ios - Why isn't my images popping up when I touch the screen? -

can me, im trying make simple app touch screen , 4 images randomly displayed. problem is, when tap screen don't image have no errors. help!

here's code:

import spritekit  class gamescene: skscene {      var num1 = skspritenode(imagenamed: "num1")     var num2 = skspritenode(imagenamed: "num2")     var num3 = skspritenode(imagenamed: "num3")     var num4 = skspritenode(imagenamed: "num4")      override func didmovetoview(view: skview) {          self.physicsworld.gravity = cgvectormake(0, -9.8)         num1.size = cgsize(width: 150, height: 150)         num2.size = cgsize(width: 150, height: 150)         num3.size = cgsize(width: 150, height: 150)         num4.size = cgsize(width: 150, height: 150)          let scenebody = skphysicsbody(edgeloopfromrect: self.frame)         scenebody.friction = 0         self.physicsbody = scenebody     }      override func touchesbegan(touches: set<uitouch>, withevent event: uievent?) {          touch: anyobject in touches {                 _ = touch.locationinnode(self)              let random = arc4random_uniform(4)              switch random {             case 0:                 self.addchild(num1)                 print("number 0")             case 1:                 self.addchild(num2)                 print("number 1")             case 2:                 self.addchild(num3)                 print("number 2")             default:                 self.addchild(num4)                 print("default")             }         }     } } 

you not setting position each sprite should appear

before each self.addchild(...) should exec this

numx.position = location 

and rearrange touchesbegan method this

override func touchesbegan(touches: set<uitouch>, withevent event: uievent?) {     var location      touch in touches {         location = touch.locationinnode(self)     }      let random = arc4random_uniform(4)      switch random {     case 0:         num1.position = location         self.addchild(num1)         print("number 0")     case 1:         num2.position = location         self.addchild(num2)         print("number 1")     case 2:         num3.position = location         self.addchild(num3)         print("number 2")     default:         num4.position = location         self.addchild(num4)         print("default")     }  }