Question

In my .h file

@interface DemoApp : UIViewController   {
    UITextView *textView;
@private

    NSString *status;

    NSInteger *track1Len,*track2Len;


}
@property (nonatomic,retain) NSString *status;

In .m file

    @synthesize status;
- (void)onDecodeCompleted:(NSString *)sts
{
   status=sts;
   NSLog(@"status is %@",status);

}

- (IBAction)processButton:(id)sender
{
   NSLog(@"status is %@",status);
   // here I am getting null value
}

I just to access my variable throughout my class file.In ondecodecompleted method,I am getting the value that is passed as parameter but after the process button is pressed I am getting null value.

Answer 1

try: self.status in both places.

- (void)onDecodeCompleted:(NSString *)sts
{
   self.status=sts;
   NSLog(@"status is %@",self.status);

}

- (IBAction)processButton:(id)sender
{
   NSLog(@"status is %@",self.status);
   // here I am getting null value
}

Also since you are using NSString which has a mutable subclass, you should mark it as copy and not retain

@property (nonatomic,copy) NSString *status;