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Expression of type 'UIViewController?' is unused warning when pop view controller in swift 3.0 Code Example
Expression of type 'UIViewController?' is unused warning when pop view controller in swift 3.0 
@IBAction func goBackToIntroView(_ sender: UIButton) {
     
        self.navigationController?.popViewController(animated: true)
    }
//  popViewController(animated:) returnsUIViewController?
// , and the compiler is giving that warning since you aren't capturing the value. The solution is to assign it to an underscore:
// Answer

_ = navigationController?.popViewController(animated: true)
Source: developer.apple.com



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Category:
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Sub Category:
 Code Example
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