NEW: Check out my podcast with Sean Allen, Swift over Coffee! >>

How to detect when the Back button is tapped

Paul Hudson       @twostraws

You probably already know that viewWillDisappear() is called when a view controller is about to go away, and that's also called when the user taps the Back button in a navigation controller. Problem is, the same method is called when the user moves forward, i.e. when you push another view controller onto the stack.

The solution is simple: create a Boolean property called goingForwards in your view controller, and set it to true before pushing any view controller onto the navigation stack, then set it back to false when the view controller is shown again. This way, when viewWillDisappear() is called you can check goingForwards: if it's false, the user tapped Back.

Available from iOS 2.0

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

Become a Swift expert

I wrote a book called Pro Swift that's dedicated to helping you master the Swift language, and it includes seven hours of video demonstrating each technique!

MASTER SWIFT NOW
Buy Testing Swift Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Average rating: 5.0/5

Click here to visit the Hacking with Swift store >>