加酷知识源

融云iOS无法接受语音视频消息

Posted on 2021-01-27 Edited on 2021-01-28 In flutter

安卓（李某测试）拨打苹果（李朴2），进入对话界面，

弹出键盘，弹出报错,在chat_room.dart文件中

[VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: 'package:flutter/src/widgets/scroll_controller.dart': Failed assertion: line 112 pos 12: '_positions.isNotEmpty': ScrollController not attached to any scroll views.
#0      _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:46:39)
#1      _AssertionError._throwNew (dart:core-patch/errors_patch.dart:36:5)
#2      ScrollController.position (package:flutter/src/widgets/scroll_controller.dart:112:12)
#3      _ChatRoomState.didChangeMetrics (package:polars_app/pages/chat/chat_room.dart:708:27)
#4      WidgetsBinding.handleMetricsChanged (package:flutter/src/widgets/binding.dart:571:16)
#5      _rootRun (dart:async/zone.dart:1190:13)
#6      _CustomZone.run (dart:async/zone.dart:1093:19)
#7      _CustomZone.runGuarded (dart:async/zone.dart:997:7)
#8      _invoke (dart:ui/hooks.dart:251:10)
#9      _updateWindowMetrics (dart:ui/hooks.dart:53:3)

解决：在访问maxScrollExtent属性前一定要判断_scrollController.hasClients

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if (_scrollController.hasClients) {
  _scrollController.position.maxScrollExtent;
}

问题描述：

//33003	调用接口时传入的参数不正确
[RC-Flutter-IM] iOS error sendMessage 33003
  
[VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: NoSuchMethodError: The method '+' was called on null.
Receiver: null
Tried calling: +(":该消息内容为空，可能该消息没有在原生 SDK 中注册")
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
#1      MessageFactory.map2Message (package:rongcloud_im_plugin/src/util/message_factory.dart:120:40)
#2      MessageFactory.string2Message (package:rongcloud_im_plugin/src/util/message_factory.dart:27:12)
#3      RongIMClient.sendMessageWithCallBack (package:rongcloud_im_plugin/src/rong_im_client.dart:187:43)
<asynchronous suspension>
#4      RongIMClient.sendMessageCarriesPush (package:rongcloud_im_plugin/src/rong_im_client.dart:116:12)
#5      RongIMClient.sendMessage (package:rongcloud_im_plugin/src/rong_im_client.dart:92:12)
#6      _ChatRoomState._sendMessage (package:polars_app/pages/chat/chat_room.dart:2765:32)
#7      _ChatRoomState._sendMessageClick (package:polars_app/pages/chat/chat_room.dart:2144:9)
#8      _ChatRoomState._buildTextComposer.<anonymous closure>.<anonymous closure> (package:polars_app/pages/chat/chat_room.dart:2097:29)
#9      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:993:19)
#10     _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1111:38)
#11     GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:183:24)
#12     TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:598:11)
#13     BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:287:5)
#14     BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:259:7)
#15     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:157:27)
#16     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:362:20)
#17     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:338:22)
#18     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:267:11)
#19     GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:295:7)
#20     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:240:7)
#21     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:213:7)
#22     _rootRunUnary (dart:async/zone.dart:1206:13)
#23     _CustomZone.runUnary (dart:async/zone.dart:1100:19)
#24     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
#25     _invoke1 (dart:ui/hooks.dart:265:10)
#26     _dispatchPointerDataPacket (dart:ui/hooks.dart:174:5)

分析：

//走到这串代码
msg = await RongIMClient.send
//launch和login调用登录代码
  RyManager.instance.connect();
//方法内部调用  获取到的token为空
RongIMClient.connect(token)

无法连接融云，暂停；

继续调试

李朴2 userID：1174605640773193730

李某测试 userID：1107918162780569602

李某测试 (userID：1107918162780569602) android

打给

李朴2 (userID：1174605640773193730) iOS,锁屏超过一分钟

at 11:56

14：00 等待融云官方回复

app_helper——–>go web page ——->web view

ssh避免重复输入密码

Posted on 2021-01-20 In unix

解决方法：添加私钥

步骤：

切换到文件夹

cd ~/.ssh

添加秘钥

1	ssh-add id_rsa

查看秘钥

1	ssh-add -l

测试github仓库连接

1	git ls-remote -h -- git@github.com:zhangjk4859/jenkins-build-iOS.git

完。

参考：https://superuser.com/questions/988185/how-to-avoid-being-asked-enter-passphrase-for-key-when-im-doing-ssh-operatio

jenkins安装

Posted on 2021-01-20 In unix

安装
1
brew install jenkins-lts
启动
1
brew services start jenkins-lts
停止
1
brew services stop jenkins-lts
重启
1
brew services restart jenkins-lts
更新
1
brew upgrade jenkins-lts

局域网访问配置

homebrew.mxcl.jenkins.plist里面httpListenAddress从127.0.0.1更改为0.0.0.0

两个地方

~/Library/LaunchAgents/homebrew.mxcl.jenkins.plist
/usr/local/Cellar/jenkins/版本号/homebrew.mxcl.jenkins.plist

参考：https://www.jianshu.com/p/10041e79ac6f

libstdc++缺失问题

Posted on 2021-01-07 Edited on 2021-01-12 In iOS

问题：libstdc++ not found

原因：libstdc++ was deprecated 5 years ago,we should update project to use libc++

解决：更新工程或者下载库到当前工程，下载地址 https://github.com/zhangjk4859/zhangjk4859.github.io/raw/zjk/files/libstdc--master.zip 下载完成以后执行对应.sh文件即可

