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iOS14 CoreGraphics 描画互換問題

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開発アプリのiOS14の動作検証をしている時に、CoreGraphics の描画に互換性の問題がある事を発見したので、ここに記録しておくことにします。第三者が確認できるように、サンプルプロジェクトへのリンクも貼っておく事にします。

以下のように、iOS13とiOS14 では描画結果に違いがある場合があります。どちらも不透明度付きで一筆書きで書かれていますが、結果に違いがある事が窺えます。

iOS 13

iOS14

検証用プロジェクト

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