/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

0 vote218 views1 answer
How to get dictonary key and value swift
Swift
0 vote231 views2 answers
Swift 5 full screen image viewer
Swift
4 votes243 views1 answer
Swift language compiler
Swift
1 vote238 views1 answer
Get appdelegate instance swift
Swift
5 votes252 views1 answer
Round up swift
Swift
0 vote289 views1 answer
Left side of mutating operator isn't mutable: 'self' is immutable
Swift
0 vote243 views1 answer
Swift create array from range
Swift
1 vote245 views2 answers
Swift quit app
Swift
0 vote240 views1 answer
Xcode enable a button after a text field is filled
Swift
0 vote289 views1 answer
Regular expression for number less than 100
Swift