iOS风格的alert dialog
CupertinoAlertDialog({ Key key, this.title, this.content, this.actions = const <Widget>[], this.scrollController, this.actionScrollController, this.insetAnimationDuration = const Duration(milliseconds: 100), this.insetAnimationCurve = Curves.decelerate, })
title: Text("这是一个iOS风格的对话框"),
content: SizedBox(),
actions: <Widget>[],
默认 null,一般不需要
默认 null,一般不需要