Example of FBKVOController usage

FBKVOControllerSample.m

#import <KVOController/KVOController.h>

- (void)viewDidLoad
{
    	[super viewDidLoad];
	
	[self.KVOController observe:self keyPath:@"lastSelectedItem.primaryCategoryID" options:0 block:^(id weakself, id object, NSDictionary *change) {
		[weakself updateConditionPopupForItems:[weakself selectedItems]];
		[weakself updateConditionDescriptionAvailableForItems:[weakself selectedItems]];
	}];
}