How to extract values from Eureka forms in swift to local variables?

Question

While I try to pass it to temporary variables it doesn't seem to happen.

Although there are no errors while building the app, once I try to enter a value for "rateOfPaddy", it fails, citing "fatal error: unexpectedly found nil while unwrapping an Optional value"

Please let me know if I'm doing anything wrong, either related to Swift or Eureka?

    form +++ Section()
                <<< DateTimeRow() {
                    $0.tag = "RecordDateTag"
                    $0.title = "Date"
                    $0.value = NSDate()
                    }.cellSetup { cell, row in
                        cell.textLabel?.textColor = UIColor.blackColor()
                    }.onCellHighlight { _ in
                        if let dateInput = formInput["RecordDateTag"] as? String {
                            self.dateInputValue = dateInput
                        }
                    }.onCellUnHighlight { _ in
                        if let dateInput = formInput["RecordDateTag"] as? String {
                            self.dateInputValue = dateInput
                        }
                }

I used .onChange callback to check and pass the information to local variables, which was of no use. .onCellHighlight and .onCellUnHighlight combination didn't do the trick either!!

Answer 1

Try calling values function as documented here

You can create a method like below and call it from onChange callbacks

func updateValues() {
    let allFormData = formInput.values()

    if let dateInput = allFormData["RecordDateTag"] as? String {
        self.dateInputValue = dateInput
    }
}

Answer 2

The error "fatal error: unexpectedly found nil while unwrapping an Optional value" means that you are trying to unwrap an optional that has nil as a value.

Verify that every formInput[KEY] has a value of the type you expect before forcing the unwrap with the as!

You could benefit from the Optional Binding

if let value = formInput["Some"] as? Int
{
    //Value exist and is an Int
}
else
{
    print("Not an Int")
}

For More references:

Swift Type Casting

Swift Optionals