这节内容我们来实现熊猫的二段跳。
要点：
二段跳的逻辑：
逻辑一，第一次点击屏幕，status就会变成jump。
逻辑二，第二次点击屏幕，status就会变成jump2。
逻辑三，当status变成jump2的时候不响应屏幕点击
逻辑四，当熊猫落地时将status变为run。
所以只要当status的不等于jump2的时候，点击屏幕都会给熊猫施加一个向上的速度。这时候判断。如果是一段跳就将status设为jump。如果是二段跳就将status设为jump2。落地改变状态之前已经写好了。
二段跳的实现：
func jump (){
self.removeAllActions()
if status != Status.jump2 {
self.runAction(SKAction.animateWithTextures(jumpFrames, timePerFrame: 0.05),withKey:"jump")
self.physicsBody.velocity = CGVectorMake(, )
if status == Status.jump {
status = Status.jump2
}else{
status = Status.jump
}
}
}
整体代码：
import SpriteKit
enum Status:Int{
case run=,jump,jump2,roll;
}
class Panda : SKSpriteNode {
let runAtlas = SKTextureAtlas(named: "run.atlas")
let runFrames = [SKTexture]()
let jumpAtlas = SKTextureAtlas(named: "jump.atlas")
let jumpFrames = [SKTexture]();
let rollAtlas = SKTextureAtlas(named: "roll.atlas")
let rollFrames = [SKTexture]();
var status = Status.run
init(){
let texture = runAtlas.textureNamed("panda_run_01")
let size = texture.size()
super.init(texture:texture,color:SKColor.whiteColor(),size:size)
var i:Int
for i= ; i<=runAtlas.textureNames.count ; i++ {
let tempName = String(format: "panda_run_%.2d", i)
let runTexture = runAtlas.textureNamed(tempName)
if runTexture {
runFrames.append(runTexture)
}
}
for i= ; i<=jumpAtlas.textureNames.count ; i++ {
let tempName = String(format: "panda_jump_%.2d", i)
let jumpTexture = jumpAtlas.textureNamed(tempName)
if jumpTexture {
jumpFrames.append(jumpTexture)
}
}
for i= ; i<=rollAtlas.textureNames.count ; i++ {
let tempName = String(format: "panda_roll_%.2d", i)
let rollTexture = rollAtlas.textureNamed(tempName)
if rollTexture {
rollFrames.append(rollTexture)
}
}
self.physicsBody = SKPhysicsBody(rectangleOfSize: texture.size())
self.physicsBody.dynamic = true
self.physicsBody.allowsRotation = false
//摩擦力
self.physicsBody.restitution =
self.physicsBody.categoryBitMask = BitMaskType.panda
self.physicsBody.contactTestBitMask = BitMaskType.scene | BitMaskType.platform
self.physicsBody.collisionBitMask = BitMaskType.platform
run()
}
func run(){
self.removeAllActions()
self.status = .run
self.runAction(SKAction.repeatActionForever(SKAction.animateWithTextures(runFrames, timePerFrame: 0.05)))
}
func jump (){
self.removeAllActions()
if status != Status.jump2 {
self.runAction(SKAction.animateWithTextures(jumpFrames, timePerFrame: 0.05),withKey:"jump")
self.physicsBody.velocity = CGVectorMake(, )
if status == Status.jump {
status = Status.jump2
}else{
status = Status.jump
}
}
}
func roll(){
self.removeAllActions()
status = .roll
self.runAction(SKAction.animateWithTextures(rollFrames, timePerFrame: 0.05),completion:{() in self.run()})
}
}项目文件地址
http://yun.baidu.com/share/link?shareid=3824235955&uk=541995622