Get all instances of a class in objective c?

3 Solutions Collect From Internet About “Get all instances of a class in objective c?”

I have two ideas:

1/ Create a class array with all the instances static NSArray* instances;, register them when initializing, unregister when deallocating. The array should have only weak references, otherwise they will never be deallocated.

2/ NSNotification. All instances can wait for a notification and if you tap, you send the notification.

If you just need to find all instances for debugging purposes, you can use the Allocations instrument and change the Recorded Types to only your class. This will give you a dandy list of all your objects. You can then interact with them using lldb by using their address.

If they’re all subviews of the same view, you could iterate over parentView.subviews and find them that way. Something like this:

for (UIView *v in parentView.subviews) {
    if ([v isKindOfClass:[MyViewClass class]]) {
        // remove recognizer here
    }
}

Another, more efficient, option would be to have a flag in your view controller that you set when the first recognizer is triggered and use to short-circuit any future recognizer handler calls. Something like this:

@property (nonatomic) BOOL shouldRespondToEvent;
@synthesize shouldRespondToEvent=_shouldRespondToEvent;

- (void)viewDidLoad {
    [super viewDidLoad];
    self.shouldRespondToEvent = YES;
    // other viewDidLoad stuff here
}

- (void)gestureHandler:(UIGestureRecognizer*)recognizer {
    if (!self.shouldRespondToEvent)
        return;
    self.shouldRespondToEvent = NO;
    // rest of handler code here
}