使用flutter_picker时提示 The method 'showBottomSheet' was called on null, 错误, 导致使用showPickerIcons时不显示, 这边记录一下解决问题的方式:
1. 首先定义一个参数 final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
2. 在Scaffold中有个参数key, 设置 key:_scaffoldKey;
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