cupertino picker returns index value instead of String

[Error Place]

hey guys. 

does anyone know what i am setting wrong here? 

my cuppertinoPicker shows the Texts as children but when i return the value it gets me the index of chosen item?

int selectedValue;

CupertinoPicker(
  onSelectedItemChanged: (value) {
    setState(() {
      selectedValue = selectedValue;

    });
  }

Text('New york'),
Text('london'),
Text('stockholm'),

[Error Place]

Solved , 

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