#06viewDidLoad 客製 App 畫面

先製作漸層背景

//設定背景顏色
func colorBackground(){
//建立顯示漸層顏色的CAGradientLayer物件
let gradientLayer = CAGradientLayer()
//將漸層layer的邊界跟手機view的邊對齊
gradientLayer.frame = view.frame
//設定漸層的顏色
gradientLayer.colors = [
CGColor(red: 25/255, green: 25/255, blue: 1, alpha: 1),
CGColor(red: 125/255, green: 125/255, blue: 1, alpha: 1),
CGColor(red: 250/255, green: 250/255, blue: 1, alpha: 1)
]
//將漸層layer加在view上
view.layer.addSublayer(gradientLayer)

製作一個柯南圖片的func,把它加到背景上

func addImage(moveX:CGFloat,moveY:CGFloat,rotateDegree:CGFloat,scale:CGFloat,alpha:CGFloat){
let koImage = UIImage(named: "kon")
let koImageView = UIImageView(image: koImage)
let oneDegree = CGFloat.pi/180
koImageView.transform = CGAffineTransform.identity.translatedBy(x: moveX, y: moveY).scaledBy(x:scale, y: scale).rotated(by: oneDegree*rotateDegree)
koImageView.alpha = alpha
view.addSubview(koImageView)

因為要製作很多個,所以再新增一個func

func totaladd(){
addImage(moveX: 100, moveY: 500, rotateDegree: 45, scale: 0.3,alpha: 0.8)
addImage(moveX: -90, moveY: 570, rotateDegree: 320, scale: 0.5,alpha: 0.7)
addImage(moveX: 120, moveY: 600, rotateDegree: 330, scale: 0.3,alpha: 0.6)
addImage(moveX: 0, moveY: 430, rotateDegree: 20, scale: 0.7,alpha: 0.6)
addImage(moveX: -80, moveY: 300, rotateDegree: 12, scale: 0.4,alpha: 0.7)
}

SpriteKit Particle File 製造下雪的粒子效果

func snowBlcak(){
//產生SKView物件，利用insertSubview將它加到畫面的底層，成為背景
let skView = SKView(frame: view.frame)
view.insertSubview(skView, at: 0)
skView.allowsTransparency = true//允許透明
//顯示的內容由SKScene控制，因此產生SKScene，從skView呼叫presentScene顯示SKScene的內容
let scene = SKScene(size: skView.frame.size)
skView.presentScene(scene)
//產生SKEmitterNode時傳入MySnowParticle的檔名，產生製造下雪效果的SKEmitterNode，然從再從scene呼叫addChild加入SKEmitterNode，讓scene顯示下雪的粒子效果
let emitterNode = SKEmitterNode(fileNamed: "MySnowParticle")
scene.addChild(emitterNode!)
//SKScene的anchorPoint控制 scene內容呈現的位置，它的型別是 CGPoint，畫面的左下角為 (0, 0)，右上角為 (1, 1)
scene.anchorPoint=CGPoint(x: 0.5, y: 1)
emitterNode?.particleBirthRate = 3//指定一秒發射幾張圖片
emitterNode?.particleLifetime = 4 //停留的時間為幾秒
emitterNode?.particleSpeed = 100 //移動速度
//讓圖不要被擋住清除view&scene原始設定的背景色
scene.backgroundColor = UIColor.clear
view.backgroundColor = UIColor.clear
view.addSubview(skView)
}

最後把製作好的func放在viewDidLoad()裡面

override func viewDidLoad() {
super.viewDidLoad()
colorBackground()
snowBlcak()
totaladd()
view.addSubview(logoImage)
}