我正在尝试返回结果并能够从此函数访问结果数组。函数中的一切都正常工作,但是我无法返回任何内容或访问结果或从闭包外部在函数内部创建的任何变量。我想从闭包外部访问 result.valueForKey("id") 。我怎样才能做到这一点?
class ViewController: UIViewController, FBSDKLoginButtonDelegate {
var facebookid: NSString = ""
var username: NSString = ""
var userEmail:NSString = ""
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
if (FBSDKAccessToken.currentAccessToken() == nil)
{
let loginView : FBSDKLoginButton = FBSDKLoginButton()
self.view.addSubview(loginView)
loginView.center = self.view.center
loginView.readPermissions = ["public_profile"]
loginView.delegate = self
} else {
returnUserData()
println(facebookid) // This doesn't work
}
}
func returnUserData()
{
let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: nil)
graphRequest.startWithCompletionHandler({ (connection, result, error) -> Void in
if ((error) != nil)
{
// Process error
println("Error: \(error)")
}
else
{
self.facebookid = result.valueForKey("id") as NSString!
self.username = result.valueForKey("name") as NSString!
self.userEmail = result.valueForKey("email") as NSString!
println(result) // This works
}
})
}
编辑:我确实根据下面的两个答案更改了代码,但仍然无法在 viewDidLoad 闭包上获得任何数据返回。
* println(facebookid) 不会在 ViewDidLoad 中返回任何内容,而它会在函数的闭包内返回任何内容。
您正在闭包内部创建变量,这意味着它们只能在内部访问。
您需要在类顶部的函数外部创建变量。
例如
class YourClassName {
var facebookid
var username
var userEmail
func returnUserData()
{
let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: nil)
graphRequest.startWithCompletionHandler({ (connection, result, error) -> Void in
if ((error) != nil)
{
// Process error
println("Error: \(error)")
}
else
{
self.facebookid = result.valueForKey("id") as? String
self.userName = result.valueForKey("name") as? String
self.userEmail = result.valueForKey("email") as? String
}
})
}
}
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