总结 for-in循环是Dart语言中常用来遍历数据结构的方法之一。在Flutter开发中,也可以使用该循环来处理List、Set或Map等数据结构。
Widget build(BuildContext context) { return InkWell( // Enables taps for child and add ripple effect when child widget is long pressed. onTap: onItemTap, child: ListTile( // Useful standard widget for displaying something in ListView. leading: Icon(model.icon), title: Text(model.title), )...
void main() {// 声明一个固定长度的集合List<int> numList = List(5);numList[0] = 1;numList[1] = 2;numList[2] = 3;numList[3] = 4;numList[4] = 5;print('遍历元素:');for (int value in numList) {print(value);}print('---更新第一个元素为 10---');numList[0] = 10;print('...
stream = stream.skipWhile((data) => data<5); await for (int i in stream) { print(i); } } Stream.toList() 将流中所有的数据收集存放在List中,并返回 Future<List>对象,listData里面 0-91.这个是一个异步方法,要结果则需要使用await关键字 这个是等待Stream当流结束时,一次返回结果 void _stream...
Widgetbuild(BuildContext context){returnScaffold(appBar:AppBar(title:Text(widget.title),),body:ListView.builder(// Widget which creates [ItemWidget] in scrollable list.itemCount:_items.length,// Number of widget to be created.itemBuilder:(context,itemIndex)=>// Builder function for every item...
在Delphi中,没有办法使用for/in语法来遍历范围(range)。for/in语法主要用于遍历集合类型,如数组、列表等。在Delphi中,可以使用传统的for循环来遍历范围。 例如,如果要遍历一个整数范围,可以使用如下代码: 代码语言:delphi 复制 var i: Integer; begin
我尝试将SQLiteMethods.getRecord中的项目显示为Widget中的recordId。希望这能帮上忙。
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A SimpleDialog is designed to show options in a list (as opposed to an AlertDialog, which is meant to notify the user of something). Here is a simple example: The process of creating a SimpleDialog is basically the same as for an AlertDialog (they are both based on Dialog), except that...