iOS Swift - Navigation
Which Swift code snippet correctly casts the destination view controller in prepare(for:sender:) to pass data?
Which Swift code snippet correctly casts the destination view controller in prepare(for:sender:) to pass data?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Understand safe casting in Swift
Using 'as?' safely casts the destination to the expected type, avoiding crashes.Step 2: Identify correct syntax
if let destVC = segue.destination as? DetailViewController { destVC.data = value } uses 'if let' with 'as?' which is the recommended pattern for optional casting.Final Answer:
if let destVC = segue.destination as? DetailViewController { destVC.data = value } -> Option DQuick Check:
Safe casting with 'as?' and 'if let' [OK]
Quick Trick: Use 'if let' with 'as?' for safe casting [OK]
Common Mistakes:
- Using forced cast 'as!' without safety
- Trying to cast to wrong type like String
- Assigning data without casting
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