我的部分动画在 SpriteKit 中不起作用

Posted 2023-02-15

【中文标题】我的部分动画在 SpriteKit 中不起作用

【英文标题】：Part of my animation is not working in SpriteKit

【发布时间】：2022-01-21 01:36:25

【问题描述】：

init () 
    
    super.init(texture: nil, color: .clear, size: initialSize)
    // Create physicsBody based on a frame of the sprite
    // basically giving it gravity and physics components
    let bodyTexture = textureAtlas.textureNamed("MainCharacterFlying1")
    self.physicsBody = SKPhysicsBody(texture: bodyTexture, size: self.size)
    // Lose momentum quickly with high linear dampening
    self.physicsBody?.linearDamping = 0.9
    // weighs around 30 kg
    self.physicsBody?.mass = 30
    // no rotation
    self.physicsBody?.allowsRotation = false
    createAnimations()
    self.run(soarAnimation, withKey: "soarAnimation")



// Animations to make the main character seem like it is flying
func createAnimations() 
    let rotateUpAction = SKAction.rotate(byAngle: 0, duration: 0.475)
    rotateUpAction.timingMode = .easeOut
    
    let rotateDownAction = SKAction.rotate(byAngle: -1, duration: 0.8)
    rotateDownAction.timingMode = .easeIn
    
    let flyFrames: [SKTexture] = [textureAtlas.textureNamed("MainCharacterFlying1"), textureAtlas.textureNamed("MainCharacterFlying2"),textureAtlas.textureNamed("MainCharacterFlying3"), textureAtlas.textureNamed("MainCharacterFlying4"),textureAtlas.textureNamed("MainCharacterFlying5"),textureAtlas.textureNamed("MainCharacterFlying4"),textureAtlas.textureNamed("MainCharacterFlying3"),textureAtlas.textureNamed("MainCharacterFlying2")]
    var flyAction = SKAction.animate(with: flyFrames, timePerFrame: 0.1)
    flyAction = SKAction.repeatForever(flyAction)
    flyAnimation = SKAction.group([flyAction,rotateUpAction])
    
    let soarFrames: [SKTexture] = [textureAtlas.textureNamed("MainCharacterFlying5")]
    var soarAction = SKAction.animate(with: soarFrames, timePerFrame: 1)
    soarAction = SKAction.repeatForever(soarAction)
    let soarAnimation = SKAction.group([soarAction,rotateDownAction])

当我在 ios 模拟器上运行此代码时，我必须在屏幕上单击一次才能让我的主精灵出现在屏幕上，否则它不会出现。当我点击精灵时，精灵将开始拍打翅膀并上升（我有其他代码）但是，rotateUpAction 和 rotateDownAction 根本没有出现在模拟器上。所以我想知道是否有任何解决方案以及愿意回答的人。 感谢您的时间。 另外，这段代码来自主角的类，类名是“玩家”

【参考方案1】：

你声明let soarAnimation在你的createAnimations函数，这意味着当你调用self.run(soarAnimation)时它不在作用域内。解决方案：将soarAnimation 声明为类属性。替代解决方案：让createAnimations() 返回 SKAction 并以这种方式在 init 中获取它