Swift fbsdk图形请求后,变量值变为零
我正在用swift写一个项目,我对这门语言相当陌生 我将变量“username”的值设置为我向facebook sdk请求的结果,但在图形请求之后,我的变量值变为零。变量赋值在图形请求本身内部运行良好 这是我的密码Swift fbsdk图形请求后,变量值变为零,swift,variables,fbsdk,Swift,Variables,Fbsdk,我正在用swift写一个项目,我对这门语言相当陌生 我将变量“username”的值设置为我向facebook sdk请求的结果,但在图形请求之后,我的变量值变为零。变量赋值在图形请求本身内部运行良好 这是我的密码 import UIKit import FBSDKCoreKit import FBSDKLoginKit import FBSDKShareKit class SecondViewController: UIViewController { var username :
import UIKit
import FBSDKCoreKit
import FBSDKLoginKit
import FBSDKShareKit
class SecondViewController: UIViewController {
var username : String = "X"
let label = UILabel()
override func viewDidLoad() {
super.viewDidLoad()
FBSDKGraphRequest(graphPath: "/me", parameters: ["Fields" : "name"]).start {
(connection, result, err) in
if err != nil {
print("Failed to start request", err)
return
}
var res = result as? [String : Any]
self.username = (res?["name"] as! String)
print(self.username)
}
print(self.username)
}
}
请求内部的第一个print语句工作正常,但请求外部的第二个print语句打印空行
当我想将标签的文本设置为username变量的值时,也是这样。它在请求内部工作,但没有做任何其他事情 我认为首先要执行登录权限:
loginManager.logIn(withReadPermissions: ["email","public_profile"], from: self) { (FBSDKLoginManagerLoginResult, Error) in
if(Error == nil){
if(FBSDKLoginManagerLoginResult?.isCancelled)!{
SVProgressHUD.showError(withStatus: "You Cancelled To Login With Facebook, \n Try Again Later!")
}else if(FBSDKLoginManagerLoginResult?.token != nil){
SVProgressHUD.showSuccess(withStatus: "Login Successfull")
SVProgressHUD.show(withStatus: loadingText)
if((FBSDKAccessToken.current()) != nil){
FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, email"]).start(completionHandler: { (connection, result, error) -> Void in
if (error == nil){
let resultDic = result as! [String: Any]
let facebookProfileUrl : String! = "http://graph.facebook.com/\((FBSDKLoginManagerLoginResult?.token!.userID)!)/picture?type=large"
var fbId = (FBSDKLoginManagerLoginResult?.token!.userID)! as String
var name = resultDic["name"] as! String
var email = resultDic["email"] as! String
}else{
print(error!.localizedDescription)
}
})
}
}
}
}
由于您的内部代码工作正常,这意味着您在上面的表现很好,我认为它在线程中工作,这意味着您的底部“print(self.username)”首先被打印,然后在块内部的上面被打印
您可以在完成Graph API响应后记录它 我认为首先要执行登录权限:
loginManager.logIn(withReadPermissions: ["email","public_profile"], from: self) { (FBSDKLoginManagerLoginResult, Error) in
if(Error == nil){
if(FBSDKLoginManagerLoginResult?.isCancelled)!{
SVProgressHUD.showError(withStatus: "You Cancelled To Login With Facebook, \n Try Again Later!")
}else if(FBSDKLoginManagerLoginResult?.token != nil){
SVProgressHUD.showSuccess(withStatus: "Login Successfull")
SVProgressHUD.show(withStatus: loadingText)
if((FBSDKAccessToken.current()) != nil){
FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, email"]).start(completionHandler: { (connection, result, error) -> Void in
if (error == nil){
let resultDic = result as! [String: Any]
let facebookProfileUrl : String! = "http://graph.facebook.com/\((FBSDKLoginManagerLoginResult?.token!.userID)!)/picture?type=large"
var fbId = (FBSDKLoginManagerLoginResult?.token!.userID)! as String
var name = resultDic["name"] as! String
var email = resultDic["email"] as! String
}else{
print(error!.localizedDescription)
}
})
}
}
}
}
由于您的内部代码工作正常,这意味着您在上面的表现很好,我认为它在线程中工作,这意味着您的底部“print(self.username)”首先被打印,然后在块内部的上面被打印
您可以在完成Graph API响应后记录它 这是因为它是异步的。如果您在两个打印中添加不同的字符,您会发现第二个将在第一个之前打印。这是因为它是异步的。如果你在两张照片中添加不同的字符,你会发现第二张照片将在第一张之前打印。