ios - Swift 如何关闭 Facebook 图 block

Question

我想要，但我不知道如何 =(，关闭我的 Facebook 图表 block

我的问题是，我想将用户 facebook 的用户名保存在变量中以便稍后使用(另一个 View Controller )，但我不能，因为在我尝试保存数据后我的 block 已关闭。

这是我的委托(delegate)函数:

    // Facebook Delegate Methods
    func loginButton(connection: FBSDKLoginButton!, didCompleteWithResult result: FBSDKLoginManagerLoginResult!, error: NSError!) {

        if (error != nil)
        {
            println("Error")
        }
        else {
            println("User logged in")
            self.returnUserData()
        }
    }

这是我使用 facebook graph api 的函数

// Here my block that I want to close, maybe with completion closure inside
    func returnUserData()
    {
        let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, picture.type(large), email"])
        // Launch asynchronous function
        var userName : String = "error"
        graphRequest.startWithCompletionHandler({ (connection, result, error) -> Void in

            if ((error) != nil)
            {
                // Process error
                println("Error: \(error)")
            }
            else
            {
                println(result)
                userName = result["first_name"] as! String
            }
        })
    }

有人可以帮我吗？

Answer 1

看一下这个示例，您可以将变量设置在闭包范围之外，然后要求它在设置值时执行特定的函数，如下所示:

import UIKit

class ViewController: UIViewController {

var myString : String = "123" {

    didSet {

        self.stringUpdated()
    }

}

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    myString = "456" // this would take place in your graph request closure
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func stringUpdated() {

    println("got it, string is \(myString)")
}


}