CODEWITHSUNDEEP
ioskeyboarduitextfieldnsnotification
Vadoff
Vadoff

Reputation: 9419

How do I detect if keyboard is currently shown, if I transitioned from another view controller that was already showing the keyboard?

I have a view controller that makes a UITextField firstResponder on ViewWillAppear. Normally I could just rely on a UIKeyboardWillShow notification to detect if the keyboard has shown, but this won't trigger if I came into the current view controller while the keyboard was already showing.

Anyone have any ideas?

Upvotes: 4

Views: 10184

Answers (2)

Najdan Tomić
Najdan Tomić

Reputation: 2111

I noticed while debugging view hierarchy that when keyboard is presented there's UIRemoteKeyboardWindow in hierarchy.

First we can add extension to UIApplication to check window hierarchy for UIRemoteKeyboardWindow:

extension UIApplication {
    var isKeyboardPresented: Bool {
        if let keyboardWindowClass = NSClassFromString("UIRemoteKeyboardWindow"), self.windows.contains(where: { $0.isKind(of: keyboardWindowClass) }) {
            return true
        } else {
            return false
        }
    }
}

Then in viewDidLoad, or where needed we can check:

if UIApplication.shared.isKeyboardPresented {
   print("Keyboard is presented")
}

Although this method is not fully tested and UIRemoteKeyboardWindow is in private headers that's why NSClassFromString is needed for check. Use it with concern!

Upvotes: 9

Vineet Choudhary
Vineet Choudhary

Reputation: 7633

When you enter in a textField, it becomes first responder and then the keyboard will appears on your view. You can check the status of the keyboard in your viewWillAppear method [textField isFirstResponder]. If it returns YES, means your keyboard is visible.

-(void)viewWillAppear:(BOOL)animated{
     [super viewWillAppear:animated];
     if([textField isFirstResponder]){
       //visible keyboard
     }
}

Edited If you want the height than you can store the keyboard height in some class variable when it appears first time and use in viewWillAppear method

@implementation YourClass{
    CGFloat keyboardSize;
}

-(void)viewWillAppear:(BOOL)animated{
     [super viewWillAppear:animated];
     if([textField isFirstResponder]){
        //user keyboardSize here
     }
}

Upvotes: 4

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