IBAction to subview to check if image is hidden

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... :(");
    }
}