91 lines
3.7 KiB
Swift
91 lines
3.7 KiB
Swift
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// ViewController.swift
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// Lottie-Example-Swift
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//
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// Created by brandon_withrow on 1/4/18.
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// Copyright © 2018 brandon_withrow. All rights reserved.
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//
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import UIKit
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import Lottie
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class ViewController: UIViewController, URLSessionDownloadDelegate {
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private var downloadTask: URLSessionDownloadTask?
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private var boatAnimation: LOTAnimationView?
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var positionInterpolator: LOTPointInterpolatorCallback?
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override func viewDidLoad() {
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super.viewDidLoad()
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// Create Boat Animation
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boatAnimation = LOTAnimationView(name: "Boat_Loader")
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// Set view to full screen, aspectFill
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boatAnimation!.autoresizingMask = [.flexibleHeight, .flexibleWidth]
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boatAnimation!.contentMode = .scaleAspectFill
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boatAnimation!.frame = view.bounds
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// Add the Animation
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view.addSubview(boatAnimation!)
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let button = UIButton(type: .system)
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button.setTitle("Start Download", for: .normal)
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button.sizeToFit()
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button.center = view.center
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button.addTarget(self, action: #selector(startDownload(button:)), for: .touchUpInside)
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view.addSubview(button)
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// The center of the screen, where the boat will start
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let screenCenter = CGPoint(x:view.bounds.midX, y:view.bounds.midY)
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// The center one screen height above the screen. Where the boat will end up when the download completes
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let offscreenCenter = CGPoint(x:view.bounds.midX, y:-view.bounds.midY)
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// Convert points into animation view coordinate space.
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let boatStartPoint = boatAnimation!.convert(screenCenter, toKeypathLayer: LOTKeypath(string: "Boat"))
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let boatEndPoint = boatAnimation!.convert(offscreenCenter, toKeypathLayer: LOTKeypath(string: "Boat"))
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// Set up out interpolator, to be driven by the download callback
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positionInterpolator = LOTPointInterpolatorCallback(from: boatStartPoint, to: boatEndPoint)
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// Set the interpolator on the animation view for the Boat.Transform.Position keypath.
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boatAnimation!.setValueDelegate(positionInterpolator!, for:LOTKeypath(string: "Boat.Transform.Position"))
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//Play the first portion of the animation on loop until the download finishes.
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boatAnimation!.loopAnimation = true
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boatAnimation!.play(fromProgress: 0,
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toProgress: 0.5,
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withCompletion: nil)
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}
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@objc func startDownload(button: UIButton) {
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button.isHidden = true
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createDownloadTask()
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}
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func createDownloadTask() {
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let downloadRequest = URLRequest(url: URL(string: "https://upload.wikimedia.org/wikipedia/commons/8/8f/Whole_world_-_land_and_oceans_12000.jpg")!)
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let session = URLSession(configuration: URLSessionConfiguration.default, delegate: self, delegateQueue: OperationQueue.main)
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downloadTask = session.downloadTask(with:downloadRequest)
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downloadTask!.resume()
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}
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func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
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// Pause the animation and disable looping.
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boatAnimation!.pause()
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boatAnimation!.loopAnimation = false
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// Speed up animation to finish out the current loop.
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boatAnimation!.animationSpeed = 4
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boatAnimation!.play(toProgress: 0.5) {[weak self] (_) in
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// At this time the animation is at the halfway point. Reset sped to 1 and play through the completion animation.
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self?.boatAnimation!.animationSpeed = 1
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self?.boatAnimation!.play(toProgress: 1, withCompletion: nil)
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}
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}
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func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
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positionInterpolator?.currentProgress = CGFloat(totalBytesWritten) / CGFloat(totalBytesExpectedToWrite)
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}
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}
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