CODEWITHSUNDEEP
iosswiftoption-type
j-s
j-s

Reputation: 157

Value of optional type 'Float?' not unwrapped; did you mean to use '!' or '?'?

I define a class in Swift like the following:

var moduleName : String?
var moduleWeight : Float = 0
var moduleMark : Double = 0.0
var moduleCompletion : Int = 0
var moduleNotes : String?

I have another function that accesses these variables

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    //

    if segue.identifier == "courseWorkTopView"
    {
        if let topViewController = segue.destination as? assignmentTopViewController{
            topViewController.moduleName = detailItem?.moduleName
            topViewController.moduleWeight = detailItem?.value
        }
    }
}

I get the error:

Value of optional type 'Float?' not unwrapped; did you mean to use '!' or '?'?

I tried the following code as well

topViewController.moduleWeight = (detailItem?.value)!

But I get a run time error:

Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)

I'm new to swift and it will be great if someone could help to fix this issue

Upvotes: 0

Views: 741

Answers (2)

Gereon
Gereon

Reputation: 17864

detailItem is nil. If you want to avoid the crash, you can use

topViewController.moduleWeight = detailItem?.value ?? 0

(or use any other reasonable default), or do

 if let topViewController = segue.destination as? assignmentTopViewController, let detail = detailItem {
    topViewController.moduleName = detail.moduleName
    topViewController.moduleWeight = detail.value
 }

Upvotes: 1

Abdelahad Darwish
Abdelahad Darwish

Reputation: 6067

you can solve like that

topViewController.moduleWeight = detailItem?.value ?? 0

or change moduleWeight as optional

var moduleWeight : Float?

and use it normal

topViewController.moduleWeight = detailItem?.value

Upvotes: 1

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