View Destroy，RadarChartView not releasing, memory leak. Is there a solution?

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## What did you do?

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## What did you expect to happen?

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## What happened instead?

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## DGCharts Environment

**DGCharts version/Branch/Commit Number:**
**Xcode version:**
**Swift version:**
**Platform(s) running DGCharts:**
**macOS version running Xcode:**

## Demo Project

ℹ Please link to or upload a project we can download that reproduces the issue.

Start at RadarChartView and reproduce its destruction in an iOS project while observing whether the view is released. The issue provides no demo project, environment details, expected behavior, or named tests; done would require a confirmed reproduction and evidence that RadarChartView is released without a memory leak.

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