企业网站制作教程视频/营销型网站的公司

1、键盘弹起不会压缩页面（页面不会跟键盘弹出相应布局）

Scaffold(resizeToAvoidBottomPadding: false,child: TextField())

2、点击其他位置取消输入框焦点

Scaffold(// resizeToAvoidBottomPadding: false,body: GestureDetector(behavior: HitTestBehavior.translucent,onTap: () {// 触摸收起键盘FocusScope.of(context).requestFocus(FocusNode());},child: TextField()
))

3、返回键获取

WillPopScope(onWillPop: () {// 关闭上文close(context);// 返回一个false到then中return Future.value(false);},child: Container()
)

4、复杂多动画简单动画函数示例

class TestPage extends StatefulWidget{@overrideTestPageState createState() {return new TestPageState();}
}
class TestPageState extends State<TestPage>with TickerProviderStateMixin {AnimationController _controller;Animation _animation;Animation _curve;double _top = 0.0;void startAnimation(end) {_controller = AnimationController(duration: const Duration(milliseconds: 400),debugLabel: 'preview banner',vsync: this,);_curve = CurvedAnimation(curve: Curves.easeOut, parent: _controller);_animation = Tween(begin: _top,end:end,).animate(_curve)..addListener((){setState((){//刷新重要_top = _animation.value;});})..addStatusListener((AnimationStatus status) {});// 运动_controller.forward();}@overridevoid initState() {startAnimation();super.initState();}@overrideWidget build(BuildContext context) {return Scaffold(body: SizedBox.expand(child: Stack(children: [RaisedButton(child: Text('点我'),onPressed(){startAnimation(_top + 50.0);}),Position(right: 40.0,top: _top,Container(color: Colors(0xffaaaaaa),height:50.0,width:50.0))])));}
}

5、简单动画简单示例

class TestPage extends StatefulWidget{@overrideTestPageState createState() {return new TestPageState();}
}
class TestPageState extends State<TestPage>with SingleTickerProviderStateMixin {AnimationController _controller;Animation _animation;Animation _curve;double _top = 50.0@overridevoid initState() {_controller = AnimationController(duration: const Duration(milliseconds: 400),debugLabel: 'preview banner',vsync: this,);_curve = CurvedAnimation(curve: Curves.easeOut, parent: _controller);startAnimation(50.0);super.initState();}void startAnimation(end) {_animation = Tween(begin: _top,end:end,).animate(_curve)..addListener((){//重要_top = _animation.value;})..addStatusListener((AnimationStatus status) {});_controller.forward();}
//  ......
}

6、自己写数据通讯，应该怎么写？

/// 定义控制器
import 'package:flutter/foundation.dart';class counterController<T> extends ValueNotifier<List<T>> {counterController(this.value) : super(value);counterController.fromValue(List<T> value) : super(value ?? List<T>());List<T> value;/// Set the controller to only contain this imagesetOne(index,T value) {value[index] = value;notifyListeners();}addOne(T value) {value.add(value);notifyListeners();}
}
/// 使用
/// statefulwidget下监听（记得取消监听）
initState() {controller?.addListener((){if (_effectiveController.value != value)didChange(_effectiveController.value);});
}/// 渲染(直接使用controller)
controller.value/// 触发
controller.addOne(123);

7、绑定成功后返回某个widget的高度

  /// 新建一个全局keyfinal GlobalKey _boxKey = GlobalKey();@overridevoid initState() {super.initState();/// 这里就是重点，挂载完毕后回调到getBoxHeight函数WidgetsBinding.instance.addPostFrameCallback(getBoxHeight);}Container(key： _boxKey)