iOS Swift - Navigation
Why is it important to check if
navigationController is nil before pushing a view controller programmatically?Why is it important to check if navigationController is nil before pushing a view controller programmatically?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand navigationController optionality
Not all view controllers are embedded in a navigation controller, so it can be nil.Step 2: Consequence of nil navigationController
Calling pushViewController on nil causes a crash; checking prevents this.Final Answer:
Because pushing without a navigation controller causes a crash -> Option BQuick Check:
Check navigationController nil to avoid crash [OK]
Quick Trick: Always check navigationController is not nil before pushing [OK]
Common Mistakes:
- Assuming navigationController is never nil
- Confusing navigationController with tab bar controller
- Thinking pushViewController works without navigation controller
Master "Navigation" in iOS Swift
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