Using NSNotificationCenter with UIView subclass: http://swiftiostutorials.com/quick-tip-adding-removing-nsnotificationcenter-observers-uiview-subclass/

NotificationView.m

@implementation TestView

#pragma mark - Observers

- (void)didMoveToWindow
{
    if (self.window) // If self.window != nil, it means view was added to the window
    {
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(test:)
                                                     name:@"TestNotification"
                                                   object:nil];
    }
}

- (void)willMoveToWindow:(UIWindow *)newWindow
{
    if (newWindow == nil) // if newWindow == nil, it means view was removed from the window
    {
        [[NSNotificationCenter defaultCenter] removeObserver:self
                                                        name:@"TestNotification"
                                                      object:nil];
    }
}

#pragma mark - Actions

- (void)test:(NSNotification *)notification
{
    NSLog(@"Test!");
}

@end