CODEWITHSUNDEEP
swift3uiswipegesturerecognizer
Jimmy Wong
Jimmy Wong

Reputation: 1

Swift 3 - Swipe left to change label by using Array

I beginner learning Swift 3 - UISwipe gesture but cannot work if using Array.

This my code.

How can I code so the Label only change from "hello1" to "hello2" then swipe left again to "hello3". Also reverse swipe to right back from "hello3" to "hello2" and "hello1". or loop back to first one.

Thanks.

class ChangeLabelViewController: UIViewController {

var helloArray = ["Hello1", "Hello2", "Hello3"]
var currentArrayIndex = 0


@IBOutlet weak var helloLabel: UILabel!


override func viewDidLoad() {
    super.viewDidLoad()

    let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(ChangeLabelViewController.handleSwipes(sender:)))

    let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(ChangeLabelViewController.handleSwipes(sender:)))

    leftSwipe.direction = .left
    rightSwipe.direction = .right

    view.addGestureRecognizer(leftSwipe)
    view.addGestureRecognizer(rightSwipe)

    helloLabel.text = helloArray[currentArrayIndex]
}

func handleSwipes(sender: UISwipeGestureRecognizer) {

    if sender.direction == .left {
        helloLabel.text = helloArray[currentArrayIndex + 1]


    }

    if sender.direction == .right {

    }
}

Upvotes: 0

Views: 597

Answers (2)

Jigar Tarsariya
Jigar Tarsariya

Reputation: 3247

you can also do it with below code,

func handleSwipes(sender: UISwipeGestureRecognizer) {

    if sender.direction == .left {

        if(currentArrayIndex < helloArray.count - 1)
        {
            currentArrayIndex += 1
            let indexPath = IndexPath(item: currentArrayIndex, section: 0)
            helloLabel.text = helloArray[indexPath.row]
        }
    }

    if sender.direction == .right {

        if(currentArrayIndex > 0)
        {
            currentArrayIndex -= 1
            if currentArrayIndex == -1
            {
                currentArrayIndex = 0
                let indexPath = IndexPath(item: currentArrayIndex, section: 0)
                helloLabel.text = helloArray[indexPath.row]
            }
            else {
                let indexPath = IndexPath(item: currentArrayIndex, section: 0)
                helloLabel.text = helloArray[indexPath.row]
            }
        }

    }

Upvotes: 0

simalone
simalone

Reputation: 2768

Try this:

if sender.direction == .left {
    currentArrayIndex = (currentArrayIndex + 1) % 3
    helloLabel.text = helloArray[currentArrayIndex]
}

if sender.direction == .right {
    currentArrayIndex = (currentArrayIndex + 3 - 1) % 3 //if uInt
    helloLabel.text = helloArray[currentArrayIndex]
}

Upvotes: 1

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