyCustomViewController

//some method
    topView = appDelegate.navigationController.topViewController;
@end

and there is another class demo.h which uses MyCustomViewController

@interface demo : MyCustomViewController{
}

and in the implementation of demo.mi want to get the topview value. not just the instance of topview but the value which is assigned to topview in the implementation of MyCustomViewController.m is this possible if so please help me

thanks.

Answer 1

By the rule of inheritance you can use the instance variable of base class or super class. so i will prefer you whenever you use inheritance you initialise the property in derived class not in super class so in your case you initialise

super.topView = appDelegate.navigationController.topViewController;

in demo not in MyCustomViewController.