Bdtjtk

I'm developing app with Swift 4.2 and I have problems with iOS app crash.
For me everything works fine, but it doesn't work for others who installed app with testflight.
Error is like this.

Here's a code that adds handler.

cell.btnBooknow.addTarget(self, action: #selector(pressBookNowButton(button:)), for: .touchUpInside)

Here is a button click handler.

@objc func pressBookNowButton(button: UIButton) {

    guard let tagValue = self.arrListingBagHandler.object(at: button.tag) else {

        return

    }

    print(self.artworks)



    print(self.onlineStatus)

    print(self.arrSearchAddressResult)





    print(tagValue)

    let valueStatus = tagValue["IsOnline"] as! String

    let availability = tagValue["AvailabilityDays"] as! String

    let arr = Array(availableDays)

    print(valueStatus)

    print(arr)

    let arrAvailability = Array(availability)

    print(arrAvailability)

    let arr1 = availability.components(separatedBy: ",")

    print(arr1)



    let day = (presentDay!-1)

    let today = "(day)"

    print(today)

    if arr1.contains(today)

    {

        availableToday = true

    }

    else

    {

        availableToday = false

    }



    if valueStatus == "1" && availableToday == true

    {

        let obj = self.storyboard?.instantiateViewController(withIdentifier: "bookingId") as! BookingViewController

        obj.dicBagHanlderDetail = tagValue

        self.navigationController?.pushViewController(obj, animated: true)

    }

    else 

    {

        let alert = UIAlertController(title: "Alert!", message: "You can't make booking because store is currently closed.", preferredStyle: .alert)

        let okAction = UIAlertAction(title: "OK", style: .cancel) { (actoin) in

        }

        alert.addAction(okAction)

        self.present(alert, animated: true, completion: nil)

    }



}

Can anyone please help me?
Thanks.

Please use below function and resolve an issue. I think it is possible because of the force cast string and int value.

@objc func pressBookNowButton(button: UIButton) {

guard let tagValue = self.arrListingBagHandler.object(at: button.tag) else {

    return

}









let valueStatus = tagValue["IsOnline"] as? String ?? ""

let availability = tagValue["AvailabilityDays"] as? String ?? ""

let arr = Array(availableDays)



let arrAvailability = Array(availability)



let arr1 = availability.components(separatedBy: ",")



let value : Int = Int(presentDay) ?? 0

let day = (value-1)

let today = "(day)"



if arr1.contains(today)

{

    availableToday = true

}

else

{

    availableToday = false

}



if valueStatus == "1" && availableToday == true

{

    let obj = self.storyboard?.instantiateViewController(withIdentifier: "bookingId") as! BookingViewController

    obj.dicBagHanlderDetail = tagValue

    self.navigationController?.pushViewController(obj, animated: true)

}

else

{

    let alert = UIAlertController(title: "Alert!", message: "You can't make booking because store is currently closed.", preferredStyle: .alert)

    let okAction = UIAlertAction(title: "OK", style: .cancel) { (actoin) in

    }

    alert.addAction(okAction)

    self.present(alert, animated: true, completion: nil)

}



}

As others suggested any ! is a potential crash. Try to replace it with guard or default values. For example you can change:

let valueStatus = tagValue["IsOnline"] as! String

let availability = tagValue["AvailabilityDays"] as! String

To solution with default values:

let valueStatus = tagValue["IsOnline"] as? String ?? "1"

let availability = tagValue["AvailabilityDays"] as? String ?? "5"

Or even better guard and e.g. display alert if data aren't available:

guard let valueStatus = tagValue["IsOnline"] as? String,

    let availability = tagValue["AvailabilityDays"] as? String else {

    // Display alert in case of unavailable data (or simply return)

    let alert = UIAlertController(title: "Alert!", message: "You can't make booking because store is currently closed.", preferredStyle: .alert)

    let okAction = UIAlertAction(title: "OK", style: .cancel) { _ in }

    alert.addAction(okAction)

    self.present(alert, animated: true, completion: nil)

    return

}

// Continue as expected here...