Скачать или смотреть Convert JSON Array of Numbers into CGPoints in Objective-C or Swift

Learn how to transform a JSON array from an API into an array of `CGPoints` for effective use in Core Graphics with Swift or Objective-C.
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Convert JSON Array of Numbers into CGPoints in Objective-C or Swift

If you're developing an application that utilizes data from an API to generate visualizations with Core Graphics, you may find yourself needing to convert a JSON array of numbers into CGPoints. This process is essential for graphical representation, especially when working with stock data or similar datasets. In this guide, we will walk you through a practical solution for converting JSON data that consists of date and closing values into CGPoints.

The Problem

You received JSON data formatted like this:

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Your goal is to extract the date and close values and convert them into an array of CGPoints, such that the result is formed like this:

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

This solution will leverage Swift's powerful Codable functionality to decode JSON effectively.

The Solution

1. Defining Your Data Structure

You can use a struct that conforms to the Codable protocol to define your data model:

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

This structure captures all relevant fields in the JSON, allowing you to decode it easily.

2. Decoding the JSON

Next, use the JSONDecoder to decode your JSON string into an array of StockReport:

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

3. Creating CGPoints from Stock Data

Once you have your data in an array, you can iterate over it to create the CGPoints:

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

4. Understanding the Output

When you execute the provided code, the output will be:

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

This neatly converts your date-indexed closing values to corresponding CGPoints, ready to be utilized in your Core Graphics visualizations.

Conclusion

In summary, converting a JSON array of numbers into CGPoints in Swift is straightforward if you follow the outlined steps. With the power of Codable, along with Swift's capabilities, you can manage and manipulate stock data effectively for graphics rendering. If you have additional questions or need further clarification, don't hesitate to reach out!