Time for action – storing the completed levels

Open the LevelSelectLayer class.

1. This is how the number of levels completed is retrieved from inside the layer's constructor:

   _levelsCompleted = UserDefault::getInstance()- >getIntegerForKey("levelsCompleted");

2. Initially, _levelsCompleted will equal 0 if no data is present. So we store level 1 as "unlocked". This is how that's done:

   if (_levelsCompleted == 0) {
       _levelsCompleted = 1;
       UserDefault::getInstance()->setIntegerForKey("levelsCompleted", 1);
       UserDefault::getInstance()->flush();
   }

3. Then, whenever we start a new level, we update the number of levels completed if the new level number is larger than the value stored.

   if (_currentLevel > _levelsCompleted) {
       _levelsCompleted = _currentLevel;
       UserDefault::getInstance()->setIntegerForKey("levelsCompleted", _levelsCompleted);
       UserDefault::getInstance()->flush();
   }

   Note

   You don't have to flush the data...