Скачать или смотреть Programmatically Add, Remove, and Change` UIView Classes in Swift 4

Discover how to programmatically add, assign, and remove UIViews with different classes in Swift 4. Learn to dynamically change views in a simple UIViewController setup!
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Programmatically Add, Remove, and Change` UIView Classes in Swift 4

Creating dynamic user interfaces is an essential skill for any iOS developer. One common task is to programmatically add and remove UIViews in a UIViewController, particularly when you want to dynamically change the class of the view being displayed. In this guide, we'll explore how to achieve this using Swift 4.

The Problem

You may find yourself in a situation where you need to:

Add a UIView to your view controller.

Assign a class to that UIView.

Remove the UIView when needed.

Repeat the process with a different class.

You might think of it in pseudocode like this:

[[See Video to Reveal this Text or Code Snippet]]

However, the Swift programming language has specific rules about how objects can be created and utilized, which adds a layer of complexity to this task.

The Solution

Let's break it down into manageable steps to efficiently create and manipulate UIViews in your UIViewController.

Step 1: Understand Class Instantiation

In Swift, you cannot create an instance of a class from a string. Instead, you have to define the precise class you want to instantiate. This means that in your button action methods, you’ll explicitly specify which class you want to create.

Step 2: Create the UIView and Assign the Class

Here's how you can implement the required functionality in your UIButton actions:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Removing the Current View

You will need to implement the logic to remove the current UIView before adding a new one. This can be done with a simple helper function:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following this approach, you can easily switch between different UIView classes in your UIViewController. Although it may seem limiting that you cannot create classes through string references, Swift's design encourages clarity and safety in code.

In summary:

Instantiate classes explicitly instead of using strings.

Manage your views by adding and removing them as needed using helper methods.

This pattern enhances code readability and maintainability, making your user interface dynamic and responsive.

With this knowledge, you can now efficiently add, remove, and change UIView classes in your iOS applications. Happy coding!