/Swift/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

@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

Similar codes

1 vote183 views1 answer
Declaring optionals swift
Swift
0 vote172 views2 answers
Swift copy video from photo library
Swift
0 vote104 views1 answer
Placeholder color swift
Swift
0 vote159 views1 answer
How to dismiss a view when touch up inside swift
Swift
0 vote162 views1 answer
Ios network request
Swift
0 vote210 views1 answer
How to Not bool bindng swiftui
Swift
0 vote168 views1 answer
Wkwebview load delegate in swift
Swift
0 vote161 views1 answer
Uilabel make bold
Swift
0 vote170 views1 answer
How to add two right bar button item xcode
Swift
0 vote199 views1 answer
How to make box shadow swift
Swift