Flutter 混合开发系列 包含如下:

  • 嵌入原生View-Android
  • 嵌入原生View-iOS
  • 与原生通信-MethodChannel
  • 与原生通信-BasicMessageChannel
  • 与原生通信-EventChannel
  • 添加 Flutter 到 Android Activity
  • 添加 Flutter 到 Android Fragment
  • 添加 Flutter 到 iOS

每个工作日分享一篇,欢迎关注、点赞及转发。

iOS View

建议使用 Xcode 进行开发,在 Android Studio 左侧 project tab下选中 ios 目录下任意一个文件,右上角会出现 Open iOS module in Xcode

点击即可打开,打开后如下:

Runner 目录下创建 iOS View,此 View 继承 FlutterPlatformView ,返回一个简单的 UILabel

import Foundation
import Flutter class MyFlutterView: NSObject,FlutterPlatformView { let label = UILabel() init(_ frame: CGRect,viewID: Int64,args :Any?,messenger :FlutterBinaryMessenger) {
label.text = "我是 iOS View"
} func view() -> UIView {
return label
}
}
  • getView :返回iOS View

注册PlatformView

创建 MyFlutterViewFactory:

import Foundation
import Flutter class MyFlutterViewFactory: NSObject,FlutterPlatformViewFactory { var messenger:FlutterBinaryMessenger init(messenger:FlutterBinaryMessenger) {
self.messenger = messenger
super.init()
} func create(withFrame frame: CGRect, viewIdentifier viewId: Int64, arguments args: Any?) -> FlutterPlatformView {
return MyFlutterView(frame,viewID: viewId,args: args,messenger: messenger)
} func createArgsCodec() -> FlutterMessageCodec & NSObjectProtocol {
return FlutterStandardMessageCodec.sharedInstance()
}
}

AppDelegate 中注册:

import UIKit
import Flutter @UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
GeneratedPluginRegistrant.register(with: self) let registrar:FlutterPluginRegistrar = self.registrar(forPlugin: "plugins.flutter.io/custom_platform_view_plugin")!
let factory = MyFlutterViewFactory(messenger: registrar.messenger())
registrar.register(factory, withId: "plugins.flutter.io/custom_platform_view")
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
}

记住 plugins.flutter.io/custom_platform_view ,这个字符串在 Flutter 中需要与其保持一致。

嵌入Flutter

在 Flutter 中调用

class PlatformViewDemo extends StatelessWidget {
@override
Widget build(BuildContext context) {
Widget platformView() {
if (defaultTargetPlatform == TargetPlatform.android) {
return AndroidView(
viewType: 'plugins.flutter.io/custom_platform_view',
onPlatformViewCreated: (viewId) {
print('viewId:$viewId');
platforms
.add(MethodChannel('com.flutter.guide.MyFlutterView_$viewId'));
},
creationParams: {'text': 'Flutter传给AndroidTextView的参数'},
creationParamsCodec: StandardMessageCodec(),
);
}else if(defaultTargetPlatform == TargetPlatform.iOS){
return UiKitView(
viewType: 'plugins.flutter.io/custom_platform_view',
);
}
}
return Scaffold(
appBar: AppBar(),
body: Center(
child: platformView(),
),
);
}
}

上面嵌入的是 iOS View,因此通过 defaultTargetPlatform == TargetPlatform.iOS 判断当前平台加载,在 iOS 上运行效果:

设置初始化参数

Flutter 端修改如下:

UiKitView(
viewType: 'plugins.flutter.io/custom_platform_view',
creationParams: {'text': 'Flutter传给IOSTextView的参数'},
creationParamsCodec: StandardMessageCodec(),
)
  • creationParams :传递的参数,插件可以将此参数传递给 AndroidView 的构造函数。
  • creationParamsCodec :将 creationParams 编码后再发送给平台侧,它应该与传递给构造函数的编解码器匹配。值的范围:
    • StandardMessageCodec
    • JSONMessageCodec
    • StringCodec
    • BinaryCodec

