从闭包中获取变量的值 swift

Question

所以我有一个名为 task 的闭包，它是一个 post 请求，我有一个名为 values 的全局变量，我试图将 "values" 的值设置为我从存储在名为 "array" 的变量中的数据库中检索回来。不要担心 tableview.reloadData 部分，它已经完成了。我只想知道如何从闭包中获取价值。

var values:NSArray = []

@IBOutlet weak var Open: UIBarButtonItem!
override func viewDidLoad() {
    super.viewDidLoad()


    Open.target = self.revealViewController()
    Open.action = #selector(SWRevealViewController.revealToggle(_:))
    self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
    get()
    print ("values=\(values)")

}
func get(){       
    let request = NSMutableURLRequest(URL: NSURL(string: "http://www.percyteng.com/orbit/getAllpostsTest.php")!)
    request.HTTPMethod = "POST"
    let postString = "user=\("ios")"
    request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)
    let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
        data, response, error in
        if error != nil {

            print("error=\(error)")
            return
        }

        print("response = \(response)")

        let array = try! NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSArray

        dispatch_async(dispatch_get_main_queue()) { [unowned self] in
            self.values = array
            print ("error=\(self.values)")
            self.tableView?.reloadData();
        }
    }
    task.resume()

Answer 1

对闭包中的任何异步任务使用完成

func get(completion:(value: NSArray) -> Void){

    // request part
    let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
        data, response, error in
        // your serialization code

        dispatch_async(dispatch_get_main_queue()) { [unowned self] in
            self.values = array

            // return value to completion
            completion(value: array)

            print ("error=\(self.values)")
            self.tableView?.reloadData();
        }
    }
}

更改在 viewdidload 中获取值的方式

   get{(value) in
       // finish NSURLSession task and everything should be done in this closure
        self.values = value
        print ("values=\(self.values)")
    }

从闭包中获取变量的值 swift

get the value of variable out of closure swift

closures

http-post

ios

nsurlsession

swift