Unbalanced calls to begin/end appearance transitions for...

Question

Xcoder72908 OP

Created Mar ’21

Replies 12

Boosts 0

Views 5.8k

Participants 2

There is a problem in my navigation controller after the google sign in here,

Code Block Swift UserDefaults.standard.set(downloadUrl, forKey: "profile_picture_url")
                          let vc = self?.storyboard?.instantiateViewController(identifier: "tabBarVC") as! TabBarViewController
                          vc.modalPresentationStyle = .fullScreen
                          self?.present(vc, animated: true)

Here is my code attached

Here is the code

Boost

Answer 1

Claude31 OP

Mar ’21

Could you explain precisely what the problem is ?
Do you get an error message ? Where exactly ?

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Answer 2

Xcoder72908 OP

Mar ’21

I get an error that says unbalanced calls to begin/end appearance transitions, when I am transitioning from the google sign in to the main view controller in this line of code,

Code Block Swift UserDefaults.standard.set(downloadUrl, forKey: "profile_picture_url")                          let vc = self?.storyboard?.instantiateViewController(identifier: "tabBarVC") as! TabBarViewController                          vc.modalPresentationStyle = .fullScreen                          self?.present(vc, animated: true)

0

Answer 3

Claude31 OP

Mar ’21

In

Code Block UserDefaults.standard.set(downloadUrl, forKey: "profile_picture_url")                         
let vc = self?.storyboard?.instantiateViewController(identifier: "tabBarVC") as! TabBarViewController                          vc.modalPresentationStyle = .fullScreen                         
self?.present(vc, animated: true)

Note: why optional chaining self? and not just self.
Did you try to present in the main thread ?

Code Block let vc = self.storyboard?.instantiateViewController(identifier: "tabBarVC") as! TabBarViewController
vc.modalPresentationStyle = .fullScreen
DispatchQueue.main.async {
    self.present(vc, animated: true)
}

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Answer 4

Xcoder72908 OP

Mar ’21

No, its because I used weak self

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Answer 5

Claude31 OP

Mar ’21

And did you try the solution ?

Code Block let vc = self?.storyboard?.instantiateViewController(identifier: "tabBarVC") as! TabBarViewController
vc.modalPresentationStyle = .fullScreen
DispatchQueue.main.async {
    self?.present(vc, animated: true)
}

If that works, don't forget to close the thread. If not, please tell exactly what you get as error.

0

Answer 6

Xcoder72908 OP

Mar ’21

it doesn't work instead it says Unbalanced calls to begin/end appearance transitions for <(my project name).MainViewController: 0x7fc541815800>, (main view controller is my navigation controller)

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Answer 7

Xcoder72908 OP

Mar ’21

Anyone have any solutions?

0

Answer 8

Claude31 OP

Mar ’21

Don't animate present.
Replace

Code Block self?.present(vc, animated: true)

with

Code Block self?.present(vc, animated: false)

Also check you call super where needed, as you did in viewDidLoad.

0

Answer 9

Xcoder72908 OP

Mar ’21

Thanks, but this didn't help because I realized there is a problem with
my google sign in so it's not even reaching the line with this code...

Code Block Swiftself?.present(vc, animated: true)

0

Answer 10

Claude31 OP

Mar ’21

So that means the problem is not in the code you posted in your first post ?

Code Block  UserDefaults.standard.set(downloadUrl, forKey: "profile_picture_url")
                          let vc = self?.storyboard?.instantiateViewController(identifier: "tabBarVC") as! TabBarViewController
                          vc.modalPresentationStyle = .fullScreen
                          self?.present(vc, animated: true)

0

Answer 11

Xcoder72908 OP

Mar ’21

If you click on the here is the code section of my question there is a google sign in function, and that's where the error is coming from.

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Answer 12

Xcoder72908 OP

Mar ’21

what?

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