AdMob Interstitial every fifth game - ios

Question

I implemented the AdMob Interstitial ad in my project and it works well. Now I want the AdMob Interstitial ad to only appear for every fifth game and not after every single game. Can someone help me?
Here is my code for the Admob in my GameViewController:
- (void)viewDidLoad {
[super viewDidLoad];
//addInterstitial
self.interstitial = [[GADInterstitial alloc] initWithAdUnitID:#"ca-app-pub-XXXXXXXXXX/XXXXXXXXXX"];
GADRequest *request = [GADRequest request];
request.testDevices = #[#"XXXXXXXXXXXXXXXXXXXXXXXXXX"];
[self.interstitial loadRequest:request];
[[NSNotificationCenter defaultCenter]addObserver:self
selector:#selector(handleNotification:) name:#"showAd" object:nil]; }
- (void)handleNotification:(NSNotification *)notification
{
if ([notification.name isEqualToString:#"showAd"]) {
if ([self.interstitial isReady]) {
[self.interstitial presentFromRootViewController:self]; }
UPDATE:
I have this code in the GameViewController:
- (void)viewDidLoad {
[super viewDidLoad];
//addInterstitial
if ([[NSUserDefaults standardUserDefaults] objectForKey:GAME_AMOUNT_KEY] == nil){
NSNumber *number = [NSNumber numberWithInt:0];
[[NSUserDefaults standardUserDefaults] setObject: number forKey: GAME_AMOUNT_KEY];
[[NSUserDefaults standardUserDefaults] synchronize];
}
if ([[[NSUserDefaults standardUserDefaults] objectForKey:GAME_AMOUNT_KEY] intValue] >= 5){
[self callAd];
self.interstitial = [self createAndLoadInterstitial];
NSNumber *number = [NSNumber numberWithInt:0];
[[NSUserDefaults standardUserDefaults] setObject: number forKey: GAME_AMOUNT_KEY];
[[NSUserDefaults standardUserDefaults] synchronize];
}
- (void)handleNotification:(NSNotification *)notification {
if ([notification.name isEqualToString:#"showAd"]) {
if ([self.interstitial isReady]) {
[self.interstitial presentFromRootViewController:self];
}
}
}
- (void) callAd{
[[NSNotificationCenter defaultCenter]addObserver:self selector:#selector(handleNotification:) name:#"showAd" object:nil];
}
- (GADInterstitial *)createAndLoadInterstitial {
self.interstitial = [[GADInterstitial alloc] initWithAdUnitID:MyAdUnitID2];
self.interstitial.delegate = self;
GADRequest *request2 = [GADRequest request];
request2.testDevices = #[#"XXXXXXXXXXXXXXXXXXXXXX"];
[self.interstitial loadRequest:request2];
return self.interstitial;
}
- (void)interstitialDidDismissScreen:(GADInterstitial *)interstitial {
self.interstitial = [self createAndLoadInterstitial];
}
And in the GameScene.m this code:
- (void)showGameOver{
//addInterstitial
int score = [[[NSUserDefaults standardUserDefaults] objectForKey:GAME_AMOUNT_KEY] intValue]+1;
NSNumber *newNumber = [NSNumber numberWithInt:score];
[[NSUserDefaults standardUserDefaults] setObject:newNumber forKey:GAME_AMOUNT_KEY];
[[NSUserDefaults standardUserDefaults] synchronize];
[[NSNotificationCenter defaultCenter] postNotificationName:#"showAd" object:nil];

Answer 1

Use NSUserDefaults:
- (void) callAd
{
// Code to call your ad here
}
- (void) viewDidLoad
{
// If you haven't played yet, sets to 0
if ([[NSUserdefaults standardUserDefaults] objectForKey:GAME_AMOUNT_KEY] == nil){
NSNumber *num = [NSNumber numberWithInt:0];
[[NSUserDefaults standardUserDefaults] setObject: num forKey: GAME_AMOUNT_KEY];
[[NSUserDefaults standardUserDefaults] synchronize];
}
// If you have played
if ([[[NSUserdefaults standardUserDefaults] objectForKey:GAME_AMOUNT_KEY] intValue] >= 5){
[self callAd]; // ad is called
NSNumber *num = [NSNumber numberWithInt:0];
[[NSUserDefaults standardUserDefaults] setObject: num forKey: GAME_AMOUNT_KEY];
[[NSUserDefaults standardUserDefaults] synchronize]; // resets to zero
}
}
And whenever a game is over:
int score = [[[NSUserdefaults standardUserDefaults] objectForKey:GAME_AMOUNT_KEY] intValue]
+ 1;
NSNumber *newNumber = [NSNumber numberWithInt:score];
[[NSUserDefaults standardUserDefaults] setObject:newNumber forKey: GAME_AMOUNT_KEY];
[[NSUserDefaults standardUserDefaults] synchronize]; // Sets to new value
The key can be anything really. At the top of your .m file put:
#define GAME_AMOUNT_KEY #"Game Amount Key"
UPDATE
Change:
- (void)handleNotification:(NSNotification *)notification
{
if ([notification.name isEqualToString:#"showAd"]) {
if ([self.interstitial isReady]) {
[self.interstitial presentFromRootViewController:self];
}
To:
- (void)handleNotification:(NSNotification *)notification
{
if ([notification.name isEqualToString:#"showAd"]) {
if ([self.interstitial isReady]) {
if ([[[NSUserDefaults standardUserDefaults] objectForKey:GAME_AMOUNT_KEY] intValue] >= 5){
[self.interstitial presentFromRootViewController:self];
NSNumber *number = [NSNumber numberWithInt:0];
[[NSUserDefaults standardUserDefaults] setObject: number forKey: GAME_AMOUNT_KEY];
[[NSUserDefaults standardUserDefaults] synchronize];
}
}
And change (in ViewDidLoad):
if ([[[NSUserDefaults standardUserDefaults] objectForKey:GAME_AMOUNT_KEY] intValue] >= 5){
[self callAd];
self.interstitial = [self createAndLoadInterstitial];
NSNumber *number = [NSNumber numberWithInt:0];
[[NSUserDefaults standardUserDefaults] setObject: number forKey: GAME_AMOUNT_KEY];
[[NSUserDefaults standardUserDefaults] synchronize];
}
To
[self callAd];
self.interstitial = [self createAndLoadInterstitial];