[Solved] Consider the following Swift code snippet: let url = URL(string: "https://example.com/image.jpg")! URLSession.shared.dataTask(with:... | iOS Swift

iOS Swift - Networking

Consider the following Swift code snippet:

let url = URL(string: "https://example.com/image.jpg")!
URLSession.shared.dataTask(with: url) { data, response, error in
  if let data = data, let image = UIImage(data: data) {
    print("Image loaded successfully")
  } else {
    print("Failed to load image")
  }
}.resume()

What will be printed if the image data is corrupted and cannot be converted to a UIImage?

AThe app will crash

B"Image loaded successfully"

CNothing will be printed

D"Failed to load image"

Step-by-Step Solution

Solution:

Step 1: Analyze the data and image conversion
If data is non-nil but corrupted, UIImage(data: data) returns nil.
Step 2: Check the if-let condition
The condition if let data = data, let image = UIImage(data: data) fails because image is nil.
Step 3: Execute the else block
Therefore, the else block executes, printing "Failed to load image".
Final Answer:
"Failed to load image" -> Option D
Quick Check:
Remember that UIImage(data:) returns nil for invalid data [OK]

Quick Trick: UIImage(data:) returns nil if data is invalid [OK]

Common Mistakes:

Assuming image is always created if data exists
Not handling the else case for failed image creation
Expecting a crash instead of safe nil handling

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More iOS Swift Quizzes

Consider the following Swift code snippet:

Step 1: Analyze the data and image conversion

Step 2: Check the if-let condition

Step 3: Execute the else block

Final Answer:

Quick Check:

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