修改 MyFlutterView :

import Foundation
import Flutter class MyFlutterView: NSObject,FlutterPlatformView { let label = UILabel() init(_ frame: CGRect,viewID: Int64,args :Any?,messenger :FlutterBinaryMessenger) {
super.init()
if(args is NSDictionary){
let dict = args as! NSDictionary
label.text = dict.value(forKey: "text") as! String
}
} func view() -> UIView {
return label
} }

最终效果:

Flutter 向 iOS View 发送消息

修改 Flutter 端,创建 MethodChannel 用于通信:

class PlatformViewDemo extends StatefulWidget {
@override
_PlatformViewDemoState createState() => _PlatformViewDemoState();
} class _PlatformViewDemoState extends State<PlatformViewDemo> {
static const platform =
const MethodChannel('com.flutter.guide.MyFlutterView'); @override
Widget build(BuildContext context) {
Widget platformView() {
if (defaultTargetPlatform == TargetPlatform.android) {
return AndroidView(
viewType: 'plugins.flutter.io/custom_platform_view',
creationParams: {'text': 'Flutter传给AndroidTextView的参数'},
creationParamsCodec: StandardMessageCodec(),
);
} else if (defaultTargetPlatform == TargetPlatform.iOS) {
return UiKitView(
viewType: 'plugins.flutter.io/custom_platform_view',
creationParams: {'text': 'Flutter传给IOSTextView的参数'},
creationParamsCodec: StandardMessageCodec(),
);
}
} return Scaffold(
appBar: AppBar(),
body: Column(children: [
RaisedButton(
child: Text('传递参数给原生View'),
onPressed: () {
platform.invokeMethod('setText', {'name': 'laomeng', 'age': 18});
},
),
Expanded(child: platformView()),
]),
);
}
}

在 原生View 中也创建一个 MethodChannel 用于通信:

import Foundation
import Flutter class MyFlutterView: NSObject,FlutterPlatformView { let label = UILabel() init(_ frame: CGRect,viewID: Int64,args :Any?,messenger :FlutterBinaryMessenger) {
super.init()
if(args is NSDictionary){
let dict = args as! NSDictionary
label.text = dict.value(forKey: "text") as! String
} let methodChannel = FlutterMethodChannel(name: "com.flutter.guide.MyFlutterView", binaryMessenger: messenger)
methodChannel.setMethodCallHandler { (call, result) in
if (call.method == "setText") {
if let dict = call.arguments as? Dictionary<String, Any> {
let name:String = dict["name"] as? String ?? ""
let age:Int = dict["age"] as? Int ?? -1
self.label.text = "hello,\(name),年龄:\(age)"
}
}
}
} func view() -> UIView {
return label
} }

Flutter 向 Android View 获取消息

与上面发送信息不同的是,Flutter 向原生请求数据,原生返回数据到 Flutter 端,修改 MyFlutterView onMethodCall

import Foundation
import Flutter class MyFlutterView: NSObject,FlutterPlatformView { let label = UILabel() init(_ frame: CGRect,viewID: Int64,args :Any?,messenger :FlutterBinaryMessenger) {
super.init()
if(args is NSDictionary){
let dict = args as! NSDictionary
label.text = dict.value(forKey: "text") as! String
} let methodChannel = FlutterMethodChannel(name: "com.flutter.guide.MyFlutterView", binaryMessenger: messenger)
methodChannel.setMethodCallHandler { (call, result:FlutterResult) in
if (call.method == "setText") {
if let dict = call.arguments as? Dictionary<String, Any> {
let name:String = dict["name"] as? String ?? ""
let age:Int = dict["age"] as? Int ?? -1
self.label.text = "hello,\(name),年龄:\(age)"
}
}else if (call.method == "getData") {
if let dict = call.arguments as? Dictionary<String, Any> {
let name:String = dict["name"] as? String ?? ""
let age:Int = dict["age"] as? Int ?? -1
result(["name":name,"age":age])
}
}
}
} func view() -> UIView {
return label
} }

result() 是返回的数据。

Flutter 端接收数据:

var _data = '获取数据';

