IBAction to subview to check if image is hidden - ios

Question

I am trying to check if a image of a subview is hidden or not, by clicking a button. The log does display but i cant get the hidden status of the image somehow.
Whats going wrong here? Hope u can help me!
Viewdidload:
SubSlide1Hoofdstuk3 *subslide1 = [[SubSlide1Hoofdstuk3 alloc] init];
CGRect frame = self.view.frame;
frame.origin.x = 0;
frame.origin.y = 0;
subslide1.view.frame = frame;
// This works finaly
UIImageView *zwart = subslide1.imageZwart;
[zwart setImage:[UIImage imageNamed:#"imageblack.jpg"]];
[subslide1.b1 addTarget:self action:#selector(switchImageZwart:) forControlEvents:UIControlEventTouchUpInside];
[_scrollView addSubview:subslide1.view];
The IBAction to check the image in subview is hidden:
-(IBAction)switchImageZwart:(id)sender
{
SubSlide1Hoofdstuk3 *switchactie = [[SubSlide1Hoofdstuk3 alloc] init];
UIImageView *wit = switchactie.imageWit;
UIImageView *zwart = switchactie.imageZwart;
if(zwart.hidden == YES) {
NSLog(#"Image black is hidden!");
} else if(wit.hidden == YES) {
NSLog(#"Image white is hidden!");
} else {
NSLog(#"Can't say... :(");
}
}

Answer 1

The problem here is that inside your -(IBAction)switchImageZwart:(id)sender method you create a new instance of SubSlide1Hoofdstuk3 and checking its properties (the UIImageViews) instead of checking the actual UIImageView objects you created on viewDidLoad:. What you want actually is to hold a reference to subslide1 and check that instead.
Ps. Since the button calling the check method is actually a subview of your subslide1, you could get a reference like:
SubSlide1Hoofdstuk3 *switchactie = [sender superView];
EDIT: An example on your actual code:
in your .h file:
#property(nonatomic, strong) SubSlide1Hoofdstuk3 *subslide1;
in your .m file:
#synthesize subslide1;
- (void)viewDidLoad
{
//...
self.subslide1 = [[SubSlide1Hoofdstuk3 alloc] init];
CGRect frame = self.view.frame;
frame.origin.x = 0;
frame.origin.y = 0;
self.subslide1.view.frame = frame;
// This works finaly
UIImageView *zwart = self.subslide1.imageZwart;
[zwart setImage:[UIImage imageNamed:#"imageblack.jpg"]];
[self.subslide1.b1 addTarget:self action:#selector(switchImageZwart:) forControlEvents:UIControlEventTouchUpInside];
[_scrollView addSubview:self.subslide1.view];
}
-(IBAction)switchImageZwart:(id)sender
{
SubSlide1Hoofdstuk3 *switchactie = self.subslide1;
UIImageView *wit = switchactie.imageWit;
UIImageView *zwart = switchactie.imageZwart;
if(zwart.hidden == YES) {
NSLog(#"Image black is hidden!");
} else if(wit.hidden == YES) {
NSLog(#"Image white is hidden!");
} else {
NSLog(#"Can't say... :(");
}
}