Which code snippet correctly prepares data before transitioning to a new view controller using a segue in Swift?

easy📝 Conceptual Q2 of 15

iOS Swift - Navigation

Aoverride func viewDidLoad() { let dest = NextViewController() dest.data = "Hello" }

Boverride func prepare(for segue: UIStoryboardSegue, sender: Any?) { if segue.identifier == "nextScreen" { let dest = segue.destination as? NextViewController dest?.data = "Hello" } }

Coverride func prepare(for segue: UIStoryboardSegue, sender: Any?) { let dest = NextViewController() dest.data = "Hello" }

Doverride func prepare(for segue: UIStoryboardSegue, sender: Any?) { segue.destination.data = "Hello" }

Step-by-Step Solution

Solution:

Step 1: Identify correct method
Data should be set inside prepare(for:sender:) before segue.
Step 2: Proper casting
Cast segue.destination to the correct VC type using optional binding.
Step 3: Assign data
Assign the data property safely to avoid crashes.
Final Answer:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if segue.identifier == "nextScreen" { let dest = segue.destination as? NextViewController dest?.data = "Hello" } } correctly uses prepare(for:sender:), checks identifier, casts, and assigns data.
Quick Check:
prepare + cast + assign = correct [OK]

Quick Trick: Use prepare(for:sender:) with safe casting [OK]

Common Mistakes:

Creating a new instance instead of using segue.destination
Not checking segue identifier
Forgetting to cast destination VC

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More iOS Swift Quizzes

Which code snippet correctly prepares data before transitioning to a new view controller using a segue in Swift?

Step 1: Identify correct method

Step 2: Proper casting

Step 3: Assign data

Final Answer:

Quick Check:

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