(NO.00004)iOS实现打砖块游戏(十六):导弹发射道具的实现(下)

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(NO.00004)iOS实现打砖块游戏(十六):导弹发射道具的实现(下)

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上一篇我们完成了导弹道具相关的道具制作,本篇中我们来完成其实现代码

首先我们在Star.m的spawnStar方法中添加如下代码:

case brkColorPoolBlue:star = [Star starWithType:starTypeStickShoot];break;

接着打开GameScene.m文件,在星星和反弹棒的碰撞处理方法中添加如下处理分支:

case starTypeStickShoot:@synchronized(self){[Star doStickShootWork];}break;

现在重新回到Star.m中,添加doStickShootWork方法:

+(void)doStickShootWork{GameScene *gameScene = [GameScene sharedGameScene];if (gameScene.isStickShooting) {return;}gameScene.isStickShooting = YES;[gameScene scheduleBlock:^(CCTimer *timer){@synchronized(gameScene){gameScene.isStickShooting = NO;}} delay:10];
}

该方法很简单,首先如果反弹棒已处在射击状态则直接返回.否则将反弹棒设置为射击状态,然后在10秒后取消射击状态.

再次回到GameScene.m中,添加设置射击状态的方法:

-(void)setIsStickShooting:(BOOL)isStickShooting{_isStickShooting = isStickShooting;if (_gunTop) {_gunTop.visible = _isStickShooting;}
}

在初始化方法的最下面中添加如下一行:

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

游戏逻辑每隔1秒钟调用一次autoShoot方法来实现自动射击,那么该方法做了什么事呢?我们来看一下:

-(void)autoShoot{@synchronized(self){if (self.isStickShooting && _gunTop && _gunTop.visible) {[Star shoot:_gunTop.position];}}
}

貌似很简单,方法首先判断当前反弹棒是否处在射击状态,并且设计炮管已初始化且可见.如果这些条件都满足则调用Star类中的shoot方法,并向方法传递了当前炮管位置的坐标.

导弹是可以摧毁砖块的,所以还要实现一个碰撞处理方法:

-(BOOL)ccPhysicsCollisionBegin:(CCPhysicsCollisionPair *)pair bullet:(CCNode *)bulletbrick:(CCNode *)brick{@synchronized(self){        CCSprite *bulletSp = (CCSprite*)bullet;[bullet removeFromParent];[_userInterface updateHitsLabel:[NSString stringWithFormat:@"Hits:%d",++_hits]];_score += ((Brick*)brick).value * _scoreRatio;if (_scoreRatio > 1) {[self updateMsgLabel:[NSString stringWithFormat:@"Score X %d",_scoreRatio]];}[_userInterface updateScoreLabel:[NSString stringWithFormat:@"得分:%d",_score]];[Star spawnStar:(Brick*)brick];[brick removeFromParent];[_level removeFromBricks:brick];}return YES;
}

代码很简单,大家可以自行理解.

最后我们就来实现Star的+shoot方法:

+(void)shoot:(CGPoint)startPos{GameScene *gameScene = [GameScene sharedGameScene];CCPhysicsNode *physWorld = gameScene.physicsWorld;@synchronized(gameScene){CGSize viewSize = [CCDirector sharedDirector].viewSize;CCSprite *bullet = (CCSprite*)[CCBReader load:@"Elements/Bullet"];bullet.position = startPos;[physWorld addChild:bullet];CCActionMoveTo *move = [CCActionMoveTo actionWithDuration:2 position:ccp(bullet.position.x,viewSize.height)];CCActionCallBlock *blk = [CCActionCallBlock actionWithBlock:^{[bullet removeFromParent];}];CCActionSequence *seq = [CCActionSequence actions:move,blk,nil];[bullet runAction:seq];}
}

方法主要逻辑如下: