[Solved] Given the code snippet below, what will be the value of destinationVC.userName after the segue?override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if segue.... | iOS Swift

iOS Swift - Navigation

Given the code snippet below, what will be the value of destinationVC.userName after the segue?

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
  if segue.identifier == "showDetail" {
    let destinationVC = segue.destination as! DetailViewController
    destinationVC.userName = "Alice"
  }
}

A"Alice"

Bnil

CAn empty string ""

DCauses a runtime crash

Step-by-Step Solution

Solution:

Step 1: Check the segue identifier and casting
The code checks if the segue identifier is "showDetail" and casts the destination to DetailViewController safely using forced cast.
Step 2: Assign the userName property
It sets destinationVC.userName to "Alice" before the segue completes.
Final Answer:
"Alice" -> Option A
Quick Check:
prepare sets userName = "Alice" [OK]

Quick Trick: Check identifier and cast before assigning data [OK]

Common Mistakes:

Forgetting to check segue.identifier
Not casting destinationVC correctly
Assuming userName remains nil

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More iOS Swift Quizzes

Given the code snippet below, what will be the value of destinationVC.userName after the segue?

Step 1: Check the segue identifier and casting

Step 2: Assign the userName property

Final Answer:

Quick Check:

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