swift3 - Swift 3 SpriteKit Detecting Contacts -


i'm new swift , have been trying figure out how use bitmasks , didbegin(_ contact: skphysicscontact) detect when 2 spaceships touch each other. can't seem figure out how.

here have far: 

import spritekit import gameplaykit  class gamescene: skscene, skphysicscontactdelegate {  let puffercategory: uint32 = 1 << 0;  let enemycategory: uint32 = 1 << 1;  var spaceship1: skspritenode! var spaceship2: skspritenode!  override func didmove(to view: skview) {     spaceship1 = skspritenode(imagenamed: "spaceship");     spaceship1.setscale(cgfloat(0.1))     spaceship1.position = cgpoint(x: self.frame.width / 2, y: (self.frame.height / 2));     spaceship1.name = "spaceship1";       spaceship1.physicsbody = skphysicsbody(circleofradius: spaceship1.size.width / 2);     spaceship1.physicsbody?.isdynamic = true // apply gravity, friction, , collision     spaceship1.physicsbody?.affectedbygravity = false;     spaceship1.physicsbody?.allowsrotation = false     spaceship1.physicsbody = skphysicsbody(circleofradius: spaceship1.size.width / 2);     spaceship1.physicsbody?.categorybitmask = puffercategory     spaceship1.physicsbody?.contacttestbitmask = enemycategory      spaceship2 = skspritenode(imagenamed: "spaceship");     spaceship2.setscale(cgfloat(0.1))     spaceship2.position = cgpoint(x: self.frame.width / 2, y: (spaceship1.position.y + 300));     spaceship2.name = "puffer2";      spaceship2.physicsbody = skphysicsbody(circleofradius: spaceship2.size.width / 2);     spaceship2.physicsbody?.isdynamic = true // apply gravity, friction, , collision     spaceship2.physicsbody?.affectedbygravity = false;     spaceship2.physicsbody?.allowsrotation = false     spaceship2.physicsbody = skphysicsbody(circleofradius: spaceship2.size.width / 2);     spaceship2.physicsbody?.categorybitmask = enemycategory     spaceship2.physicsbody?.contacttestbitmask = puffercategory      addchild(spaceship1)     addchild(spaceship2) }  func didbegin(_ contact: skphysicscontact) {     print("contact") }      override func update(_ currenttime: timeinterval) {         spaceship1.physicsbody?.affectedbygravity = false;   } }

thanks in advance!

i figured out!

here's code :)

import spritekit import gameplaykit  class gamescene: skscene, skphysicscontactdelegate {  let enemy2category: uint32 = 1  let enemycategory: uint32 = 2  var spaceship1: skspritenode! var spaceship2: skspritenode!  override func didmove(to view: skview) {     self.physicsworld.contactdelegate = self     spaceship1 = skspritenode(imagenamed: "spaceship");     spaceship1.setscale(cgfloat(0.1))     spaceship1.position = cgpoint(x: self.frame.width / 2, y: (self.frame.height / 2));     spaceship1.name = "spaceship1";       spaceship1.physicsbody = skphysicsbody(circleofradius: spaceship1.size.width / 2);     spaceship1.physicsbody?.isdynamic = true // apply gravity, friction, , collision     spaceship1.physicsbody?.affectedbygravity = false;     spaceship1.physicsbody?.allowsrotation = false     spaceship1.physicsbody = skphysicsbody(circleofradius: spaceship1.size.width / 2);     spaceship1.physicsbody?.categorybitmask = enemy2category     spaceship1.physicsbody?.collisionbitmask = enemycategory     spaceship1.physicsbody?.contacttestbitmask = enemycategory      spaceship2 = skspritenode(imagenamed: "spaceship");     spaceship2.setscale(cgfloat(0.1))     spaceship2.position = cgpoint(x: self.frame.width / 2, y: (spaceship1.position.y + 300));     spaceship2.name = "spaceship2";      spaceship2.physicsbody = skphysicsbody(circleofradius: spaceship2.size.width / 2);     spaceship2.physicsbody?.isdynamic = true // apply gravity, friction, , collision     spaceship2.physicsbody?.affectedbygravity = false;     spaceship2.physicsbody?.allowsrotation = false     spaceship2.physicsbody = skphysicsbody(circleofradius: spaceship2.size.width / 2);     spaceship2.physicsbody?.categorybitmask = enemycategory     spaceship2.physicsbody?.collisionbitmask = enemy2category     spaceship2.physicsbody?.contacttestbitmask = enemy2category      addchild(spaceship1)     addchild(spaceship2) }   func didbegin(_ contact: skphysicscontact) {     print("contact") }      override func update(_ currenttime: timeinterval) {         spaceship1.physicsbody?.affectedbygravity = false;    } }

i used video help: https://www.youtube.com/watch?v=43hzb4nmqfw


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