iOS Swift - Networking
Identify the error in this Swift code for making an API call:
let url = URL(string: "https://api.example.com/data")
let task = URLSession.shared.dataTask(with: url!) { data, response, error in
print(data)
}
task.resume()
Identify the error in this Swift code for making an API call: let url = URL(string: "https://api.example.com/data") let task = URLSession.shared.dataTask(with: url!) { data, response, error in print(data) } task.resume()
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Check URL unwrapping safety
Force unwrapping url! is unsafe if URL(string:) returns nil.Step 2: Review other code parts
Calling task.cancel() is not required before resume; dataTask is not deprecated; ignoring response is allowed but not best practice.Final Answer:
Force unwrapping URL can cause a crash if URL is nil -> Option CQuick Check:
Unsafe force unwrap = crash risk [OK]
Quick Trick: Avoid force unwrapping URLs; use safe optional binding [OK]
Common Mistakes:
- Thinking task.cancel() is mandatory before resume()
- Believing dataTask is deprecated
- Ignoring response always causes errors
Master "Networking" in iOS Swift
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