Question

I’m making a game on iPhone using cocos2d, and I have a question.
In my init method I’m doing this :

[self schedule:@selector(newMonster:) interval:1];   

It create a new monster every second.
But I’d like that the interval change over time. For example :

• The 10 first seconds of the game: a new monster appears every 1 second.
• Then for 10 seconds: a new monster appears every 0.8 second.
• And after every 0.5 second…

How can I do that?

Thanks !

Answer 1

You may try this- (I have copied some code from @bddckr)

Initial time:

self.monsterSpawnStartDate = [NSDate date];
self.lastTimeScheduledBefore = 0;//new var

Scheduled Method to create monster

- (void)scheduledMethod {
    NSTimeInterval seconds = [[NSDate date] timeIntervalSinceDate:monsterSpawnStartDate];

    [self newMonster]; // Let a new monster spawn
    if (seconds >= 20.0  && lastTimeScheduledBefore == 10){
      [self unschedule:@(scheduledMethod)];
      [self unschedule:@(scheduledMethod) interval:0.5];
      lastTimeScheduledBefore = 20;
    }
    else if (seconds >= 10.0 && lastTimeScheduledBefore == 0){
      [self unschedule:@(scheduledMethod)];
      [self unschedule:@(scheduledMethod) interval:0.8]
      lastTimeScheduledBefore = 10;
    }
}

You can modify it as your need. You can use mod if it goes through a cycle.