Question

I would like to get at

- (void)applicationWillTerminate:(UIApplication *)application

a variable from a view controller class.
I have build an tabbar application and only added the tabbar controller to the appdelegate.

[window addSubview:tabBarController.view];

How can i get an variable from the TestViewController:

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>

@interface TestViewController : UIViewController {
    IBOutlet UILabel *testLabel;
    NSString *currentString; //Value that i want to save at applicationWillTerminate
}

@property (nonatomic, retain) UILabel* testLabel;
@property (nonatomic, retain) NSString* currentString;

@end

Answer 1

It’s somewhat incidental that TestViewController hasn’t been dealloc’d by the time you reach applicationWillTerminate – it might make sense to store that value a level higher in your application. That approach would be to always store currentString in the UIApplicationDelegate so that you don’t have to fetch it later:

@implementation TestViewController
- (void)setCurrentString:(NSString *)currentString {
    ((MyAppDelegate *)[[UIApplication sharedApplication] delegate]).currentString = currentString;
} 
@end