Sending information from a view controller to another - ios

Question

The question is, I have 9 buttons on viewcontroller (ViewController), and i have an outlet collection for storing all these buttons outlet.
Then i have an action method for handling click event of these buttons.
What I want is send the button image background (as an UIImage * img)of the CLICKED button, segue to another viewcontroller (vc2),
here are my code :
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
#property (strong, nonatomic) IBOutletCollection(UIButton) NSArray *cardBtns;
- (IBAction)cardAction:(id)sender;
#end
#import "ViewController.h"
#import "ResultViewController.h"
#interface ViewController ()
#property(strong,nonatomic)UIImage *image;
#end
#implementation ViewController
- (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)cardAction:(id)sender {
for(UIButton *cardButton in self.cardBtns){
self.image = [cardButton currentBackgroundImage];
}
[self performSegueWithIdentifier:#"cardSegue" sender:self.image];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
//UIImage * img = [UIImage imageNamed:#"f1"];
UIImage * img = (UIImage *)sender;
ResultViewController *viewcontroller = [segue destinationViewController];
viewcontroller.img = img;
}
#end
in vc2, i have another button here, and i wish to paint this button background img with the img just sent from vc1 segue.
#interface ResultViewController : UIViewController
#property (weak, nonatomic) IBOutlet UIButton *cardBtn;
#property(strong,nonatomic)UIImage *img;
- (IBAction)cardDismiss:(id)sender;
#end
#import "ResultViewController.h"
#interface ResultViewController ()
#end
#implementation ResultViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self.cardBtn setImage:self.img forState:UIControlStateNormal];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)cardDismiss:(id)sender {
[self dismissViewControllerAnimated:NO completion:nil];
}
#end
assume my buttons is 1,2,3,4,5,6,7,8,9
for now, whatever buttons i clicked in vc1, it s always displaying as '6' in vc2...
any suggestions? thanks

Answer 1

The problem is this:
- (IBAction)cardAction:(id)sender {
for(UIButton *cardButton in self.cardBtns){
self.image = [cardButton currentBackgroundImage];
}
[self performSegueWithIdentifier:#"cardSegue" sender:self.image];
}
This will set self.image to the last item in self.cardBtns. You want to set self.image to sender.currentBackgroundImage (and change id in the argument type to UIButton *), and just eliminate the loop.