SMDev SMDev - 1 year ago 118
Swift Question

iOS prepareforsegue throwing xc_bad

I'm using a


override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
if segue.identifier == "roundSegue" {

var selectedRound:NSManagedObject = roundList[self.tableView.indexPathForSelectedRow().row] as NSManagedObject

let SVC: SetupVC = segue.destinationViewController as SetupVC

SVC.course = selectedRound.valueForKey("course") as String
SVC.existingRound = selectedRound


However, it is throwing an error "Thread 1:EXC_BAD_INSTRUCTION", on the 'if segue.identifier == "roundSegue"' line...any thoughts on why it would be throwing this error?

Answer Source

It is possible that your segue identifier is nil. If this is the case, you are attempting to unwrap a implicitly unwrapped optional variable that is nil, which would cause a crash. try this instead:

if let identifier = segue.identifier {
    if identifier == "roundSegue" {
        // your code here.
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