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Can't get variable in ViewController

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0

0

I want to get the ViewController variable From AppDelegate, I tried :

//1.
print(ViewController().strName)

//2.
let vc = ViewController()
print(vc.strName)

//3.
let vc = UIApplication.shared.keyWindow!.rootViewController as! ViewController
print(vc.strName)

All not working, the print value is empty...

The code in ViewController:

var strName : String = ""
override func viewDidLoad() 

 strName = "Tom"

xcode swift4 appdelegate

share|improve this question

edited Mar 25 at 2:46

Edem

asked Mar 22 at 4:31

EdemEdem

124

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Can you share you ViewController class?
  
  – Rakesha Shastri
  Mar 22 at 5:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Any answer work for you? If not plz share your ViewController Code for more information.
  
  – jogshardik
  Mar 23 at 4:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry reply too late. The code in ViewController is updated! Thanks. And the "print(...)" code actually is in notification but it doesn't matter right?
  
  – Edem
  Mar 25 at 2:44
  
  

  
  
  
  

add a comment | 

0

0

I want to get the ViewController variable From AppDelegate, I tried :

//1.
print(ViewController().strName)

//2.
let vc = ViewController()
print(vc.strName)

//3.
let vc = UIApplication.shared.keyWindow!.rootViewController as! ViewController
print(vc.strName)

All not working, the print value is empty...

The code in ViewController:

var strName : String = ""
override func viewDidLoad() 

 strName = "Tom"

xcode swift4 appdelegate

share|improve this question

edited Mar 25 at 2:46

Edem

asked Mar 22 at 4:31

EdemEdem

124

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Can you share you ViewController class?
  
  – Rakesha Shastri
  Mar 22 at 5:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Any answer work for you? If not plz share your ViewController Code for more information.
  
  – jogshardik
  Mar 23 at 4:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry reply too late. The code in ViewController is updated! Thanks. And the "print(...)" code actually is in notification but it doesn't matter right?
  
  – Edem
  Mar 25 at 2:44
  
  

  
  
  
  

add a comment | 

I want to get the ViewController variable From AppDelegate, I tried :

//1.
print(ViewController().strName)

//2.
let vc = ViewController()
print(vc.strName)

//3.
let vc = UIApplication.shared.keyWindow!.rootViewController as! ViewController
print(vc.strName)

All not working, the print value is empty...

The code in ViewController:

var strName : String = ""
override func viewDidLoad() 

 strName = "Tom"

xcode swift4 appdelegate

share|improve this question

edited Mar 25 at 2:46

Edem

asked Mar 22 at 4:31

EdemEdem

124

//1.
print(ViewController().strName)

//2.
let vc = ViewController()
print(vc.strName)

//3.
let vc = UIApplication.shared.keyWindow!.rootViewController as! ViewController
print(vc.strName)

var strName : String = ""
override func viewDidLoad() 

 strName = "Tom"

share|improve this question

edited Mar 25 at 2:46

Edem

asked Mar 22 at 4:31

EdemEdem

124

share|improve this question

edited Mar 25 at 2:46

Edem

asked Mar 22 at 4:31

EdemEdem

124

asked Mar 22 at 4:31

EdemEdem

124

asked Mar 22 at 4:31

EdemEdem

124

2 Answers
2

active

oldest

votes

0

I suggest to have a check in this link Swift: How to access in AppDelegate variable from the View controller?
else try in view controller,

class ViewController: UIViewController 

 var strName = "someString" // some value

In AppDelegate,

 var mainViewController = ViewController()

func applicationWillEnterForeground(_ application: UIApplication) 
 _ = self.window?.rootViewController as? ViewController
 print(mainViewController.strName)

share|improve this answer

edited Mar 25 at 6:02

answered Mar 22 at 4:52

AzeTechAzeTech

10929

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This has a error message at "let viewController = self.window?.rootViewController as? ViewController"
  
  – Edem
  Mar 25 at 2:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Edem, just try now the edited (or)section
  
  – AzeTech
  Mar 25 at 5:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Edem, check the edited answer now, check whether u have navigation controller in view controller.... I have tried its working and I can print the value in appdelegate (or else try this is did finish launch section in app delegate )
  
  – AzeTech
  Mar 25 at 6:10
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, no error message, but still get empty value....
  
  – Edem
  Mar 25 at 6:56
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Oh Yeh.......... I know, thank you a lot.
  
  – Edem
  Mar 25 at 9:17
  

  
  
  
  

 | 
show 4 more comments

0

First you need to set the storyboard identifier in interface builder

Than you have to your initiate your viewcontroller object using following code.

 let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
 let viewcontroller = storyboard.instantiateViewController(withIdentifier: "ViewController") as? ViewController

Here you can change storyboard name according to your storyboard name.
After you got the controller object you can use easily find your viewcontroller variable.

share|improve this answer

answered Mar 22 at 4:55

jogshardikjogshardik

8531920

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why bring storyboards into it? You're adding complexity where it's not needed.
  
  – Caleb
  Mar 22 at 6:11
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This has an error at "class AppDelegate: UIResponder, UIApplicationDelegate,UNUserNotificationCenterDelegate {", it's shows " Thread 1: signal SIGABRT".
  
