Question

I’m confused about below situation.
I have a viewcontroller(VC), it has 1 subview(SubV) and 1 other class.(classA)
Also i have an event handler called from classA, i want this event handler to change my subV in VC.

When i access SubV from VC directly, it is OK, image of subview changed etc.
But when the classA triggers an event handler of VC, it reaches VC, also access subView’s method but no change in my subView !!! (I also try delegate but the result is same)

ViewController.h

@interface ViewController : UIViewController {
.
IBOutlet SubView *subView;
ClassA *classA;
.
}
@property (retain, nonatomic) IBOutlet SubView *subView;
@property (retain, nonatomic) ClassA *classA;

ViewController.m

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.subView = [self.subView init];
self.classA = [[ClassA alloc] init];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(eventListener:) name:@"eventType" object:nil];

}

- (void) eventListener:(NSNotification *) not
{
   [self.subView RefreshView]; // it doesnt work! calls refreshView method but no change
}

- (IBAction)buttonPressed:(id)sender
{ 
   [self.subView RefreshView]; // it works perfect
}

SubView.h

@interface SubView : UIImageView 

@property int state;
@property NSArray *imageArray;

- (void) RefreshView;
- (id) init;

@end

SubView.m

- (void) RefreshView{
[self stopAnimating];
self.imageArray = [NSArray arrayWithObjects:[UIImage imageNamed:@"a.png"], nil];
self.animationDuration = 1;   
self.animationImages = self.imageArray;
self.animationRepeatCount = 0;
[self startAnimating];
}

ClassA.m

-(void)methodA{
  [myEvent requestEvent];
}

So, what i am trying to do here is accessing & changing subView with a button in Viewcontroller and with a thread running in another classA

Answer 1

Finally i’ve found the solution! Because of the thread that i run in ClassA, i should use ‘

[self performSelectorOnMainThread:@selector(myMethodToRefreshSubView) withObject:nil    waitUntilDone:NO];

in my eventListener method.