Objective-C: Accessing variables from another class [duplicate] - ios

Question

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Passing data between view controllers
(45 answers)
Access Variable from Another Class - Objective-C
(2 answers)
Closed 8 years ago.
I'm creating a project so that I have two view controllers, connected by a modal segue with an identifier "login_success".
In the primary view controller, I have a text field that takes the input of whatever the user types, and a button to perform the segue.
In the next controller, I have a label that is supposed to print out whatever the user typed.
My code:
DICViewController.h (First View Controller):
#import <UIKit/UIKit.h>
#interface DICViewController : UIViewController <UITextFieldDelegate>
#property (weak, nonatomic) IBOutlet UITextField *txtUsername;
- (IBAction)sigininClicked:(id)sender;
- (IBAction)backgroundTap:(id)sender;
#end
DICViewController.m:
#import "NewViewController.h"
#interface DICViewController ()
#end
#implementation DICViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)sigininClicked:(id)sender {
{
[self performSegueWithIdentifier:#"login_success" sender:self];
}
}
- (IBAction)backgroundTap:(id)sender {
[self.view endEditing:YES];
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
return YES;
}
#end
NewsViewController.h (The other view controller):
#import <UIKit/UIKit.h>
#interface NewViewController : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *steamId; //my label
#end
NewsViewController.m:
No code was added here.
Thanks in advance to anyone that can help.
Again, I would like to be able to set the text in the label equal to the text the user types in the text field.

Answer 1

When performing a segue the preferred way to pass data from one view controller to another is to make use of the method -prepareForSegue:sender:.
In your case the following lines of code should work:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
NewsViewController *newsVC = segue.destinationViewController;
[newsVC view]; // this loads the view so that its subviews (the label) are not nil
newsVC.steamID.text = self.txtUsername.text;
}
(Place this method anywhere in your DICViewController.m.)

Answer 2

I think The better way is to set global variables. Just make normal class
variables.h
#import <Foundation/Foundation.h>
#interface variables : NSObject {
float VariableYouWant;
}
+ (_tuVariables *)sharedInstance;
#property (nonatomic, assign, readwrite) float VariableYouWant;
and
variables.m
#import "variables.h"
#implementation variables
#synthesize VariableYouWant = _VariableYouWant;
+ (_tuVariables *)sharedInstance {
static dispatch_once_t onceToken;
static variables *instance = nil;
dispatch_once(&onceToken, ^{
instance = [[variables alloc] init];
});
return instance;
}
- (id)init {
self = [super init];
if (self) {
}
return self;
}
#end
Way to use:
import header file of variables and
variables *globals = [variables sharedInstance];
and simply access variables with
globals.VariableYouWant =