flutter 自定义 Appbar

最近用的很好的Appbar工具类分享一下

下面是方法名意思

1.backAppbar 仅含 左侧返回按钮 及中间标题
2.baseNoBackAppbar 仅含 及中间标题

3.baseRTextAppbar backAppbar 仅含 左侧返回按钮 及中间标题 右边是文字比如（确定按钮）

4.baseRImageAppbar仅含 左侧返回按钮 及中间标题 右边是图片比如（确定按钮）

5.baseRWidgetAppbar 仅含 左侧返回按钮 及中间标题 右边自定义view

调用（这个特殊怕你们不会）

appBar: BaseAppbar().baseRWidgetAppbar(context,Constants.tuwenVxTitle, [
  方法名
]),

6.baseCRWidgetAppbar自定义 左侧返回按钮 中间自定义view 右边自定义view

appBar: BaseAppbar().baseCRWidgetAppbar(context,
  Container(里面的不写了哈哈
        ),
    [

    ] ),

/








import 'package:flutter/material.dart';
import 'package:flutter_mvp/app/application.dart';
import 'package:flutter_mvp/utils/dio/constants/constants.dart';

/**

 * flutter 自定义 backAppbar
 */
typedef _CallBack = void Function();
class BaseAppbar {

  /**
   * 仅含 左侧返回按钮 及中间标题
   * appBar: TitleBar().backAppbar(context, '个人资料'),
   */
   _CallBack  callback;
    backAppbar(BuildContext context, String title,{VoidCallback onPressed}) {
    return PreferredSize(
        preferredSize: Size.fromHeight(50),
        child: AppBar(
            backgroundColor:Color(Application.colorInt)
           ,centerTitle: true,
            title: Text(title ,   style: TextStyle(
              color: Colors.white,
              fontSize: Constants.appBarTitleSize,
            ),
            ),

            leading:   GestureDetector(
                behavior: HitTestBehavior.opaque,
                onTap: () {
                  Navigator.of(context).pop("update");
                }, child:Container(

              alignment: Alignment.center,
              padding: EdgeInsets.all(10), // 设置边距
              child: Image.asset(Constants.imagePath +"base_titlebar_back.png",
                width:30,height: 30,
              ),

            )),
        ),
        );
  }

  baseNoBackAppbar(BuildContext context, String title) {
    return PreferredSize(
      preferredSize: Size.fromHeight(48),
      child: AppBar(
        elevation: 0,  //默认是4， 设置成0 就是没有阴影了
        backgroundColor:Color(Application.colorInt)
        ,centerTitle: true,
        title: Text(title ,   style: TextStyle(
          color: Colors.white,
          fontSize: Constants.appBarTitleSize,
        ),
        ),
    ));
  }



  /**
   * 自定义AppBar右边是标题
   */
  baseRTextAppbar(BuildContext context,String title,String rtitle, {Null Function() callback}) {
    return PreferredSize(
        preferredSize: Size.fromHeight(48),
        child: AppBar(
        backgroundColor:Color(Application.colorInt)
        ,centerTitle: true,
        title: Text(title ,   style: TextStyle(
        color: Colors.white,
        fontSize: Constants.appBarTitleSize,
        ),
        ),

        leading:GestureDetector(

        behavior: HitTestBehavior.opaque,
        onTap: () {
        Navigator.of(context).pop("update");
        }, child:Container(

        alignment: Alignment.center,
        padding: EdgeInsets.all(10), // 设置边距
        child: Image.asset(Constants.imagePath +"base_titlebar_back.png", width: Constants.appBarBackSize,height:Constants.appBarBackSize,
        ),
        )),
        actions: [
         GestureDetector(
        onTap: (){
          if(callback!=null){
            callback();
          }
        },


        child: Container(
          padding: EdgeInsets.only(right: 10),
        alignment: Alignment.center,
        child: Text(
        rtitle,
        textAlign: TextAlign.center,
        style: const TextStyle(
        color: Colors.white,
        fontSize: 20.0,
        fontWeight: FontWeight.w400, //字体宽度。

        ),
        ),
        ),
        ),
    ]));

  }
   /**
    * 自定义AppBar右边两个图片
    */
   baseRImageAppbar(BuildContext context,String title,String rimageStr, {Null Function() callback}) {
     return PreferredSize(
         preferredSize: Size.fromHeight(48),
         child: AppBar(
             backgroundColor:Color(Application.colorInt)
             ,centerTitle: true,
             title: Text(title ,   style: TextStyle(
               color: Colors.white,
               fontSize: Constants.appBarTitleSize,
             ),
             ),

             leading:GestureDetector(

                 behavior: HitTestBehavior.opaque,
                 onTap: () {
                   Navigator.of(context).pop("update");
                 }, child:Container(

               alignment: Alignment.center,
               padding: EdgeInsets.all(10), // 设置边距
               child: Image.asset(Constants.imagePath +"base_titlebar_back.png", width: Constants.appBarBackSize,height:Constants.appBarBackSize,
               ),
             )),
             actions: [
               GestureDetector(
                 onTap: () {
                   if (callback != null) {
                     callback();
                   }
                 },
                 child: Container(
                   padding: EdgeInsets.only(right: 10),
                   child: Image.asset(rimageStr,
                       width: Constants.appBarBackSize),
                 ),
               )
             ]));

   }


   /**
    * 自定义AppBar 右边自定义view
    */


   baseRWidgetAppbar(BuildContext context,String title, List childWidget) {
     return PreferredSize(
         preferredSize: Size.fromHeight(48),
         child: AppBar(
             backgroundColor:Color(Application.colorInt)
             ,centerTitle: true,
             title: Text(title ,   style: TextStyle(
               color: Colors.white,
               fontSize: Constants.appBarTitleSize,
             ),
             ),

             leading:GestureDetector(

                 behavior: HitTestBehavior.opaque,
                 onTap: () {
                   Navigator.of(context).pop("update");
                 }, child:Container(

               alignment: Alignment.center,
               padding: EdgeInsets.all(10), // 设置边距
               child: Image.asset(Constants.imagePath +"base_titlebar_back.png", width: Constants.appBarBackSize,height:Constants.appBarBackSize,
               ),
             )),
             actions: childWidget));

   }



   /**
    * 自定义AppBar 中间自定义view 右边自定义view
    */

   baseCRWidgetAppbar(BuildContext context,Widget centerWidget, List childWidget) {
     return PreferredSize(

         preferredSize: Size.fromHeight(48),
         child: AppBar(
             backgroundColor:Color(Application.colorInt)
             ,centerTitle: true,
             title: centerWidget,
             leading:GestureDetector(
                 behavior: HitTestBehavior.opaque,
                 onTap: () {
                   Navigator.of(context).pop("update");
                 }, child:Container(

               alignment: Alignment.center,
               padding: EdgeInsets.all(10), // 设置边距
               child: Image.asset(Constants.imagePath +"base_titlebar_back.png", width: Constants.appBarBackSize,height:Constants.appBarBackSize,
               ),
             )),
             actions: childWidget));

   }







  /**
   * 关闭页面
   */
  _popThis(BuildContext context){
    Navigator.of(context).pop();
  }

}

下面是调用代码

 

appBar:  BaseAppbar().baseNoBackAppbar(context, '111'),

 

appBar: BaseAppbar().baseRImageAppbar(context,serchStr,  Constants.imagePath+"base_titlebar_add.png",callback: () {
 写自己的方法
}),

这里只写2个调用方法