iOS - How to print value in textfield using delegate - iphone

Question

I am new to iOS. I have some problem do you have some solution for it? I am not able to print the json value in textfield
This is my contactViewController.m file:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
fname.text=#"Hello";
}
After the view is loaded hello value is shown in the text box, but when I call list button to get the json values:
-(IBAction)list:(id)sender{
vedant=[[WebserviceViewController alloc]init];
[vedant listContacts];
}
Then from webserviceViewController.m I pass the jsonResponse to the same file i.e contactViewController.m and parse the json value and print it but it does not shows the value in text field
-(void)allContacts:(NSString *)JSONResponse{
NSLog(#"%#",JSONResponse);
NSData *jsonData = [JSONResponse dataUsingEncoding:NSASCIIStringEncoding];
//
NSError *err;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&err];
int accCount =[json count];
for(int i=0;i<accCount;i++){
NSData *jsonData = [JSONResponse dataUsingEncoding:NSASCIIStringEncoding];
//
// NSLog(#"%#",JSONResponse);
NSError *err;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&err];
NSString *firstName = [NSString stringWithFormat:#"%#", [[json objectAtIndex:i] objectForKey:#"first_name"]];
NSLog(#"%#",firstName); //this prints the actual first name in console But
fname.text=firstName;
NSLog(#"%#",fname.text); //it prints "(Null)" in console
}
}
Do I need to create delegate to pass value?
Yes, then any help of creating such delegate some article or example.

Answer 1

Check if fname isn't nil. If you forgot to properly connect it in Interface Builder, fname will be nil and all messages sent to it (like setText:) will be ignored.

Answer 2

Please First check that you have bind your textfield with your fname variable. If yes then try to assign value using this:
fname.text=[NSString stringWithFormat:#"%#",firstName];
Just try this. I hope this will work for you.

Answer 3

Get your first name(i.e value from json) into global value and assign that global value into your textfield . It is so simple. if you still have doubts than reply i'll post sample code

Answer 4

txtName.text=firstname; OR
txtName.text=[NSString stringWithFormat:#"%#",firstName];

Answer 5

Using Delegate i solved this problems
In my contactViewController.m file:
-(IBAction)list:(id)sender{
vedant=[[WebserviceViewController alloc]init];
vedant.delegate=self;
[vedant listContacts];
}
In webserviceViewController.h I created my own delegate
#protocol WebservicesDelegate <NSObject>
-(void)allContacts:(NSString *)JSONResponse;
#end
then in webserviceViewController.m file after getting the json response from backend i am sending the response back to my contactViewController.m file using this code
[self.delegate allContacts:jsonResponse];
the compiler comes back to allContacts function in contactViewController.m file this code is same i didn't change the code now it prints the value.
-(void)allContacts:(NSString *)JSONResponse{
NSLog(#"%#",JSONResponse);
NSData *jsonData = [JSONResponse dataUsingEncoding:NSASCIIStringEncoding];
//
NSError *err;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&err];
int accCount =[json count];
for(int i=0;i<accCount;i++){
NSData *jsonData = [JSONResponse dataUsingEncoding:NSASCIIStringEncoding];
//
// NSLog(#"%#",JSONResponse);
NSError *err;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&err];
NSString *firstName = [NSString stringWithFormat:#"%#", [[json objectAtIndex:i] objectForKey:#"first_name"]];
NSLog(#"%#",firstName); //this prints the actual first name in console But
fname.text=firstName;
NSLog(#"%#",fname.text); //it prints "(Null)" in console
}
}
I think because i was trying to get data from different view and wanted to display the data in another view was the problem.
But by creating the delegate the problem was solves and i can easily send the data from one view to another view.