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並前往https://www.fluttercampus.com/guide/131/how-to-use-conditional-statement-if-else-on-widget-in-flutter/

How to use Conditional Statement (IF ELSE) on Widget in Flutter

But in Flutter, we can't place if…else statement directly on child attribute ... class _MyAppState extends State<MyApp> { int y = 5; @override Widget ...

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