Question

A really noob question here.
I have 2 VCs.
One is called SGPlayer and another is SGDownloader. Basically I want to change the property of SGDownloader from the first class.
I import the SGDownloader class like this:

//  SGPlayer.h

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

@interface SGPlayer : UIViewController

@property (nonatomic, retain) SGDownloader *downloaderClass;

SGPlayer.m is like this:

//  SGPlayer.m

#import "SGPlayer.h"

@interface SGPlayer ()

@end

@implementation SGPlayer
@synthesize downloaderClass;

I then set the downloadUrl property form the SGDownloader class in an action triggered by UIButton like that:

- (IBAction)loadURLButton:(id)sender {

    [self performSegueWithIdentifier:@"loadMyData" sender:nil];
    downloaderClass.downloadURL = [NSURL URLWithString:@"http://www.google.com"];
}

NSLog gives me (null) on my URL. If I use prepareForSegue method all is fine:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([[segue identifier] isEqualToString:@"loadMyData"])
    {
        SGDownloader *vc = [segue destinationViewController];

        vc.downloadURL = [NSURL URLWithString:@"http://www.google.com"];
    }
}

The thing is I don’t want to use prepareForSegue here.

I assume I might be misunderstanding the whole concept of how do you transfer the data between classes in Obj-C.

Edit:

I do have a synthesised property in the SGDownloader class:

@interface SGDownloader : UIViewController

@property (nonatomic, retain) NSURL *downloadURL;

@end

Answer 1

Either create property of downloadURL and synthesize it or you can use delegate to pass values between class