调用

        //use
        VersionCheckManager.checkVersion(appId: "836500024") { (compareResult) -> Void in

            DDLogDebug("\n\(compareResult)\n")
        }

封装

import UIKit
import Alamofire

class VersionCheckManager: NSObject {

    // MARK: - check to see if you need to update the version
    // - Parameter appId: application appId
    // - Returns: true : The current version is lower than the store version
    // - false : The current version is equal to or higher than the store version
    static func checkVersion(appId:String,compareResult: @escaping (Bool) -> Void) {

        VersionCheckManager.appSoreVersion(appId: appId) { (appVersion) -> Void in
            let localVersion : String = VersionCheckManager.currentVersion()
            let result : Bool = VersionCheckManager().versionCompare(localVersion: localVersion, appStoreVersion: appVersion)
            compareResult(result)
        }
    }

    // MARK: - get app version on the AppStore
    // - Parameter appId:  application appId
    // - Returns: store version
    static func appSoreVersion(appId:String, handle: @escaping ((String) -> Void)) {
        let urlString = "http://itunes.apple.com/lookup?id=" + appId
        Alamofire.request(urlString, method: .get, parameters: [:])
            .responseJSON { (response) in

                if let value = response.result.value {
                    let appMsgDict:Dictionary = value as? Dictionary ?? [:]
                    let appResultsArray:NSArray = (appMsgDict["results"] as? NSArray)!
                    let appResultsDict:NSDictionary = appResultsArray.lastObject as? NSDictionary ?? ["":""]
                    guard let appStoreVersion = appResultsDict["version"] as? String else {
                        return
                    }
                    handle(appStoreVersion)
                }
        }
    }

    // MARK: - Get the current version well
    // - Returns: current version
    static func currentVersion() -> String {

        guard let localVersion = Bundle.main.infoDictionary!["CFBundleShortVersionString"] as? String else {
            return ""
        }
        return localVersion
    }

    // MARK: - compares the store version number to the current version number
    // - Parameter localVersion: currentVersion  appStoreVersion: appSoreVersion
    // - Returns: The current version is equal to or higher than the store version
   func versionCompare(localVersion:String,appStoreVersion:String) -> Bool {
        if checkSeparat(versionString: localVersion) == "" || checkSeparat(versionString: appStoreVersion) == ""{
            DDLogDebug("\n\("Only support '.''-'/''*'_'delimiter")\n")
            return false
        }
        guard let localVersionArray = cutUpNumber(vString: localVersion) as? [String] else { return false}
        guard let storeVersionArray = cutUpNumber(vString: appStoreVersion) as? [String] else {return false}
        return compareNumber(localArray: localVersionArray, storeArray: storeVersionArray)
    }

    // MARK: - extract link
    // - Parameter  versionString : version
    // - Returns: version
    func checkSeparat(versionString:String) -> String {
        var separated:String = ""
        if versionString.contains(".") {separated = "."}
        if versionString.contains("-") {separated = "-"}
        if versionString.contains("/") {separated = "/"}
        if versionString.contains("*") {separated = "*" }
        if versionString.contains("_") {separated = "_" }

        return separated
    }

    // MARK: - extract each individual version number
    // - Parameter vString: version
    // - Returns: version array
    func cutUpNumber(vString:String) -> NSArray {
        let  separat = checkSeparat(versionString: vString)
        let versionChar = NSCharacterSet(charactersIn:separat) as CharacterSet
        let vStringArr = vString.components(separatedBy: versionChar)
        return vStringArr as NSArray
    }

    // MARK: - compare the store version to the current version
    // - Parameter appId: application appId
    // - Returns: true : The current version is lower than the store version
    // - false : The current version is equal to or higher than the store version
    func compareNumber(localArray:[String],storeArray:[String]) -> Bool {
        for version in 0..<localArray.count {
            if  Int(localArray[version])! != Int(storeArray[version])! {
                if Int(localArray[version])! > Int(storeArray[version])! {
                    return true
                } else {
                    return false
                }
            }
        }
        return false
    }
}