Getting an error while trying to access property from an extern Controller in Xcode 4.2 - objective-c

Question

In a first controller, I create an instance variable for my model, because I want to edit its content from a controller and then access the same object from another controller.
In the second controller, I get an error when trying to access the object:
Property 'levels' not found on object of type FirstController.
Model.h
#imports....
#property (readwrite,copy) NSMutableString *answersString;
FirstController.h
#import <UIKit/UIKit.h>
#import "Model.h"
#interface FirstController : UIViewController{
// some declarations
}
#property (nonatomic, retain) LevelsCompleted *levels;
#end
FirstController.m
#import "FirstController.h"
#interface FirstController(){
//stuff
}
#end
#implementation FirstController
#synthesize levels;
//stuff
- (IBAction)backButton:(id)sender { // This is the changeAnswerString method
if (levels ==nil) self.levels = [[LevelsCompleted alloc]init];
self.levels.answersString=#"1";
[self dismissModalViewControllerAnimated:NO];
}
#end
SecondController.m
#import "SecondController.h"
#import "FirstController.h"
#interface SecondController(){
//stuff
}
#end
#implementation SecondController
-(void) viewWillAppear:(BOOL)animated{
NSLog(#"%#",FirstController.levels.answersString);
// the line above gives me the error "Property 'levels' not found on object of type FirstController
}
#end
Can someone tell me what I am doing wrong here? I have tried to create a FirstController object in the SecondController.h, but this does not give me the same property and hence I do not get the right value of the NSString I modified in the first view.

Answer 1

levels is a instance variable so you cannot access it without instantiating an object first.
You should do something like
FirstController *controller = [[FirstController alloc] initWithNibName:#"First" bundle:nil];
NSLog(#"%#",controller.levels.answersString);
[controller release]

Answer 2

You cannot access another viewcontroller from current viewcontroller directly. Define Level in AppDelagte method and then you can access it from anywhere.

Answer 3

What about moving/adding the LevelsCompleted *levels property to the secondviewcontroller and fill SecondViewcontroller.levels.answerstring when you use backbutton: in you first controller?

Answer 4

As a advice try NSUSERDEFAULT to access it,.,

Answer 5

By Doing Things As Below you can Achive as You want
Ddeclare NSMutableString As in your viewController Class As Global variable.
1) LevelsCompleted.h Class
#import <UIKit/UIKit.h>
NSMutableString *answersString;// In this way this answersString would accessible through out the Application and No Need to make property & synthesiz answersString .
#interface LevelsCompleted : UIViewController{
}
LevelsCompleted.m Class
//First create that NSMutableString object in its LevelsCompleted.m class
#import"LevelsCompleted.h"
#interface LevelsCompleted
-(void)viewDidLoad{
answersString=[NSMutableString alloc]init];//here created answersString object
}
#end //end of LevelsCompleted
2)FirstController.h class
#import <UIKit/UIKit.h>
extern NSMutableString *answersString;
#interface FirstController : UIViewController{
// some declarations
}
#end
FirstController.m class
#import "FirstController.h"
#implementation FirstController
- (IBAction)backButton:(id)sender {
// Because i have created that answersString Global in LevelsCompleted.h class
//we can directly Access and can set the any string Value to that answersString as Below
answersString=#"1";
[self dismissModalViewControllerAnimated:NO];
}
#end
SecondController.h class
extern NSMutableString *answersString;// please do this carefully fro getting access the answersString instance
#interface SecondController:UIViewController{
//stuff
}
#end
SecondController.m class
#implementation SecondController
-(void) viewWillAppear:(BOOL)animated{
NSLog(#"%#",answersString);//here you may access easily.
}
#end
In above code everything would work because i have done the same thing in my app
just try to catch the concept of extern, global variable .