flutter pub add transparent_image根據套件公開資料產生的選型評估，僅供參考。
一個輕量級的 Dart 套件，提供透明圖像作為 Uint8List，適用於 UI 開發中的佔位符圖像。它能在多個平台上一致地渲染無形或透明的圖像，而無需外部資源。非常適合測試、版面原型設計，或在不需要視覺內容的情況下需要圖像佔位符的場景。該套件與平台無關，可順暢整合至 Flutter 應用中。
以下為關聯原始碼儲存庫的 README 原文快照，最新內容請造訪原始碼儲存庫。
A simple transparent image. Represented as a Uint8List, which was originally extracted from the Flutter codebase (was private in the test package).
It's a silly, simple library, but I found I needed transparent images in a few projects and found this is the simplest way to represent it :)
This package exports one constant: kTransparentImage.
Displays the transparent image.
Image.memory(kTransparentImage);
MemoryImage(kTransparentImage);
A more useful example, and the reason I originally extracted this from the Flutter codebase!
A complete example can be seen on the Flutter website.
FadeInImage.memoryNetwork(
placeholder: kTransparentImage,
image: 'https://picsum.photos/250?image=9',
),
);