参考：1.https://github.com/devdawei/libstdc-

2.https://www.jianshu.com/p/e694782b8740

Xcode12,iOS14，app启动慢

Posted on 2021-01-07 Edited on 2021-01-12 In iOS

问题：启动app会白屏很长一段时间，即使是一个全新的app

解决方案：

In the Xcode menu,go to product > scheme > edit scheme
open the info tab
Uncheck the debug executables checkbox

参考：1. https://stackoverflow.com/questions/63929122/slow-app-launch-time-after-updating-to-ios-14-and-xcode-12

2.https://developer.apple.com/forums/thread/651012

Mac环境下朗文词典

Posted on 2021-01-07 Edited on 2021-01-12 In unix

原理：原生的dictionary加朗文的词库，词库需要转换，转换过程见参考链接2

参考：1. https://www.zhihu.com/question/21964466

https://kaihao.io/2018/mdict-to-macos-dictionary/

3.https://www.zhihu.com/question/20428599/answer/223511099

链表是什么

Posted on 2021-01-06 Edited on 2021-01-12 In iOS

链表了解吗

Linked list is a sequence of links which contains items
Link - Each link of a linked list can store a data called an element
Next - Each link of a linked list contains a link to the next link called Next
LinkedList - A Linked List contains the connection link to the first link called First
Linked list can be visualized as a chain of nodes,where every node points to hte next node

![image](
- Simple linked list -item navigation is forward only
- doubly linked list - items can be navigated forward and backward
- circular linked list - last item contains link of the first element as next and the first element has a link to the last element as previous.

双向链表是什么

同上，节点有前后指针

跟数组的区别

数组在编译时已经分配好连续内存
链表在运行时添加数据时分配内存
数组在栈，链表在堆

数组为什么快

数组查找快，因为可以根据索引直接获得，复杂度O(1),链表复杂度O(N)
数组插入和删除慢，因为空间连续，插入删除后需要整理内存大小，链表插入删除快，只要改变指针指向即可

参考：1. https://www.tutorialspoint.com/data_structures_algorithms/linked_list_algorithms.htm

2.https://www.studytonight.com/data-structures/linked-list-vs-array

hexo给目录分类

Posted on 2021-01-05 Edited on 2021-01-12 In unix

创建分类功能

1	hexo new page categories

打开index文件

1	/source/categories/index.md

文件添加字段

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title: categories
date: 2021-01-05 12:19:59
type: "categories"

写文章的时候加上分类标签

title: mac android studio flutter 打包 apk
date: 2020-11-16 20:16:07
categories: 
- unix
tags:

添加标签同理

完。

参考：https://www.cnblogs.com/hankleo/p/11606224.html

flutter中的websocket概念

Posted on 2021-01-05 Edited on 2021-01-12 In flutter

目的：实现客户端与服务端的实时通讯，基于TCP协议

与keep-alive区别：keep-alive机制会连接一小段时间，最终会断开，ws协议不会断开

原理：通过一条特殊的http协议请求进行握手后，服务端支持ws协议，则进行协议升级，利用http创建的tcp连接，实现长连接。

步骤分解：

连接服务器

1	final channel = IOWebSocketChannel.connect('ws://echo.websocket.org');

关闭连接
1
channel.sink.close();

监听服务器

StreamBuilder是一个组件，收到一个stream就刷新界面

new StreamBuilder(
  stream: widget.channel.stream,
  builder: (context, snapshot) {
    return new Text(snapshot.hasData ? '${snapshot.data}' : '');
  },
);

发送消息
1
channel.sink.add('Hello!');

完整demo

import 'package:flutter/material.dart';
import 'package:web_socket_channel/io.dart';

class WebSocketRoute extends StatefulWidget {
  @override
  _WebSocketRouteState createState() => new _WebSocketRouteState();
}

class _WebSocketRouteState extends State<WebSocketRoute> {
  TextEditingController _controller = new TextEditingController();
  IOWebSocketChannel channel;
  String _text = "";


  @override
  void initState() {
    //创建websocket连接
    channel = new IOWebSocketChannel.connect('ws://echo.websocket.org');
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text("WebSocket(内容回显)"),
      ),
      body: new Padding(
        padding: const EdgeInsets.all(20.0),
        child: new Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            new Form(
              child: new TextFormField(
                controller: _controller,
                decoration: new InputDecoration(labelText: 'Send a message'),
              ),
            ),
            new StreamBuilder(
              stream: channel.stream,
              builder: (context, snapshot) {
                //网络不通会走到这
                if (snapshot.hasError) {
                  _text = "网络不通...";
                } else if (snapshot.hasData) {
                  _text = "echo: "+snapshot.data;
                }
                return new Padding(
                  padding: const EdgeInsets.symmetric(vertical: 24.0),
                  child: new Text(_text),
                );
              },
            )
          ],
        ),
      ),
      floatingActionButton: new FloatingActionButton(
        onPressed: _sendMessage,
        tooltip: 'Send message',
        child: new Icon(Icons.send),
      ),
    );
  }

  void _sendMessage() {
    if (_controller.text.isNotEmpty) {
      channel.sink.add(_controller.text);
    }
  }

  @override
  void dispose() {
    channel.sink.close();
    super.dispose();
  }
}

数据类型：发送的过程中数据以frame形式存在，每一个frame都由opcode字段指定类型，客户端在收到消息时已经知道类型，会自动转换，streamBuilder.snapshot.data如果是文本，类型是string，二进制数据，类型是List,还有其他类型

参考：https://book.flutterchina.club/chapter11/websocket.html

《flutter实战》电子书

Posted on 2021-01-05 Edited on 2021-01-12 In flutter

国内第一本开源的电子书，也有实体书，特此记录

在线编辑步骤

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npm i -g gitbook-cli
gitbook install #安装本书构建所要依赖的插件
gitbook serve

来源：https://github.com/flutterchina/flutter-in-action