Receiving value from one method to another - Objective C

Question

I need to receive the value that comes from the settings of the device (That I already got, as it is in the code below) and I need to pass this return to a string that will allow login to my application, take a look at the code:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString* txt = [defaults objectForKey:@"txtEmail"];

The code above is in Appdelegate. m (Inside the folder called Baker), and that’s why I’m picking up the information that was set up on the device, so far so good, is working right. The problem is that I need to pass this variable 'txt' to another class (if I may call it that) Constants. h (It is in the folder called Bakershelf) and put in this code snippet:

#define NEWSSTAND_MANIFEST_URL @"[link_do_site]?digitha_userid=[txt]

Replacing the [txt] at the value received from the first.

Thank you.

Answer 1

Buddy, I’ve been having a similar problem with you, I was trying to store data generated in one class and move on to another. The solution I found was the following:

Go to the class that will receive the data, and create a variable that will store the data and its property. Then create also a method that takes as argument the data you want to save, and within the method make it be stored in the variable you created.

In the file Classeorigemdados. m, put the #import "Classequestor. h" and instate a class object that will receive the data, and pass the value you want in the method argument.

As in the example code I will do below to get better illustrated.

*** ClasseQueRecebeDados.h ***

import<UIKit/UIKit.h>

@interface ClasseQueRecebeDados : NSObject{

 NSString* receptor;

}

@property(nonatomic, retain) NSString* receptor;

-(void)metodoTransfereDados:(NSString*)dadosRecebido;

@end

In the Received Classfile. m you implement this method as follows:

#import "ClasseQueRecebeDados.h"

@implementation ClasseQueRecebeDados

@syntesize receptor;

-(void)metodoTransfereDados:(NSString*)dadosRecebido{

 self.receptor = dadosRecebido;
}

@end

Now in Classequeceddados. m you do so:

// Importe a classe para instanciar um objeto dela e ter acesso ao seu método.
    #import "ClasseQueRecebeDados.h"

      @implementation ClasseQueForneceDados

    -(void)DentroDeAlgumMetodoDaClasseQueForneceDados{

     ClasseQueRecebeDados* armazenador = [[ClasseQueRecebeDados alloc]init];

      // Aqui você instancia a classe ClasseQueRecebeDados e usa o método.
     [armazenador metodoTransfereDados: self.dadoQueSeráEnviadoHaOutraClasse];

    }
    (DEMAIS CODIGO DA IMPLEMENTAÇÂO ...)

    @end

When using the method, you will send the data to the variables of the object you requested. Inside the method, I believe it will be more useful to save the data in a plist, than to have it only in the memory of the app, this way the data will be visible from various points of the app.

I hope it has helped, any doubt just comment below!

Answer 2

#import <UIKit/UIKit.h>

@interface UIView ()

@end

NSString *Global_PESS_CODIGO;

#import <UIKit/UIKit.h>
#import "Constants.h"

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@end

and in Appdelegate. m

NSString* txt = [defaults objectForKey:@"txtEmail"];

Global_PESS_CODIGO = txt;

then it just matters #import "Constants.h" when you want to use the string

Answer 3

Why do you need to define a constant? Why not create a class with a method that returns the value?

Asim:

@interface Constants
+ (NSString *)newsstandManifestURLString;
@end

@implementation Constants
+ (NSString *)newsstandManifestURLString {
    NSString *txt = [[NSUserDefaults standardUserDefaults] objectForKey:@"txtEmail"];
    return [NSString stringWithFormat:@"[link_do_site]?digitha_userid=%@", txt];
}
@end