导航器弹出错误，直到：“！_debugLocked 不正确

Question

每当我运行应用程序时，主屏幕最多只显示 5 秒，并且没有点击，我导航到另一个页面。 其中第二页是商品详情页，第一页商品按分类显示。

                itemBuilder: (context, index) => ItemCard(
                  product: products[index],
                  press: () => Navigator.push(
                      context,
                      MaterialPageRoute(
                        builder: (context) => DetailsScreen(
                          product: products[index],
                        ),
                      )),
                )),
          ),
        ),
      ],
    );
  }
}```

错误：

The following assertion was thrown while handling a gesture:
Assertion failed: file:///C:/src/flutter/flutter/packages/flutter/lib/src/widgets/navigator.dart:4842:12
!_debugLocked
is not true

Answer 1

您必须确保在导航之前已构建小部件树，您可以通过像这样扭曲您的函数来做到这一点

WidgetsBinding.instance.addPostFrameCallback((_) {

Navigator.push(context, MaterialPageRoute(builder: (_) => 
     MyPage()));

});