iOS use variable with another m file when button click change it - ios

Question

i need to change urlStr variable when my button clicked from another file. I'm writing my files; I explained everything i think too easy but hard for me please help me.
Thanks a lot.
Request.h file
#import <Foundation/Foundation.h>
#interface Request : NSObject{
}
Request.m file
#import "Request.h"
#import "MyViewController.h"
static NSString * const urlStr = #"http://google.com";
// I WANT TO CHANGE THIS urlStr WHEN storebutton CLICKED
#interface Request () {
BOOL reachable;
}
MyviewController.h file
#import <UIKit/UIKit.h>
#interface MyViewController : UIViewController{
}
#end
MyViewController.m file
#import "MyViewController.h"
#interface MyViewController ()
#end
#implementation MyViewController
- (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.
}
-(void)storebutton
{
NSString *urlStr = #"http://yahho.com"; // WHEN MY store button click action
}
#end

Answer 1

Make urlStr as static variable only, then create a static setter method for it inside Request.m and declare it in Request.h as shown below.
+ (void)setURLString:(NSString *) urlString
{
urlStr = urlString;
}
call this method on done button press as
-(void)storebutton
{
NSString *newURL = #"http://yahho.com";
[Request setURLString:newURL];
}