它不断告诉我"Class'GameScene'没有初始化器"

Question

import SpriteKit

class GameScene: SKScene {
    var movingGround: JTMovingGround!
    var hero: JTHero

    override func didMoveToView(view: SKView) {
       backgroundColor = UIColor(red: 159.0/255.0, green: 281.0/255.0, blue: 244.0/255.0, alpha: 1.0)
       movingGround = JTMovingGround(size: CGSizeMake(view.frame.width, 20))
        movingGround.position = CGPointMake(0, view.frame.size.height/2)
        addChild(movingGround)

        hero = JTHero()
        hero.position = CGPointMake(70, movingGround.position.y + movingGround.frame.size.height/2 + hero.frame.height/2)
        addChild(hero)
    }

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
        movingGround.start()
    }

    override func update(currentTime: CFTimeInterval) {
        /* Called before each frame is rendered */
    }
}

谁能告诉我出了什么问题？谢谢

Answer 1

这是因为您有一个没有默认值的非可选属性.

var hero: JTHero

是非可选的,但它也没有价值.

所以,您可以通过执行来使其成为可选项

var hero: JTHero?

或者您可以创建一个init方法并在其中设置值.

或者创建一个默认值......

var hero = JTHero()

有很多方法可以做后者.