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                ## SingleChildScrollView SingleChildScrollView類似于Android中的ScrollView,它只能接收一個子Widget。定義如下: ``` SingleChildScrollView({ this.scrollDirection = Axis.vertical, //滾動方向,默認是垂直方向 this.reverse = false, this.padding, bool primary, this.physics, this.controller, this.child, }) ``` 除了通用屬性,我們重點看一下`reverse`和`primary`兩個屬性: - reverse:該屬性API文檔解釋是:是否按照閱讀方向相反的方向滑動,如:`scrollDirection`值為`Axis.horizontal`,如果閱讀方向是從左到右(取決于語言環境,阿拉伯語就是從右到左),reverse為`true`時,那么滑動方向就是從右往左。其實此屬性本質上是決定可滾動widget的初始滾動位置是在“頭”還是“尾”,取`false`時,初始滾動位置在“頭”,反之則在“尾”,讀者可以自己試驗。 - primary:指是否使用widget樹中默認的PrimaryScrollController;當滑動方向為垂直方向(`scrollDirection`值為`Axis.vertical`)并且`controller`沒有指定時,`primary`默認為`true`. ### 示例 下面是一個將大寫字母A-Z沿垂直方向顯示的例子,由于垂直方向空間不夠,所以使用SingleChildScrollView。: ``` class SingleChildScrollViewTestRoute extends StatelessWidget { @override Widget build(BuildContext context) { String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; return Scrollbar( child: SingleChildScrollView( padding: EdgeInsets.all(16.0), child: Center( child: Column( //動態創建一個List<Widget> children: str.split("") //每一個字母都用一個Text顯示,字體為原來的兩倍 .map((c) => Text(c, textScaleFactor: 2.0,)) .toList(), ), ), ), ); } } ``` 效果: ![](https://box.kancloud.cn/a5c8558b8b53f02fdf67f61c921a153b_320x504.png)
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