[Solved] Identify the error in the following Swift code for loading an image from a URL: let url = URL(string: "https://example.com/image.png") URLSession.shared.dataTask(with: url!... | iOS Swift

iOS Swift - Networking

Identify the error in the following Swift code for loading an image from a URL:

let url = URL(string: "https://example.com/image.png")
URLSession.shared.dataTask(with: url!) { data, response, error in
  let image = UIImage(data: data!)
  imageView.image = image
}.resume()

AURL is not unwrapped safely

BUIImage cannot be created from data

CMissing call to resume()

DUpdating UI on background thread

Step-by-Step Solution

Solution:

Step 1: Check thread usage for UI update
UI updates must happen on the main thread, but here imageView.image is set inside the background thread closure.
Step 2: Confirm other parts
URL is force unwrapped (not safe but not the main error here), resume() is called, and UIImage creation is valid if data exists.
Final Answer:
Updating UI on background thread -> Option D
Quick Check:
UI updates must be on main thread [OK]

Quick Trick: Always update UI on main thread after data task [OK]

Common Mistakes:

Forgetting DispatchQueue.main.async for UI
Force unwrapping optionals unsafely
Not calling resume() on data task

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More iOS Swift Quizzes

Identify the error in the following Swift code for loading an image from a URL:

Step 1: Check thread usage for UI update

Step 2: Confirm other parts

Final Answer:

Quick Check:

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