ios - Creating raining code Matrix effect -


created sub class of catextlayer within attached fadein animation, add catextlayer have attached dropthru animation. goal try , create matrix movie raining code effect. works reasonably fact surely drives ground, suspect cause keep adding more , more layers. how can detect when layer had left screen may delete it.

here code...

class catextsublayer: catextlayer, caanimationdelegate {      private var starter:float!     private var ender:float!     required override init(layer: any) {     super.init(layer: layer)     //uifont.availablefonts()     self.string = randomstring(length: 1)     self.backgroundcolor = uicolor.black.cgcolor     self.foregroundcolor = uicolor.white.cgcolor     self.alignmentmode = kcaalignmentcenter     self.font = ctfontcreatewithname("avenirnextcondensed-bolditalic" cfstring?, fontsize, nil)     self.fontsize = 16     self.opacity = 0.0     makefade() }  required init?(coder adecoder: nscoder) {     super.init(coder: adecoder)     fatalerror("init(coder:) has not been implemented")  }  func randomstring(length: int) -> string {      let letters : nsstring = "abcdefghijklmnopqrstuvwxyz0123456789"     let len = uint32(letters.length)      var randomstring = ""     _ in 0 ..< length {         let rand = arc4random_uniform(len)         var nextchar = letters.character(at: int(rand))         randomstring += nsstring(characters: &nextchar, length: 1) string     }      return randomstring }  func makefade() {         let rands = double(arc4random_uniform(uint32(4)))         let fadeinandout = cabasicanimation(keypath: "opacity")         fadeinandout.duration = 16.0;         fadeinandout.repeatcount = 1         fadeinandout.fromvalue = 0.0         fadeinandout.tovalue = 1         fadeinandout.isremovedoncompletion = true         fadeinandout.fillmode = kcafillmodeforwards;         fadeinandout.delegate = self         fadeinandout.begintime = cacurrentmediatime() + rands         self.add(fadeinandout, forkey: "opacity")  }  func animationdidstop(_ anim: caanimation, finished flag: bool) {     self.removeallanimations() } }

with outer loop/view controller ..

class viewcontroller: uiviewcontroller, caanimationdelegate {  var beeb: catextsublayer! var meeb: catextlayer! var lines = [int]()  override func viewdidload() {     super.viewdidload()     view.backgroundcolor = uicolor.black         // additional setup after loading view, typically nib.     meeb = catextlayer()     bing in stride(from:0, to: int(view.bounds.width), by: 16) {         lines.append(bing)     }     _ in 0 ..< 9 {         timer.scheduledtimer(timeinterval: 0.5, target: self, selector: #selector(makebeeb), userinfo: nil, repeats: true)     } }  func makebeeb() {     let rands = double(arc4random_uniform(uint32(4)))     let beeb = catextsublayer(layer: meeb)     let randx = int(arc4random_uniform(uint32(lines.count)))     let monkey = lines[randx]     beeb.frame = cgrect(x: monkey, y: 0, width: 16, height: 16)     let dropthru = cabasicanimation(keypath: "position.y")     dropthru.duration = 12.0;     dropthru.repeatcount = 1     dropthru.fromvalue = 1     dropthru.tovalue = view.bounds.maxy     dropthru.isremovedoncompletion = true     dropthru.fillmode = kcafillmodeforwards;     dropthru.begintime = cacurrentmediatime() + rands     dropthru.delegate = self     beeb.add(dropthru, forkey: "position.y")     self.view.layer.addsublayer(beeb) }  func animationdidstop(_ anim: caanimation, finished flag: bool) {     self.view.layer.removeallanimations() }  override func didreceivememorywarning() {     super.didreceivememorywarning()     // dispose of resources can recreated. }   }

as far understand code can remove layer, when it's position animation ends. in moment should have left bounds of parent view.

btw. removing , adding layers costs performance. instead removing should reuse layer next animation.


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