Скачать или смотреть Creating a Custom CallBack Button with Void Functions in Swift

Learn how to create a custom callback function with void functions in Swift to enhance user experience in your iOS applications with bottom sheets.
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This video is based on the question https://stackoverflow.com/q/74512880/ asked by the user 'Bima J Hermid' ( https://stackoverflow.com/u/20325604/ ) and on the answer https://stackoverflow.com/a/74514449/ provided by the user 'Zeeshan Ahmad II' ( https://stackoverflow.com/u/14260241/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Custom CallBack Button with Void Functions in Swift

In the world of iOS development, callbacks are an essential mechanism that allows one part of your application (such as a ViewController) to notify another part (or another ViewController) of events or changes. This guide will guide you on how to create a custom callback button using a Void function in Swift, particularly in the context of using a bottom sheet in a view controller.

Understanding the Problem

Let's say you have two ViewControllers in your application, and one of them serves as a bottom sheet for the other controller. You want to implement a callback function that triggers an action when the bottom sheet appears. This is where understanding how Void functions work in Swift is important.

What is a Void Function?

A Void function in Swift is a function that does not return any value. It can be defined using an arrow -> syntax that indicates it returns Void. This is often used for methods that simply perform an action without needing to return a result. For example:

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In Swift, you can also simply omit the -> Void, as the following is equivalent:

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Implementing a CallBack Function with a Bottom Sheet

To achieve your goal of making a callback function work with your bottom sheet, you will need to set it up in your InfoSheeetViewController. Here's a step-by-step guide on how to do it.

Step 1: Set Up the Bottom Sheet View Controller

In your InfoSheeetViewController, add a property to hold your callback function:

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After setting up your UI, implement the button action where you will dismiss the bottom sheet and call the callback function:

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Step 2: Present the Bottom Sheet from Another ViewController

This can be done easily using both Storyboard and programmatically.

Using Storyboard

If you are using Storyboards, instantiate your InfoSheeetViewController like this:

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Without Storyboard

If you prefer to present it programmatically, do it like this:

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Step 3: Detecting When the Bottom Sheet Shows Up

You can also utilize Swift's built-in completion handler in the present method to detect when the bottom sheet appears. Here’s how you can do that:

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Conclusion

By following the steps outlined above, you can create a custom callback button in Swift using Void functions effectively. This not only enhances the functionality of your app but also improves the user experience by allowing to react to UI changes seamlessly. If you're looking to implement callbacks in your app, don't hesitate to experiment with the provided examples! Happy coding!