最近剛剛學了Swift，然后就用Swift做了一個公司的項目。中途也算是曲折不斷了。實話說，Swift真的好用，現在的我已經不想再用oc做開發，我覺代替oc也就是一兩年的事吧！廢話不多說，切入正題。

1.獲取已經上架的App版本信息（騰訊QQ為例）
2.與當前安裝的版本作比較
3.決定是否要跳轉到App Store 進行下載

以下是我參照的一個前輩的OC版本進行修改的

        let url = "http://itunes.apple.com/cn/lookup?id=444934666"
        postpath(url)

func postpath(path: String) {
        let url = NSURL(string: path)
        let request = NSMutableURLRequest(URL: url!, cachePolicy: .ReloadIgnoringCacheData, timeoutInterval: 10)
        request.HTTPMethod = "POST"
        let queue = NSOperationQueue()
        NSURLConnection.sendAsynchronousRequest(request, queue: queue) { (response, data, error) in
            var receiveStatusDic = [String: AnyObject]()
            if data != nil {
                var receiveDic = [String: AnyObject]()
                do {
                    receiveDic = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableLeaves) as! [String : AnyObject]
                } catch {
                    print(error)
                }
                
                if receiveDic["resultCount"]?.integerValue > 0 {
                    receiveStatusDic["status"] = "1"
                    
                } else {
                    receiveStatusDic["status"] = "-1"
                }
            } else {
                receiveStatusDic["status"] = "-1"
            }
            self.performSelectorOnMainThread(#selector(ViewController.receiveData(_:)), withObject: receiveStatusDic, waitUntilDone: false)
        }
        
    }

func receiveData(sender: [String: AnyObject]) {
        print("receiveData=\(sender)")
        let infoDictionary = NSBundle.mainBundle().infoDictionary
        // app版本
        let app_Version = infoDictionary!["CFBundleShortVersionString"] as? String
        if app_Version != (sender["version"] as? String) {
            let alert = UIAlertController(title: "提示", message: "版本有更新", preferredStyle: .Alert)
            let action_sure = UIAlertAction(title: "更新", style: .Default) { (action) in
                let url = NSURL(string: "https://itunes.apple.com/cn/app/qq-2011/id444934666?mt=8")
                UIApplication.sharedApplication().openURL(url!)
            }
            let action_cancel = UIAlertAction(title: "取消", style: .Cancel, handler: nil)
            alert.addAction(action_sure)
            alert.addAction(action_cancel)
            
            presentViewController(alert, animated: true, completion: nil)
            
        }
        
        
    }

最后給大家一個swift和oc代碼互轉的網頁，我在stack overflow交流問題的時候熱心的網友給的。（轉化中還是有些小問題吧，不過可以用的?。?a target="_blank" rel="nofollow">https://objectivec2swift.com/#/home/converter/