  – Edem
  Mar 25 at 2:41
  
  

  
  
  
  

add a comment | 

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0

I suggest to have a check in this link Swift: How to access in AppDelegate variable from the View controller?
else try in view controller,

class ViewController: UIViewController 

 var strName = "someString" // some value

In AppDelegate,

 var mainViewController = ViewController()

func applicationWillEnterForeground(_ application: UIApplication) 
 _ = self.window?.rootViewController as? ViewController
 print(mainViewController.strName)

share|improve this answer

edited Mar 25 at 6:02

answered Mar 22 at 4:52

AzeTechAzeTech

10929

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This has a error message at "let viewController = self.window?.rootViewController as? ViewController"
  
  – Edem
  Mar 25 at 2:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Edem, just try now the edited (or)section
  
  – AzeTech
  Mar 25 at 5:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Edem, check the edited answer now, check whether u have navigation controller in view controller.... I have tried its working and I can print the value in appdelegate (or else try this is did finish launch section in app delegate )
  
  – AzeTech
  Mar 25 at 6:10
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, no error message, but still get empty value....
  
  – Edem
  Mar 25 at 6:56
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Oh Yeh.......... I know, thank you a lot.
  
  – Edem
  Mar 25 at 9:17
  

  
  
  
  

 | 
show 4 more comments

0

I suggest to have a check in this link Swift: How to access in AppDelegate variable from the View controller?
else try in view controller,

class ViewController: UIViewController 

 var strName = "someString" // some value

In AppDelegate,

 var mainViewController = ViewController()

func applicationWillEnterForeground(_ application: UIApplication) 
 _ = self.window?.rootViewController as? ViewController
 print(mainViewController.strName)

share|improve this answer

edited Mar 25 at 6:02

answered Mar 22 at 4:52

AzeTechAzeTech

10929

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This has a error message at "let viewController = self.window?.rootViewController as? ViewController"
  
  – Edem
  Mar 25 at 2:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Edem, just try now the edited (or)section
  
  – AzeTech
  Mar 25 at 5:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Edem, check the edited answer now, check whether u have navigation controller in view controller.... I have tried its working and I can print the value in appdelegate (or else try this is did finish launch section in app delegate )
  
  – AzeTech
  Mar 25 at 6:10
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, no error message, but still get empty value....
  
  – Edem
  Mar 25 at 6:56
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Oh Yeh.......... I know, thank you a lot.
  
  – Edem
  Mar 25 at 9:17
  

  
  
  
  

 | 
show 4 more comments

I suggest to have a check in this link Swift: How to access in AppDelegate variable from the View controller?
else try in view controller,

class ViewController: UIViewController 

 var strName = "someString" // some value

In AppDelegate,

 var mainViewController = ViewController()

func applicationWillEnterForeground(_ application: UIApplication) 
 _ = self.window?.rootViewController as? ViewController
 print(mainViewController.strName)

share|improve this answer

edited Mar 25 at 6:02

answered Mar 22 at 4:52

AzeTechAzeTech

10929

class ViewController: UIViewController 

 var strName = "someString" // some value

 var mainViewController = ViewController()

func applicationWillEnterForeground(_ application: UIApplication) 
 _ = self.window?.rootViewController as? ViewController
 print(mainViewController.strName)

share|improve this answer

edited Mar 25 at 6:02

answered Mar 22 at 4:52

AzeTechAzeTech

10929

answered Mar 22 at 4:52

AzeTechAzeTech

10929

answered Mar 22 at 4:52

AzeTechAzeTech

10929

0

First you need to set the storyboard identifier in interface builder

Than you have to your initiate your viewcontroller object using following code.

 let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
 let viewcontroller = storyboard.instantiateViewController(withIdentifier: "ViewController") as? ViewController

Here you can change storyboard name according to your storyboard name.
After you got the controller object you can use easily find your viewcontroller variable.

share|improve this answer

answered Mar 22 at 4:55

jogshardikjogshardik

8531920

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why bring storyboards into it? You're adding complexity where it's not needed.
  
  – Caleb
  Mar 22 at 6:11
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This has an error at "class AppDelegate: UIResponder, UIApplicationDelegate,UNUserNotificationCenterDelegate {", it's shows " Thread 1: signal SIGABRT".
  
  – Edem
  Mar 25 at 2:41
  
  

  
  
  
  

add a comment | 

0

First you need to set the storyboard identifier in interface builder

Than you have to your initiate your viewcontroller object using following code.

 let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
 let viewcontroller = storyboard.instantiateViewController(withIdentifier: "ViewController") as? ViewController

Here you can change storyboard name according to your storyboard name.
After you got the controller object you can use easily find your viewcontroller variable.

share|improve this answer

answered Mar 22 at 4:55

jogshardikjogshardik

8531920

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why bring storyboards into it? You're adding complexity where it's not needed.
  
  – Caleb
  Mar 22 at 6:11
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This has an error at "class AppDelegate: UIResponder, UIApplicationDelegate,UNUserNotificationCenterDelegate {", it's shows " Thread 1: signal SIGABRT".
  
  – Edem
  Mar 25 at 2:41
  
  

  
  
  
  

add a comment | 

First you need to set the storyboard identifier in interface builder

Than you have to your initiate your viewcontroller object using following code.

 let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
 let viewcontroller = storyboard.instantiateViewController(withIdentifier: "ViewController") as? ViewController

Here you can change storyboard name according to your storyboard name.
After you got the controller object you can use easily find your viewcontroller variable.

share|improve this answer

answered Mar 22 at 4:55

jogshardikjogshardik

8531920

 let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
 let viewcontroller = storyboard.instantiateViewController(withIdentifier: "ViewController") as? ViewController

share|improve this answer

answered Mar 22 at 4:55

jogshardikjogshardik

8531920

answered Mar 22 at 4:55

jogshardikjogshardik

8531920

answered Mar 22 at 4:55

jogshardikjogshardik

8531920