Ios 如何将UIViewController作为参数swift 3传递?
我正在尝试创建一个通用方法,我必须将self(当前UIViewController)作为参数传递给它。方法如下:Ios 如何将UIViewController作为参数swift 3传递?,ios,swift,swift3,uiviewcontroller,Ios,Swift,Swift3,Uiviewcontroller,我正在尝试创建一个通用方法,我必须将self(当前UIViewController)作为参数传递给它。方法如下: func getFBUserData(){ if let token = FBSDKAccessToken.current(){ print("Access Token: \(token.tokenString!)") FBSDKGraphRequest(graphPath: "me", parameters: ["f
func getFBUserData(){
if let token = FBSDKAccessToken.current(){
print("Access Token: \(token.tokenString!)")
FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, picture.type(large), email"]).start(completionHandler: { (connection, result, error) -> Void in
if (error == nil){
self.dict = result as! [String : AnyObject]
print(result!)
print(self.dict)
var jsonObj = JSON(result!)
if let first_name = jsonObj["first_name"].string {
NSLog("first_name : \(first_name)")
}
NSLog("RESULT JSON : \(JSON(result!))")
//print("Access Token: \(FBSDKAccessToken.current())")
}
})
}
}
我修改如下:
func IsFaceBookPermisssionGranted(_ completion: @escaping (_ IsPermissionGranted: Bool, _ error_type:ErrorType)->()) {
let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
fbLoginManager.logIn(withReadPermissions: ["email"], from: UIViewController?) { (result, error) in
if (error == nil){
let fbloginresult : FBSDKLoginManagerLoginResult = result!
if fbloginresult.grantedPermissions != nil {
if(fbloginresult.grantedPermissions.contains("email"))
{
completion(true,nil)
}
}else{
completion(false,.AUTH_FAILED)
}
}else{
print("Error : \(error)")
completion(false,.AUTH_FAILED)
}
}
}
但当我通过上面的UIViewController时,它会说
无法将“UIViewController.type”类型的值转换为预期的参数类型“UIViewController!”
对此我能做些什么?在swift 3.0中, 不能直接传递UIViewController。 首先,可以创建视图控制器对象 比如说,
let storyBoard = UIStoryboard.init(name: "Main", bundle: nil)
let yourVC = self.storyboard?.instantiateViewController(withIdentifier: "your_view_controller_Identifier") as! YourViewController
尝试UIViewController.self只需尝试使用self。而不是UIViewController?,传递ViewController对象,在您的情况下,该对象将是
self
。最好创建当前视图控制器的弱引用,然后传递它以避免强引用weak-var-weakself=self-fbLoginManager.logIn(使用readpermissions:[“email”],from:weakself)
isfacebookpermissiongrated(uu-completion:)创建的此方法在哪里,是否在单独的类中?或者在UIViewController子类中?@NiravD我在viewController中调用它。但是我想在一个普通类中创建这个方法。通过在ViewController中启动该类,我想调用此方法。