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87 lines
3.2 KiB
Swift
87 lines
3.2 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 downloadProgress: Float = 0.0
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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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let boatEndPoint = boatAnimation!.convert(CGPoint(x:view.bounds.midX, y:-view.bounds.midY), toKeypathLayer: LOTKeypath(string: "Boat"))
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let boatStartPoint = boatAnimation!.convert(CGPoint(x:view.bounds.midX, y:view.bounds.midY), toKeypathLayer: LOTKeypath(string: "Boat"))
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let diff = boatStartPoint.y - boatEndPoint.y
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let pointCallBack: LOTPointValueCallback = LOTPointValueCallback { [weak self] (startFrame, endFrame, startPoint, endPoint, interpolatedPoint, interpolatedProgress, currentFrame) -> CGPoint in
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let y = interpolatedPoint.y - (CGFloat(self!.downloadProgress) * diff)
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return CGPoint(x: interpolatedPoint.x, y: y)
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}
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boatAnimation!.setValueCallback(pointCallBack, for: LOTKeypath(string: "Boat.Transform.Position"))
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//Play the first portion of the animation on loop until the animation 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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print("Download finished")
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boatAnimation!.pause()
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boatAnimation!.loopAnimation = false
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boatAnimation!.animationSpeed = 4
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boatAnimation!.play(toProgress: 0.5) {[weak self] (_) in
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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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downloadProgress = Float(totalBytesWritten) / Float(totalBytesExpectedToWrite)
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}
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}
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