フェードイン アニメーションをアタッチした CATextLayer のサブクラスを作成し、ドロップスルー アニメーションをアタッチした CATextLayer に追加しました。マトリックス ムービー レイニング コード エフェクトを試して作成することが目標です。かなりうまく機能しますが、ゆっくりと、しかし確実に地面に押し込まれるという事実のために、私はますます多くのレイヤーを追加し続けているのではないかと思います. レイヤーが画面から離れたときを検出して削除できるようにするにはどうすればよいですか。
これがコードです...
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" as 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 = ""
for _ in 0 ..< length {
let rand = arc4random_uniform(len)
var nextChar = letters.character(at: Int(rand))
randomString += NSString(characters: &nextChar, length: 1) as 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()
}
}
外側のループ/View Controller で ..
class ViewController: UIViewController, CAAnimationDelegate {
var beeb: CATextSubLayer!
var meeb: CATextLayer!
var lines = [Int]()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.black
// Do any additional setup after loading the view, typically from a nib.
meeb = CATextLayer()
for bing in stride(from:0, to: Int(view.bounds.width), by: 16) {
lines.append(bing)
}
for _ 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 any resources that can be recreated.
}
}