使用背景
项目中需要使用lottie动画库处理礼物特效相关的流程，通过服务端下发json或者zip ，iOS 的这个
思路 : 礼物管理id文件夹/data.json images 礼物id文件夹 /data.json 来管理 具体原因是lottie-ios下加载json和资源是通过 BundleImageProvider 来加载的 （这块在framwork中有点小缺陷 测试下路径试了相对路径和绝对路径始终有问题 而且json如果是在framewrok中必须放在bundle中，但打包会有问题 才疏学浅有些编译错误是真不好处理）因此客户端管理下特效相关的资源
代码实现
#######下载使用moya 解压使用ZipArchive或者 Zip
//
// LottieResourceManager.swift
// Copyright © 2020 CocoaPods. All rights reserved.
//
import Foundation
import ZipArchive
import Moya
import Lottie
typealias lottieResultBlock = (_ jsonfullpath:String?,_ provider:BundleImageProvider?) -> Void
class LottieResourceManager:NSObject {
let filepath = NSHomeDirectory() + "/Documents/LiveKit/GiftFile"
static let shared = LottieResourceManager()
override init() {
super.init()
if FileManager.default.fileExists(atPath: filepath) {
print("礼物 目录存在")
}
else{
try! FileManager.default.createDirectory(atPath: filepath,
withIntermediateDirectories: true, attributes: nil)
}
print(filepath)
}
/// 加载lottie特效
/// - Parameters:
/// - giftId: 特效id
/// - downloadurl: 特效下载地址
/// - animationresult: 特效 images目录
func loadBundleProvider(_ giftId:Int , _ downloadurl:String ,_ animationresult:@escaping lottieResultBlock ) {
let fullpath = filepath + "/\(giftId)/data.json"
let imgprovider = filepath + "/\(giftId)/images"
var jsonpath:String?=nil
if FileManager.default.fileExists(atPath: fullpath) {
jsonpath = fullpath
if FileManager.default.fileExists(atPath: imgprovider)
{
let provider = BundleImageProvider.init(bundle: Bundle.main, searchPath: imgprovider)
animationresult(jsonpath,provider)
}else{
animationresult(jsonpath,nil)
}
}
//网络下载 并解压
else{
let giftpath = filepath + "/\(giftId)"
let assetName = "\(giftId)"
jsonpath = giftpath + "/data.json"
let urladdress = downloadurl
//通过Moya进行下载
MyServiceProvider.request(.downloadGiftLottie(downloadurl:urladdress,giftDirectoryName: assetName)) { result in
switch result {
case .success:
let localLocation: URL = DefaultDownloadDir.appendingPathComponent(assetName)
print("下载完毕！保存地址：\(localLocation)")
if urladdress.contains(".zip") {
let urlpath = URL.init(fileURLWithPath: self.filepath + "/\(giftId).zip" )
do {
try FileManager.default.createDirectory(atPath: self.filepath + "/\(giftId)", withIntermediateDirectories: true, attributes: nil)
let ziptool = ZipArchive.init()
if ziptool.unzipOpenFile( self.filepath + "/\(giftId).zip") {
let res = ziptool.unzipFile(to: giftpath, overWrite: true)
if !res {
ziptool.unzipCloseFile()
}
}
// let zipurl = try Zip.unzipFile(urlpath, destination: URL.init(fileURLWithPath: giftpath), overwrite: true, password: nil)
//得到正确的资源包 12312/ data images
if FileManager.default.fileExists(atPath: imgprovider)
{
let provider = BundleImageProvider.init(bundle: Bundle.main, searchPath: imgprovider)
animationresult(jsonpath,provider)
}else{
animationresult(jsonpath,nil)
}
// print(zipurl)
} catch (let err) {
print("解压失败")
animationresult(nil,nil)
}
}
else if urladdress.contains(".json") {
do {
try FileManager.default.createDirectory(atPath: self.filepath + "/\(giftId)", withIntermediateDirectories: true, attributes: nil)
try FileManager.default.moveItem(atPath: self.filepath + "/data.json", toPath: giftpath + "/data.json")
animationresult(jsonpath,nil)
// print(zipurl)
} catch (let err) {
debugPrint("文件出错\(err)")
animationresult(nil,nil)
}
}
case let .failure(error):
print(error)
animationresult(nil,nil)
}
}
}
}
}
//MARK:单独组件处理下载
//初始化请求的provider
let MyServiceProvider = MoyaProvider()
//请求分类
public enum DownLoadService {
case downloadGiftLottie(downloadurl:String,giftDirectoryName:String) //下载文件
}
//请求配置
extension DownLoadService: TargetType {
public var path: String {
return ""
}
//服务器地址
public var baseURL: URL {
switch self {
case .downloadGiftLottie(let url , _ ):
return URL.init(string: url)!
default:
return URL(string: "http://www.baidu.com")!
}
}
//请求类型
public var method: Moya.Method {
return .get
}
//请求任务事件（这里附带上参数）
public var task: Task {
switch self {
case .downloadGiftLottie(let downloadurl ,let saveName):
var localLocation: URL!
if downloadurl.contains(".zip") {
localLocation = DefaultDownloadDir.appendingPathComponent(saveName+".zip")
}else if downloadurl.contains(".json") {
localLocation = DefaultDownloadDir.appendingPathComponent("data.json")
}
//
let downloadDestination:DownloadDestination = { _, _ in
return (localLocation, .removePreviousFile) }
return .downloadDestination(downloadDestination)
}
}
//是否执行Alamofire验证
public var validate: Bool {
return false
}
//这个就是做单元测试模拟的数据，只会在单元测试文件中有作用
public var sampleData: Data {
return "{}".data(using: String.Encoding.utf8)!
}
//请求头
public var headers: [String: String]? {
return nil
}
}
//定义下载的DownloadDestination（不改变文件名，同名文件不会覆盖）
private let DefaultDownloadDestination: DownloadDestination = { temporaryURL, response in
return (DefaultDownloadDir.appendingPathComponent(response.suggestedFilename!), [.removePreviousFile])
}
//默认下载保存地址（用户文档目录）
let DefaultDownloadDir: URL = {
return URL(fileURLWithPath: LottieResourceManager.shared.filepath)
}()
使用方式(当然可以基于这个封装更好的使用方式)
LottieResourceManager.shared.loadBundleProvider(123412, "http://file.ds.net.cn:28080/live/unknown/20200701/3C553D07930C3998D667772BF29B8944/3C553D07930C3998D667772BF29B8944.json") {[weak self] (jsonpath, provider) in
guard let `self` = self else {return}
guard let jsonfile = jsonpath else{return}
self.animationView = AnimationView.init(filePath:jsonfile)
if let prov = provider {
self.animationView.imageProvider = prov
}
self.view.addSubview(self.animationView)
self.animationView.frame = CGRect.init(x: 0, y: 0, width: self.view.frame.size.width , height: self.view.frame.size.height)
self.animationView.play()
}