[Solved] What is wrong with this Swift code for saving and retrieving a color string? UserDefaults.standard.... What is wrong with this Swift code for saving and retrieving a color string? | iOS Swift

iOS Swift - Local Data Persistence

What is wrong with this Swift code for saving and retrieving a color string?

UserDefaults.standard.setValue("blue", forKey: "color")
let color = UserDefaults.standard.string(forKey: "color")
print(color!)

AUsing setValue instead of set may cause unexpected behavior

BThe key "color" should be an integer

CForce unwrapping color with '!' can cause a crash if nil

DUserDefaults cannot store strings

Step-by-Step Solution

Solution:

Step 1: Analyze setValue usage
setValue works but set is preferred; not an error here.
Step 2: Check key type
Keys must be strings, so "color" is correct.
Step 3: Identify force unwrap risk
Using 'color!' can crash if the value is nil.
Final Answer:
Force unwrapping color with '!' can cause a crash if nil -> Option C
Quick Check:
Avoid force unwrapping optional values [OK]

Quick Trick: Never force unwrap optionals without checking [OK]

Common Mistakes:

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What is wrong with this Swift code for saving and retrieving a color string?