used NSString object in another file shown always null value ? - iphone

Question

i have two .m file .i used nsstring object on another .m file its always null.
//postputgetFunction.h
#property(retain,nonatomic) IBOutlet NSMutableString *postRegisterResponseUserId;
//postputgetFunction.m
#synthesize postRegisterResponseUserId;
-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
if ([flag isEqualToString:#"post"])
{
NSLog(#"Post received data here.....");
NSDictionary *dict=[NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
postRegisterResponseName=[dict valueForKey:#"Name"];
postRegisterResponseSuccess=[dict valueForKey:#"Success"];
postRegisterResponseUserId=[dict valueForKey:#"UserId"];
NSLog(#"ReceiveData :Name : %# \n Success : %# \n UserId : %#",postRegisterResponseName,postRegisterResponseSuccess,postRegisterResponseUserId);
//Above statement display the value properly..........
flag=Nil;
}
}
but i am using in another .m file ... In this .m file its shown null value .. like this,
//Verification.h
#import "PostPutGetFunction.h"
#property (retain, nonatomic) PostPutGetFunction *postputgetFunction;
//verification.m
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
postputgetFunction=[[PostPutGetFunction alloc]init];
}
- (IBAction)verificationBtnClick:(id)sender
{
NSLog(#"%#",postputgetFunction.postRegisterResponseUserId);
//here its always shown NULL ... i didnt get the value here ...
}

Answer 1

In other .m file's viewDidLoad method you allocating and initializing the PostPutGetFunction using
postputgetFunction=[[PostPutGetFunction alloc]init];
That's why the variable defined in PostPutGetFunction class NSMutableString *postRegisterResponseUserId initialized to Null. You can use the Delegates for passing the data between the two controllers. Or alternatively you can store the userID in NSUserDefault class like below
**First Part**
NSDictionary *dict=[NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSString *name =[dict valueForKey:#"Name"];
NSString *success=[dict valueForKey:#"Success"];
NSString *userid =[dict valueForKey:#"UserId"];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:name forKey:#"NAME"];
[defaults setObject:success forKey:#"SUCCESS"];
[defaults setObject:userid forKey:#"USERID"];
[defaults synchronize];
And to retrieve the values in another class.m use below code
**Second Part**
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *name = [defaults objectForKey:#"NAME"];
NSString *success = [defaults objectForKey:#"SUCCESS"];
NSString *userid = [defaults objectForKey:#"USERID"];
And also you do not use IBOutlet for NSMutableString type rather it's used for UI Control types like Below

Answer 2

You are Declaring a new object of PostPutGetFunction, and for sure the value postRegisterResponseUserId will be null
if you want to accomplish that you have to use Delegation, take a look at this answer