Cannot set property of UIImageView subclass - objective-c

Question

I've subclassed UIImageView, it's called ACCascadeImageView.
#interface ACCascadeImageView : UIImageView{
BOOL isSpotlight;
}
#property (assign, nonatomic) BOOL isSpotlight;
-----
#implementation ACCascadeImageView
#synthesize isSpotlight;
I then create instances like so, and add a gesturerecognizer..
ACCascadeImageView *imageview =
[[ACCascadeImageView alloc] initWithFrame:imageframe];
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleSingleTap:)];
[imageview addGestureRecognizer:singleTap];
In the handleSingleTap method, I loop through my UIScollView subviews, and I try to do this for each one...
(imageview in this scope is [gestureRecognizer view])
[imageview setIsSpotlight:NO];
But I get this...
*** Terminating app due to uncaught exception 'NSInvalidArgumentException',
reason: '-[UIImageView setIsSpotlight:]: unrecognized selector sent to instance 0x6888be0'
Why has my ACCascadeImageView suddenly become UIImageView? I apologize if I'm doing something stupid, but I've subclassed UIImageView before just fine. I'm confused.
I should say that I've NSLog'd [imageview class] and I get, "ACCascadeImageView".
Here's the problem:
NSArray *cascadeImages = [PhotoCascade subviews];
for (ACCascadeImageView *v in cascadeImages){
NSLog(#"RESPONDS: %d", [v respondsToSelector:#selector(setIsSpotlight:)]);
[v setIsSpotlight:NO];
}
I get :
RESPONDS: 1
RESPONDS: 0
Then it dies.

Answer 1

You can't be sure [gestureRecognizer view] is your UIImageView. To check this try NSLog(#"view: %#", [gestureRecognizer.view class]);. My tests says it's just UIView.
If you're adding gesture recognizer to your image view the selector will be fired only when the user taps this view. So you could omit those checks at all.

Answer 2

By your results, and since you only test once per object, it seems the first object in the array is your custom subview, but the second is not. Maybe somehow one of the objects in cascadeImages isn't an ACCascadeImageView. Step through the array and perform introspection on each one, logging the results, to make sure the array only contains ACCascadeImageViews.

Answer 3

You're saying that your handleSingleTap is returning TRUE in response to respondsToSelector:#selector(setIsSpotlight:), but then when you try to use setIsSpotlight, it fails? That is a mystery.
For example, I've created this super simple example, and it works as you'd expect:
#import "ViewController.h"
#interface Test : UIImageView
#property (assign, nonatomic) BOOL isSpotlight;
#end
#implementation Test
#synthesize isSpotlight;
#end
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
Test *test = [[Test alloc] initWithFrame:self.view.frame];
[self.view addSubview:test];
test.userInteractionEnabled = YES;
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleSingleTap:)];
[test addGestureRecognizer:tap];
}
- (void)handleSingleTap:(UIGestureRecognizer *)sender
{
Test *imageview = (Test *)[sender view];
NSLog(#"%s %d", __FUNCTION__, [imageview respondsToSelector:#selector(setIsSpotlight:)]);
[imageview setIsSpotlight:NO];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
#end
The problem has to be something simple, but with limited code snippets provided in your question, it's not obvious what the problem is. But the code you've provided above would not manifest the sort of problem you describe. There must be some rogue UIImageView in your app!