Deep linking in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to handle a URL in the AppDelegate method.

iOS Swift

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
    return [1]
}

Drag options to blanks, or click blank then click option'

Atrue

Bfalse

Cnil

Durl.isFileURL

Attempts:

3 left

💡 Hint

Common Mistakes

Returning false causes the system to think the URL was not handled.

Returning nil is invalid because the method expects a Bool.

Returning true indicates the app successfully handled the URL.

2fill in blank

medium

Complete the code to extract the host from the incoming URL.

iOS Swift

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
    guard let host = url.[1] else { return false }
    print("Host: \(host)")
    return true
}

Drag options to blanks, or click blank then click option'

Apath

Bhost

Cscheme

Dquery

Attempts:

3 left

💡 Hint

Common Mistakes

Using url.path returns the path after the host, not the host itself.

Using url.scheme returns the protocol like 'https'.

The host property gives the domain or host part of the URL.

3fill in blank

hard

Fix the error in the code to correctly parse query parameters from the URL.

iOS Swift

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
    let components = URLComponents(url: url, resolvingAgainstBaseURL: false)
    if let queryItems = components?.[1] {
        for item in queryItems {
            print("\(item.name): \(item.value ?? "")")
        }
    }
    return true
}

Drag options to blanks, or click blank then click option'

Aparameters

BqueryParameters

CqueryItems

Dquery

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'query' or 'parameters' causes a compile error because those properties do not exist.

Forgetting to unwrap optional components.

URLComponents has a property named queryItems which is an array of URLQueryItem.

4fill in blank

hard

Fill both blanks to create a URL scheme check and handle it.

iOS Swift

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
    if url.[1] == "myapp" {
        // Handle the URL
        print("Custom scheme detected")
        return [2]
    }
    return false
}

Drag options to blanks, or click blank then click option'

Ascheme

Bhost

Ctrue

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Checking host instead of scheme for the URL type.

Returning false even after handling the URL.

The scheme property gives the URL scheme like 'myapp'. Returning true means the URL was handled.

5fill in blank

hard

Fill all three blanks to safely unwrap the URL, check the scheme, and extract the path.

iOS Swift

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
    guard url.[1] == "myapp" else { return false }
    let path = url.[2] ?? ""
    print("Path: \(path)")
    return [3]
}

Drag options to blanks, or click blank then click option'

Ascheme

Bpath

Ctrue

Dhost

Attempts:

3 left

💡 Hint

Common Mistakes

Not unwrapping the optional URL before use.

Checking host instead of scheme.

Returning false even after handling the URL.

First check the scheme, then get the path property, and return true to confirm handling.