NSObject+RateLimiting.m

- (NSMutableDictionary *)throttleActionHash
{
    NSMutableDictionary *throttleData = objc_getAssociatedObject(self, THROTTLE_ACTION_HASH_PROPERTY_KEY);

    if (!throttleData) {
        throttleData = [[NSMutableDictionary alloc] init];
        objc_setAssociatedObject(self, THROTTLE_ACTION_HASH_PROPERTY_KEY, throttleData, OBJC_ASSOCIATION_RETAIN);
    }

    return throttleData;
}

- (void)RateLimiting_throttle:(SEL)action duration:(NSTimeInterval)duration
{
    NSMutableDictionary *actionHash = [self throttleActionHash];

    NSDate *lastCalled = [actionHash objectForKey:NSStringFromSelector(action)];

    if (!lastCalled || ([[NSDate date] timeIntervalSinceDate:lastCalled]) >= duration) {
        [actionHash setObject:[NSDate date] forKey:NSStringFromSelector(action)];
        __weak typeof(self) weakSelf = self;
        IMP imp = [weakSelf methodForSelector:action];
        void (*func)(id, SEL) = (void *)imp;
        func(weakSelf, action);
    }
}