Question

我有3组精灵（EnemyGroups），这些组按特定顺序排列（每组精灵延迟一秒）。请参阅代码：

EnemyGroup：

struct EnemyGroup    {
    var enemies : [Enemy]
    var isVisible : Bool
    var isStatic : Bool

    func setup   ()  {
    if isStatic {
        for enemy in enemies  {
            enemy.sprite.alpha = 1.0
            enemy.sprite.isUserInteractionEnabled = false

        }
        isVisible = true
    }
        }


    mutating func switchEnemiesON   ()  {
    if !isStatic {
    for enemy in enemies  {

        enemy.sprite.alpha = 1.0
        enemy.sprite.physicsBody?.categoryBitMask = enemyCategory
        enemy.sprite.physicsBody?.collisionBitMask = bombCategory

    }
    isVisible = true
    }
}

mutating func switchEnemiesOFF   ()  {
    if !isStatic {
        for enemy in enemies  {
        enemy.sprite.alpha = 0.0
        enemy.sprite.physicsBody?.collisionBitMask = 0
        enemy.sprite.physicsBody?.categoryBitMask = 0
    }

    isVisible = false
    }
}

在GameScene中

：

   func groupActionSequence (enemyGroup: EnemyGroup)  {
    for enemy in enemyGroup.enemies {
    var enemyGroupWithAction = enemyGroup
    let groupSequence = SKAction.sequence([
        SKAction.run({ enemyGroupWithAction.switchEnemiesON() }),
        SKAction.wait(forDuration: showTime),
        SKAction.run({ enemyGroupWithAction.switchEnemiesOFF() }),
        SKAction.wait(forDuration: hideTime)
        ])

    let repeatGroupAction = SKAction.repeatForever(groupSequence)
    enemy.sprite.run(repeatGroupAction)
    }
}

func groupActionSequenceWithDelay (delayTime: TimeInterval, enemyGroup: EnemyGroup, groupKey: String)   {
    for enemy in enemyGroup.enemies {

        var group = enemyGroup
    let groupSequence = SKAction.sequence([
        SKAction.run({ group.setup() }),
        SKAction.wait(forDuration: delayTime),
        SKAction.run({ self.groupActionSequence(enemyGroup: enemyGroup) })
        ])

    enemy.sprite.run(groupSequence, withKey: groupKey)
    }
}

为敌方群体设置行动：

 groupActionSequenceWithDelay(delayTime: 0, enemyGroup: enemyGroup1, groupKey: "group1")
 groupActionSequenceWithDelay(delayTime: 1, enemyGroup: enemyGroup2, groupKey: "group2")
 groupActionSequenceWithDelay(delayTime: 2, enemyGroup: enemyGroup3, groupKey: "group3")

我将enemyGroup1和enemyGroup2设置为isStatic = false，将enemyGroup3设置为isStatic = true。我将enemyGroup1和enemyGroup2 isStatic更改为true仍然在enemyGroup1和enemyGroup2 as if上运行的操作isStatic = false . How can I get switchEnemiesOFF（）and switchEnemiesON（）to recognize changes in the value of isStatic`？此外，我不想停止操作，因为我希望保持每个组的相同序列在其运行操作中有一秒的差异，这就是为什么我用if语句保护某些函数的原因

Answer 1

让EnemyGroup成为一个类而不是一个Struct。

因为它是一个Struct，所以在运行块闭包中捕获的enemyGroupWithAction变量是您在参数中收到的变量（它也是作为参数传递给函数的副本的副本）。这些副本中的每一个都有自己独立的值（Struct是值类型）并且分开存在。如果enemyGroup是一个对象（类），则只捕获引用（类是引用类型），对属性的任何修改都会影响原始对象实例。

SKActions不承认某些值的变化

1 个答案: