Скачать или смотреть Drawing Two Dots and a Line Between Them in SwiftUI

Learn how to successfully draw two dots and connect them with a line in `SwiftUI`. Discover common pitfalls and solutions for coordinate handling in your iOS projects.
---
This video is based on the question https://stackoverflow.com/q/70885668/ asked by the user 'user3069232' ( https://stackoverflow.com/u/3069232/ ) and on the answer https://stackoverflow.com/a/70892556/ provided by the user 'burnsi' ( https://stackoverflow.com/u/6950415/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Drawing 2 dots and a line between them in SwiftUI

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Drawing Two Dots and a Line Between Them in SwiftUI

Creating visually engaging user interfaces is one of the many powerful features of SwiftUI. However, handling dynamic elements and ensuring that they behave as expected can sometimes be tricky. A common scenario involves drawing two dots at random positions on the screen and connecting them with a line. In this guide, we will explore how to achieve this and walk through a solution for a common issue encountered when attempting to draw lines between these dots.

The Problem

In many cases, developers may try to draw random dots on the screen and connect them with a line. However, they may encounter unexpected behavior, such as lines not being drawn correctly or inconsistent coordinates. Here's the main question that brings us to this topic:

How do you correctly draw two dots at random places and connect them with a line in SwiftUI?

Understanding the Setup

To illustrate this functionality, the initial code snippet provided points out a few key components:

State Variables: These are used to store the coordinates of the dots.

Circle Views: Each dot is represented by a circle.

GeometryReader: This allows gathering the position of the circles when they appear.

Random Positioning: Dots are positioned randomly on the screen.

However, a deeper inspection of this approach reveals a problem. Let’s break down what is happening.

The Solution

The issue is primarily related to when and how coordinates are being captured and utilized. In the initial code, the onAppear() modifier is causing circles to be redrawn without their positions being updated properly. Here’s how we can resolve the issue step-wise.

1. Capture Coordinates Properly

Instead of relying on onAppear() within each circle, we should capture coordinates only once when all circles are drawn. This requires restructuring the logic slightly.

Improved Code Structure

Here’s a modified version of the original code that resolves the issue:

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

2. Initialize with Random Coordinates

For an even more robust solution, you could initialize the coordinates randomly rather than capturing them with an on-screen appearance. This can help avoid any side effects from View updates occurring multiple times.

Key Takeaways

Modify State Before Drawing: Ensure that the coordinates are properly calculated before drawing action occurs.

Helper Function: Use functions to clean up the code, making it easy to handle positioning and drawing logic.

By following these guidelines, you can successfully create a functional user interface with dynamic drawings in SwiftUI without running into the issues of improper state management.

Now you’re all set! Enjoy creating your SwiftUI masterpieces with visually appealing dynamic connections!