RaisedButton(
child: Text('$_data'),
onPressed: () async {
var result = await platform
.invokeMethod('getData', {'name': 'laomeng', 'age': 18});
setState(() {
_data = '${result['name']},${result['age']}';
});
},
),

解决多个原生View通信冲突问题

当然页面有3个原生View,

class PlatformViewDemo extends StatefulWidget {
@override
_PlatformViewDemoState createState() => _PlatformViewDemoState();
} class _PlatformViewDemoState extends State<PlatformViewDemo> {
static const platform =
const MethodChannel('com.flutter.guide.MyFlutterView'); var _data = '获取数据'; @override
Widget build(BuildContext context) {
Widget platformView() {
if (defaultTargetPlatform == TargetPlatform.android) {
return AndroidView(
viewType: 'plugins.flutter.io/custom_platform_view',
creationParams: {'text': 'Flutter传给AndroidTextView的参数'},
creationParamsCodec: StandardMessageCodec(),
);
} else if (defaultTargetPlatform == TargetPlatform.iOS) {
return UiKitView(
viewType: 'plugins.flutter.io/custom_platform_view',
creationParams: {'text': 'Flutter传给IOSTextView的参数'},
creationParamsCodec: StandardMessageCodec(),
);
}
} return Scaffold(
appBar: AppBar(),
body: Column(children: [
Row(
children: [
RaisedButton(
child: Text('传递参数给原生View'),
onPressed: () {
platform
.invokeMethod('setText', {'name': 'laomeng', 'age': 18});
},
),
RaisedButton(
child: Text('$_data'),
onPressed: () async {
var result = await platform
.invokeMethod('getData', {'name': 'laomeng', 'age': 18});
setState(() {
_data = '${result['name']},${result['age']}';
});
},
),
],
),
Expanded(child: Container(color: Colors.red, child: platformView())),
Expanded(child: Container(color: Colors.blue, child: platformView())),
Expanded(child: Container(color: Colors.yellow, child: platformView())),
]),
);
}
}

此时点击 传递参数给原生View 按钮哪个View会改变内容,实际上只有最后一个会改变。

如何改变指定View的内容?重点是 MethodChannel,只需修改上面3个通道的名称不相同即可:

  • 第一种方法:将一个唯一 id 通过初始化参数传递给原生 View,原生 View使用这个id 构建不同名称的 MethodChannel
  • 第二种方法(推荐):原生 View 生成时,系统会为其生成唯一id:viewId,使用 viewId 构建不同名称的 MethodChannel

原生 View 使用 viewId 构建不同名称的 MethodChannel

import Foundation
import Flutter class MyFlutterView: NSObject,FlutterPlatformView { let label = UILabel() init(_ frame: CGRect,viewID: Int64,args :Any?,messenger :FlutterBinaryMessenger) {
super.init()
if(args is NSDictionary){
let dict = args as! NSDictionary
label.text = dict.value(forKey: "text") as! String
} let methodChannel = FlutterMethodChannel(name: "com.flutter.guide.MyFlutterView_\(viewID)", binaryMessenger: messenger)
methodChannel.setMethodCallHandler { (call, result:FlutterResult) in
...
}
} func view() -> UIView {
return label
} }

Flutter 端为每一个原生 View 创建不同的MethodChannel

var platforms = [];

UiKitView(
viewType: 'plugins.flutter.io/custom_platform_view',
onPlatformViewCreated: (viewId) {
print('viewId:$viewId');
platforms
.add(MethodChannel('com.flutter.guide.MyFlutterView_$viewId'));
},
creationParams: {'text': 'Flutter传给AndroidTextView的参数'},
creationParamsCodec: StandardMessageCodec(),
)

给第一个发送消息:

platforms[0]
.invokeMethod('setText', {'name': 'laomeng', 'age': 18});

交流

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