如何隨機選擇一個SKSpriteNode？

Question

我想使用隨機選擇4個敵人並將其呈現在場景中。爲此我做了這個：

func enemyPicker() -> SKSpriteNode { 
    var enemyArray = [mouse, robot, drone, block, bird] 
    var countArray = UInt32(enemyArray.count) 
    var pickOneEneny = arc4random_uniform(countArray) 
    var randomElement = Int(pickOneEnemy) 

    return enemyArray.randomElement 
} 

但Xcode對我說SKSpriteNode does not have a member named randomElement。而且它肯定不會，但是我怎麼會對我的函數說我需要它從數組中挑選並將這個隨機Int分配給實際的敵人？我試過使用this answer，但它不適合我。我也嘗試改變 - > SKSpriteNode SKTexture，字符串和「T」，並沒有任何運氣。

我SpriteNodes聲明，如：

var mouse = SKSpriteNode() 
let mouseAtlas = SKTextureAtlas(named: "mouse") 
var mouseArray = [SKTexture]() 
mouseArray.append(mouseAtlas.textureNamed("mouse_0")); 
mouseArray.append(mouseAtlas.textureNamed("mouse_1")); 
mouseArray.append(mouseAtlas.textureNamed("mouse_2")); 

mouse = SKSpriteNode(texture: mouseArray[0]); 
self.mouse.position = CGPointMake(CGRectGetMaxX(self.frame), CGRectGetMidY(self.frame) - 138) 
self.mouse.size = CGSizeMake(self.mouse.size.width, self.mouse.size.height + mouse.size.height/2) 

self.mouse.name = "mouse" 
self.addChild(mouse) 

Answer 1

func enemyPicker() -> SKSpriteNode { 
    let enemyArray = [mouse, robot, drone, block, bird] 
    return enemyArray[Int(arc4random_uniform(UInt32(enemyArray.count)))] 
}