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@vtourraine
Created August 23, 2018 08:37
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View with clouds floating by.
//
// CloudsView.swift
//
// Swift 4.2
//
import UIKit
@available(iOS 10.0, *)
class CloudsView: UIView {
static let SpawnTimeInterval: TimeInterval = 10
static let HorizontalRandomMaxOverflow: CGFloat = 200
static let CloudSize: CGSize = CGSize(width: 84, height: 54)
static let AnimationDuration: TimeInterval = 50
var animationTimer: Timer?
func startAnimation() {
guard animationTimer == nil else {
return
}
spawnBunchOfCloudsInTheSky()
spawnCloudFromTheSide()
animationTimer = Timer.scheduledTimer(withTimeInterval: CloudsView.SpawnTimeInterval, repeats: true) { (timer) in
self.spawnCloudFromTheSide()
}
}
override func removeFromSuperview() {
super.removeFromSuperview()
if let animationTimer = animationTimer {
animationTimer.invalidate()
}
}
func spawnBunchOfCloudsInTheSky() {
let InitialNumberOfClouds = Int.random(in: 2...3)
for _ in 0..<InitialNumberOfClouds {
spawnCloudInTheSky()
}
}
func spawnCloudInTheSky() {
spawnCloud(x: CGFloat.random(in: 0..<self.bounds.size.width))
}
func spawnCloudFromTheSide() {
spawnCloud(x: CGFloat.random(in: -CloudsView.HorizontalRandomMaxOverflow..<0))
}
func spawnCloud(x: CGFloat) {
let y = CGFloat.random(in: (CloudsView.CloudSize.height / 2)..<(self.bounds.size.height - CloudsView.CloudSize.height / 2))
spawnCloud(origin: CGPoint(x: x, y: y))
}
func spawnCloud(origin: CGPoint) {
let imageView = UIImageView(image: UIImage(named: "Cloud"))
imageView.tintColor = .white
imageView.alpha = 0.7
imageView.frame = CGRect(origin: .zero, size: CloudsView.CloudSize)
imageView.center = origin
addSubview(imageView)
let boundsWidth = self.bounds.size.width
UIView.animate(withDuration: CloudsView.AnimationDuration, delay: 0, options: .curveLinear, animations: {
imageView.center = CGPoint(x: origin.x + boundsWidth + CloudsView.CloudSize.width + CloudsView.HorizontalRandomMaxOverflow, y: origin.y)
}) { (completed) in
if completed {
imageView.removeFromSuperview()
}
}
}
}
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