Navigate between the tab bar with swipe gestures

Question

Navigate between the tab bar with swipe gestures

I want to navigate between my tab bar using gestures. What's the easiest way to do this? I've tried something like this ...

import UIKit

class postAdViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        var leftSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))
        view.addGestureRecognizer(leftSwipe)    
    }

    func handleSwipes(sender:UISwipeGestureRecognizer) {
        if (sender.direction == .left) {
            let storyboard = UIStoryboard(name: "Main", bundle: nil)
            let vc = storyboard.instantiateViewController(withIdentifier: "favourireviewcontroller") as! UIViewController
            self.present(vc, animated: true, completion: nil)
        }
        if (sender.direction == .right) {

        }
}

If I try to slip, nothing happens. Application crashes while scrolling leaves an error message

unrecognized selector posted to instance 0x7f924380a730

+5

ios swift swift3 xcode8 swipe

Md Oliuzzaman May 28 '17 at 20:35

source to share

5 answers

Rashwan L · Answer 1 · 2017-05-28T22:23:31+0000

Well, if you want to navigate through you tabBar

, you have to implement swipeGestureRecognizer

for .left

and .right

, and then work with tabBarController?.selectedIndex

, something like this:

let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(swiped))
swipeRight.direction = UISwipeGestureRecognizerDirection.right
self.view.addGestureRecognizer(swipeRight)

let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(swiped))
swipeLeft.direction = UISwipeGestureRecognizerDirection.left
self.view.addGestureRecognizer(swipeLeft)

func swiped(_ gesture: UISwipeGestureRecognizer) {
    if gesture.direction == .left {
        if (self.tabBarController?.selectedIndex)! < 2 { // set your total tabs here
            self.tabBarController?.selectedIndex += 1
        }
    } else if gesture.direction == .right {
        if (self.tabBarController?.selectedIndex)! > 0 {
            self.tabBarController?.selectedIndex -= 1
        }
    }
}

Byron salty · Answer 2 · 2018-06-16T21:32:20+0000

Here is a Swift4 example of swiping left and right through a TabBar controller.

What I don't like about this solution: - it seems like you should be able to register the handler once and discern the direction within the handler itself, but I couldn't easily do that. - I'm also curious about how to make a gesture that involves dragging for visual effect. I think I need to enable PanGesture to make this happen.

override func viewDidLoad() {
    super.viewDidLoad()

    let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes(_:)))
    let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes(_:)))
    leftSwipe.direction = .left
    rightSwipe.direction = .right
    self.view.addGestureRecognizer(leftSwipe)
    self.view.addGestureRecognizer(rightSwipe)

}

And then the handler:

@objc func handleSwipes(_ sender:UISwipeGestureRecognizer) {
    if sender.direction == .left {
        self.tabBarController!.selectedIndex += 1
    }
    if sender.direction == .right {
        self.tabBarController!.selectedIndex -= 1
    }
}

praful argiddi · Answer 3 · 2018-07-02T11:38:23+0000

try using Swift 4 selector syntax:

//below code write in view did appear()
let swipeRight = UISwipeGestureRecognizer(target: self, action:  #selector(swiped))
    swipeRight.direction = UISwipeGestureRecognizerDirection.right
    self.view.addGestureRecognizer(swipeRight)

    let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(swiped))
    swipeLeft.direction = UISwipeGestureRecognizerDirection.left
    self.view.addGestureRecognizer(swipeLeft)
  // below code create swipe gestures function

  // MARK: - swiped
   @objc  func swiped(_ gesture: UISwipeGestureRecognizer) {
    if gesture.direction == .left {
        if (self.tabBarController?.selectedIndex)! < 2
        { // set here  your total tabs
            self.tabBarController?.selectedIndex += 1
        }
    } else if gesture.direction == .right {
        if (self.tabBarController?.selectedIndex)! > 0 {
            self.tabBarController?.selectedIndex -= 1
        }
    }
}

productioncoder · Answer 4 · 2017-05-28T20:43:35+0000

Try using the syntax Swift 3

:

let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes(_:))

So

override func viewDidLoad() {
    super.viewDidLoad()

    nextButton.layer.cornerRadius = 7

    let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes(_:))
    //leftSwipe.direction = .right
    view.addGestureRecognizer(leftSwipe)
}



func handleSwipes(_ sender: UISwipeGestureRecognizer) {
    if (sender.direction == .left) {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let vc = storyboard.instantiateViewController(withIdentifier: "favourireviewcontroller") as! UIViewController
        self.present(vc, animated: true, completion: nil)
    }

    if (sender.direction == .right) {

    }
}

Swift 3

introduced this function to allow the compiler to check if an existing one exists function

. Therefore, it is much better than the concepts previously.

Evan stone · Answer 5 · 2019-05-05T15:23:04+0000

Here's a slightly modified version of an earlier proposal that's ready for Swift 5 and iOS 12.

Real benefits:

it uses guard

operators so you don't have to mess with tabBarController

and viewControllers

in the handler
it doesn't require a hardcoded number of tabs - it just gets it from an array viewControllers

.

I've also cleaned it up a bit to make it a little less verbose. It has been tested with Swift 5 running on iOS 12 (and that should be fine on iOS 11.4 as this was my minimal deployment version I tested this on).

Add them to viewDidLoad

(or some other suitable location of your choice):

let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipeGesture))
swipeRight.direction = .right
self.view.addGestureRecognizer(swipeRight)

let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipeGesture))
swipeLeft.direction = .left
self.view.addGestureRecognizer(swipeLeft)

Then add this as your event handler:

@objc func handleSwipeGesture(_ gesture: UISwipeGestureRecognizer) {
  guard let tabBarController = tabBarController, let viewControllers = tabBarController.viewControllers else { return }
  let tabs = viewControllers.count        
  if gesture.direction == .left {
      if (tabBarController.selectedIndex) < tabs {
          tabBarController.selectedIndex += 1
      }
  } else if gesture.direction == .right {
      if (tabBarController.selectedIndex) > 0 {
          tabBarController.selectedIndex -= 1
      }
  }
}

Navigate between the tab bar with swipe gestures

More articles: