accessing IBOutlet properties from another class - ios

Question

How do I access IBOutlets that have been created in another class?
here is my code...
Class one
.h
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
#property (retain, readwrite) IBOutlet UIView *myView;
#end
.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize myView;
- (void)viewDidLoad {
[super viewDidLoad];
}
#end
Class two
.h
#import <UIKit/UIKit.h>
#interface ViewController2 : UIViewController
- (IBAction)accion:(id)sender;
- (IBAction)btnBack:(id)sender;
#end
.m
#import "ViewController.h"
#import "ViewController2.h"
#interface ViewController2 ()
#end
#implementation ViewController2
- (void)viewDidLoad {
[super viewDidLoad];
}
- (IBAction)accion:(id)sender {
ViewController *a = [ViewController new];
UIView *someView = [a myView];
[someView setBackgroundColor:[UIColor redColor]];
}
- (IBAction)btnBack:(id)sender {
[self dismissViewControllerAnimated:YES completion:nil];
}
#end
why not works? no change the backgroundColor when return on my view

Answer 1

I think you try to delegate pattern to set the values Viewcontroller2.h file
Add protocol like this...
#import <UIKit/UIKit.h>
#protocol tutorialDelegate <NSObject> //set protocol
-(void)delegatesDescribedWithDescription;
#end
#interface ViewController2 : UIViewController
#property (weak, nonatomic) id<tutorialDelegate> tutorialDelegate1;
- (IBAction)accion:(id)sender;
- (IBAction)btnBack:(id)sender;
#end
after the declaring protocol in viewcontroller2.m file first synthesize and call method like this..
#import "ViewController.h"
#interface ViewController2 ()
#end
#implementation ViewController2
#synthesize tutorialDelegate1; // synthesize here
- (void)viewDidLoad {
[super viewDidLoad];
}
- (IBAction)accion:(id)sender {
ViewController *a = [ViewController new];
UIView *someView = [a myView];
[someView setBackgroundColor:[UIColor redColor]];
}
- (IBAction)btnBack:(id)sender {
// Here we tell delegate to invoke method in parent view.
[self.tutorialDelegate1 delegatesDescribedWithDescription
];
[self dismissViewControllerAnimated:YES completion:nil];
}
#end
and finally we implement this method in view controller.m file but first set delegate in viewcotroller.h file like this...
#import <UIKit/UIKit.h>
#import "ViewController2.h" //import here
#interface ViewController : UIViewController <tutorialDelegate> //set delegate
#property (retain, readwrite) IBOutlet UIView *myView;
#end
and viewcontroller.m file
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize myView;
- (void)viewDidLoad {
[super viewDidLoad];
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"yourIdentifier"]) {
ViewController2 *detailViewController =
segue.destinationViewController;
// here we set the ViewController to be delegate in
// detailViewController
detailViewController.tutorialDelegate1 = self;
}
}
// ViewController must implement tutorialDelegate's methods
// because we specified that ViewController will conform to
// tutorialDelegate protocol
-(void)delegatesDescribedWithDescription
{ // here your code please
viewTemp.backgroundColor =[UIColor redColor];
}
#end