iOS Segue not working as expected when passing value

Question

I have a button with the following code:

@IBAction func buttonPress(sender: AnyObject) {
    performSegueWithIdentifier("newAccount", sender: sender)
}

When the button is pressed it performs a segue. I want to pass a value to the new view controller so I added the following code:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "newAccount" {
        if let dvc = segue.destinationViewController as? NewAccountViewController {
            dvc.testValue = "This is my test value I want to pass"
        }
    }
}

The NewAccountViewController doesn't receive the value (I don't get any error).

The code I have in my NewAccountViewController is:

var testValue:String?

When I print(testValue) I don't get anything.

Why isn't this working as expected?

Have you checked that you set the class of destinationViewController to `NewAccountViewController` in storyboard ? — Leo, Mar 02 '16 at 05:32
Have you put a breakpoint on `dvc.testValue` to see if it's being executed? Maybe the `if let` fails, or the case of `segue.identifier` is different. You shouldn't need to test the identifier on the assumption the `if let` will only work for the right VC. — Michael, Mar 02 '16 at 05:39
@Michael It looks like the if let part fails. I added print("test if let") to the if let statement and it does not print. — user1822824, Mar 02 '16 at 05:41
So as @Leo points out, you probably haven't set the class of the VC. — Michael, Mar 02 '16 at 05:42
your `if segue.identifier == "newAccount"` is satisfied , if yes `if let dvc = segue.destinationViewController as? NewAccountViewController` condition is statisfied or not — Anbu.Karthik, Mar 02 '16 at 05:46

score 3 · Accepted Answer · answered Mar 02 '16 at 05:44

3

You need to check if the class is set correctly

Like the ViewController in below image

answered Mar 02 '16 at 05:44

Leo

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score 0 · Answer 2 · answered Mar 02 '16 at 05:46

There are maybe two reasons: 1. identifier is not set as "newAccount" in the storyboard; 2. you have put a navigator view controller into the NewAccountViewController, which would ask you to transfer the destination as UINavigationController instead of NewAccountViewController. Hope this helps.

iOS Segue not working as expected when passing value

2 Answers2