Flutter 基础控件 SnackBar

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Flutter 基础控件 SnackBar

/// SnackBar 示例
class SnackBarDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("SnackBar 示例"),
        ),
        body: Builder(builder: (context) {
          return Container(
            child: Center(
              child: RaisedButton(
                onPressed: () {
                  Scaffold.of(context).showSnackBar(
                      SnackBar(
                        content: Text("RaisedButton 被点击了"),
                        // 添加了操作事件，如果不需要可以不添加
                        action: SnackBarAction(label: "我知道了", onPressed: () {
                          print("我知道了");
                        }),
                      )
                  );
                },
                child: Text("你点我呀！"),
              ),
            ),
          );
        })
    );
  }
}

效果

注意点

当BuildContext在Scaffold之前时，调用Scaffold.of(context)会报错。这时可以通过Builder Widget来解决
异常： Another exception was thrown: Scaffold.of() called with a context that does not contain a Scaffold.

 body: Builder(builder: (context) {
 	retrun ...;
 }