Expression of type 'UIViewController?' is unused warning when pop view controller in swift 3.0

ACS answered on August 16, 2020 Popularity 2/10 Helpfulness 1/10

answer Expression of type 'UIViewController?' is unused warning when pop view controller in swift 3.0

Expression of type 'UIViewController?' is unused warning when pop view controller in swift 3.0

Comment

@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)

Popularity 2/10 Helpfulness 1/10 Language swift

Source: developer.apple.com

Tags: controller expression swift view when

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