Question

正如标题所示，我在创建我的敌人精灵和英雄激光（子弹）之间的联系方面存在问题。我通过以下方法创建我的敌人并将它们添加到视图中。

-(void)Enemies{
//not always come
int GoOrNot = [self getRandomNumberBetween:0 to:1];

if(GoOrNot == 1){

    SKSpriteNode *enemy;

    int randomEnemy = [self getRandomNumberBetween:0 to:1];
    if(randomEnemy == 0)
        enemy = [SKSpriteNode spriteNodeWithImageNamed:@"enemy_spaceship.png"];
    else
        enemy = [SKSpriteNode spriteNodeWithImageNamed:@"Spaceship15.png"];


    enemy.scale = 0.4;

    enemy.position = CGPointMake(450, 0);
    enemy.hidden = NO;

    CGPoint location = CGPointMake(450, 320);

    SKAction *moveAction = [SKAction moveTo:location duration:2.5];
    SKAction *doneAction = [SKAction runBlock:(dispatch_block_t)^() {
        //NSLog(@"Animation Completed");
        enemy.hidden = YES;
    }];

    SKAction *moveAsteroidActionWithDone = [SKAction sequence:@[moveAction,doneAction ]];

    [enemy runAction:moveAsteroidActionWithDone withKey:@"asteroidMoving"];
    [self addChild:enemy];

    _enemyBullets = [[NSMutableArray alloc] initWithCapacity:kNumEnemyBullet];
    for (int i = 0; i < kNumEnemyBullet; ++i) {
        SKSpriteNode *enemyBullets = [SKSpriteNode spriteNodeWithImageNamed:@"rocket"];
        enemyBullets.hidden = YES;
        [enemyBullets setXScale:0.5];
        [enemyBullets setYScale:0.5];
        [_enemyBullets addObject:enemyBullets];
        [enemy addChild:enemyBullets];
    }

}

}

然后我通过一个可变数组添加子弹，然后将我的子弹添加到敌人的精灵作为他们的孩子。那部分有效。我可以在英雄和敌人的子弹之间建立联系并被检测到。我所遇到的问题是我的英雄的激光不会与敌人建立联系，因此我不能让敌人从激光中受到攻击。我尝试将物理主体添加到我正在使用的方法中，但将所有其他精灵抛入地狱，他们不再正常响应。

以下代码是我在更新方法中使用的碰撞代码：

for (SKSpriteNode *enemyBullets in _enemyBullets) {
        if (enemyBullets.hidden) {
            continue;
        }
        if ([_ship intersectsNode:enemyBullets]) {
            enemyBullets.hidden = YES;
            SKAction *blink = [SKAction sequence:@[[SKAction fadeOutWithDuration:0.1],
                                                   [SKAction fadeInWithDuration:0.1]]];
            SKAction *blinkForTime = [SKAction repeatAction:blink count:4];
            SKAction *shipExplosionSound = [SKAction playSoundFileNamed:@"explosion_large.caf" waitForCompletion:NO];
            [_ship runAction:[SKAction sequence:@[shipExplosionSound,blinkForTime]]];
            _lives--;
            _livesLabel.text = [NSString stringWithFormat:@"%d Lives", _lives];
            NSLog(@"your ship has been hit!");
        }
    }

有什么方法可以用来为我的敌人创建一个物理身体，这样我就可以创建英雄激光和敌人精灵之间的联系，我目前使用相同的结构？任何帮助都非常感激。

Answer 1

你当然可以为你的敌人创造一个物理身体。在此代码enemy = [SKSpriteNode spriteNodeWithImageNamed:@"enemy_spaceship.png"];之后，您可以添加如下物理主体：

enemy.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.size];
enemy.physicsBody.categoryBitMask = CategoryEnemy; // or whatever you need
enemy.physicsBody.collisionBitMask = CategoryRock; // or whatever you need
enemy.physicsBody.contactTestBitMask = CategoryBullet // or whatever you need
enemy.physicsBody.dynamic = NO; // or YES
enemy.physicsBody.allowsRotation = NO; // or YES
enemy.physicsBody.restitution = 0; // or another value between 0 to 1
enemy.physicsBody.friction = 0.0; // or another value between 0 to 1

创建物理主体的方法有很多种。你可以做一个矩形，圆形，轮廓纹理或绘制自己的。

您应该阅读有关此主题的Apple docs，以便更好地了解您可以做什么以及可以使用哪些属性。

为SKSpriteNode创建物理主体以检测联系人

1 个答案: