ios - viewDidLoad 中的函数 dataTaskWithRequest 不影响变量

Question

我想填充一个UITableViewController，因此在我的viewDidLoad中我有以下代码:

override func viewDidLoad() {
    let rc = RestCaller()
    rc.get( "events" , authenticate: true) {
        error, data in

        if error != nil {
            print("error")
        }

        let events = JSON( data: data )
        self.events = events["data"].arrayValue
    }

}

这是我的 get 函数:

func get( route: String, authenticate: Bool?, next: (error: NSError?, data: NSData) -> Void )
{
    let request = NSMutableURLRequest( URL: NSURL( string: self.baseUrl + route )! )

    request.HTTPMethod = "GET"
    if authenticate != nil {
        request.addValue( getUserProperty( "USER_TOKEN" ) as! String, forHTTPHeaderField: "usertoken")
        request.addValue( (getUserProperty( "USER_ID" )?.stringValue)!, forHTTPHeaderField: "userid" )
    }

    _ = NSURLSession.sharedSession().dataTaskWithRequest( request ) {
        data, response, error in

        next(error: error, data: data!)

    }.resume()
}

但是在 numberOfRowsInSection 方法中:

return events.count // return 0 

但是如果我在这里打印 self.events:

override func viewDidLoad() {
    ...

        let events = JSON( data: data )
        self.events = events["data"].arrayValue
        print(self.events) // not empty 

    ...

}

我不明白为什么:(

有什么想法吗？谢谢!

Answer 1

您似乎忘记重新加载表格。

override func viewDidLoad() {
let rc = RestCaller()
rc.get( "events" , authenticate: true) {
    error, data in

    if error != nil {
        print("error")
    }

    let events = JSON( data: data )
    self.events = events["data"].arrayValue

    dispatch_async(dispatch_get_main_queue()) { () -> Void in
        self.tableView.reloadData()

    }
}