Coordinator pattern in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a Coordinator protocol with a start method.

iOS Swift

protocol Coordinator {
    func [1]()
}

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Astart

Brun

Claunch

Dbegin

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names like begin or run instead of start.

Forgetting to declare the method in the protocol.

The Coordinator pattern requires a start() method to begin navigation flow.

2fill in blank

medium

Complete the code to declare a UINavigationController property in the MainCoordinator class.

iOS Swift

class MainCoordinator: Coordinator {
    var navigationController: [1]

    func start() {
        // Implementation
    }
}

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AUIWindow

BUIViewController

CUITabBarController

DUINavigationController

Attempts:

3 left

💡 Hint

Common Mistakes

Using UIViewController instead of UINavigationController.

Confusing UITabBarController with navigation controller.

The Coordinator holds a UINavigationController to manage navigation stack.

3fill in blank

hard

Fix the error in the start method to push a ViewController instance onto the navigation stack.

iOS Swift

func start() {
    let vc = ViewController()
    navigationController.[1](vc, animated: true)
}

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AshowDetailViewController

Bpresent

CpushViewController

DaddChild

Attempts:

3 left

💡 Hint

Common Mistakes

Using present instead of pushViewController causes modal presentation.

Using addChild is for child view controllers, not navigation.

To navigate in a UINavigationController, use pushViewController(_:animated:).

4fill in blank

hard

Fill both blanks to declare a child coordinator and add it to the childCoordinators array.

iOS Swift

class MainCoordinator: Coordinator {
    var childCoordinators = [Coordinator]()

    func startChild() {
        let child = ChildCoordinator(navigationController: navigationController)
        childCoordinators.[1](child)
        child.[2]()
    }
}

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Aappend

Bstart

Cremove

Dstop

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove instead of append to add child coordinators.

Calling stop instead of start on the child coordinator.

Child coordinators are added with append and started with start().

5fill in blank

hard

Fill all three blanks to remove a child coordinator from the array by identity.

iOS Swift

func childDidFinish(_ child: Coordinator) {
    if let index = childCoordinators.firstIndex(where: { $0 [1] child }) {
        childCoordinators.[2](at: index)
    }
    print("Coordinator [3] finished")
}

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A===

Bremove

Chas

Dremoved

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of === for identity comparison.

Using remove() without index causes error.

Printing wrong status message.

Use === to check identity, remove(at:) to remove, and print 'removed' message.