实现分析 - Enemy

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启动addEnemy的循环Listing 5.18  GameplayLayer.m init method additions[self schedule:@selector(addEnemy) interval:10.0f]; addEnemy 作为对外的入口 - 内部统一用 createObjectOfType 来处理 如果XXX （不再加入Enemy了），unschedule这个循环 Listing 5.17  GameplayLayer.m addEnemy method-(void)addEnemy {CGSize screenSize = [CCDirector sharedDirector].winSize;    RadarDish *radarDish = (RadarDish*)     [sceneSpriteBatchNode getChildByTag:kRadarDishTagValue];if (radarDish != nil) {if ([radarDish characterState] != kStateDead) {            [self createObjectOfType:kEnemyTypeAlienRobot              withHealth:100              atLocation:ccp(screenSize.width * 0.195f,              screenSize.height * 0.1432f)              withZValue:2];        } else {            [self unschedule:@selector(addEnemy)];        }    }}

下面是CreateObjectOfType的一部分

-(void)createObjectOfType:(GameObjectType)objectType withHealth:(int)initialHealth atLocation:(CGPoint)spawnLocation withZValue:(int)ZValue {  if (kEnemyTypeRadarDish == objectType) {       CCLOG(@"Creating the Radar Enemy");       RadarDish *radarDish =  [[RadarDish alloc] initWithSpriteFrameName:@"radar_1.png"];       [radarDish setCharacterHealth:initialHealth];       [radarDish setPosition:spawnLocation];       [sceneSpriteBatchNode addChild:radarDish z:ZValue tag:kRadarDishTagValue];       [radarDish release];    } else if (kEnemyTypeAlienRobot == objectType) {      CCLOG(@"Creating the Alien Robot");      EnemyRobot *enemyRobot =  [[EnemyRobot alloc] initWithSpriteFrameName:@"an1_anim1.png"];        [enemyRobot setCharacterHealth:initialHealth];        [enemyRobot setPosition:spawnLocation];        [enemyRobot changeState:kStateSpawning];        [sceneSpriteBatchNode addChild:enemyRobot z:ZValue];        [enemyRobot setDelegate:self];        [enemyRobot release];    } else if (kEnemyTypeSpaceCargoShip == objectType) {    ......

创建了enemy后，它的状态会是 kStateSpawning