value is not nil but getting unexpectedly found nil while unwrapping an Optional value

Question

I am trying to send some data from an array to an other interfaceController. The problem is that I am getting

unexpectedly found nil while unwrapping an Optional value exception

even though the array is not nil. In fact I can even print the result using

print(...).

the problem is that I cannt set this result to a label without getting the exception.

Here is my code to laugh the new interfaceController with context data

@IBAction func lauchInterfaceClick() {

    presentControllerWithName("SecondInterface", context: ["hi","how are you"])

}

And then retrieve the results in SecondInterface like below

override func awakeWithContext(context: AnyObject?) {
    super.awakeWithContext(context)

    // Configure interface objects here.
    if context != nil{

        let somevalue = context as! [String]

        // here is where I getting the exception, in addition to Thread 1: EXC_BAD_INSTRUCTION (code=EXC_i386_INVOP, subcode=0x0)
        self.showWat.setText(String(somevalue[0]))

        // I have also tried this
        // self.showWat.setText(somevalue[0])

    }

please note that on the other hand a print(String(somevalue[0])) outputs hi

there are a million questions here on SO about this error, are you sure none of them offer you a solution? — Hamish, Jan 19 '16 at 11:14
You're getting the error because `showWat` is nil, not the array. — Cihan Tek, Jan 19 '16 at 11:19
@CihanTek how is it possible? showWat is a WKInterfaceLabel.. How could I fix it then — hight, Jan 19 '16 at 17:28
@originaluser2 unfortunately I haven' t one where even though the value is there there is still an error.. all of them are more or less similar.. in their case the value passed is nil but in my case this value is not nil — hight, Jan 19 '16 at 17:31
sorry guys ..I found out that I disconnected the wkInterfaceLabel to the label in the interfaceController... — hight, Jan 19 '16 at 22:06

score 0 · Answer 1 · edited May 23 '17 at 10:27

0

I would use an implementation of awakeWithContext(context: AnyObject?) like this:

override func awakeWithContext(context: AnyObject?) {
    super.awakeWithContext(context)

    // Configure interface objects here.
    if context != nil{

        let somevalue = context as? [String] {
            if somevalue.count > 0 {
                let text = somevalue[0]
                showWat.setText(text)
            }


        } else {

            // Unwrapped optional is nil
            print("someValue is nil!")
        }

    }
}

Checkout the section 'Optional Chaining as an Alternative to Forced Unwrapping' in the Swift Programming Language Reference.

Or checkout this answer here on Stack overflow.

edited May 23 '17 at 10:27

Community

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answered Jan 19 '16 at 12:25

Peter Hornsby

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Ok, so what results did you get? Can you confirm which object is nil? I would guess that showWat is nil. – Peter Hornsby Jan 19 '16 at 17:46
I got the same exception. However when I assign the value directly like self.showWat.setText("hi"), it works perfectly – hight Jan 19 '16 at 18:10
if somevalue.count > 0 { let text = somevalue[0] showWat.setText(text) Then try: if showWat != nil { showWat.setText(text) } } – Peter Hornsby Jan 19 '16 at 18:14
You need to find what optional is nil. – Peter Hornsby Jan 19 '16 at 18:14
sorry guys ..I just found out that I disconnected the wkInterfaceLabel to the label in the interfaceController... I think that was the problem – hight Jan 19 '16 at 18:32

value is not nil but getting unexpectedly found nil while unwrapping an Optional value

1 Answers1