1、已有项目工程(iOS)集成Flutter
（1）关闭Bitcode，cd到iOS工程最外层，在终端输入生成flutter工程
flutter create -t module flutter_project
结束后项目结构如下
- flutter_project
-- lib
--- main.dart
- iOS_project
-- .xcworkspace
（2）Podfile文件示例，在{}内分别填入flutter工程路径和iOS工程名称
platform :ios, '9.0'
use_frameworks!
flutter_application_path = '{flutter_project路径}'
load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')
target '{iOS项目名称}' do
install_all_flutter_pods(flutter_application_path)
end
2、iOS项目和Flutter文件的相互调用
（1）iOS工程AppDelegate文件
import UIKit
import Flutter
import FlutterPluginRegistrant
@main
class AppDelegate: FlutterAppDelegate {
let flutterMethodChannel = "flutter_channel"
lazy var flutterEngine = FlutterEngine(name: "flutter_engine")
override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
flutterEngine.run()
GeneratedPluginRegistrant.register(with: self.flutterEngine)
TYFlutterManager.register(with: self.flutterEngine.registrar(forPlugin: "TYFlutterManager")!)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
}
（2）iOS工程新建一个类TYFlutter声明通道，注册代理回调，通道名为flutter_channel
import Foundation
import Flutter
class TYFlutterManager: NSObject, FlutterPlugin {
static func register(with registrar: FlutterPluginRegistrar) {
let channel = FlutterMethodChannel(name: "flutter_channel", binaryMessenger: registrar.messenger())
let instance = TYFlutterManager()
registrar.addMethodCallDelegate(instance, channel: channel)
}
func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
if call.method == "flutterCalliOS" {
} else {
result(FlutterMethodNotImplemented)
}
}
}
（3）原生跳转Flutter页面
let flutterEngine = (UIApplication.shared.delegate as! AppDelegate).flutterEngine
let flutterVC = FlutterViewController(engine: flutterEngine, nibName: nil, bundle: nil)
flutterVC.setInitialRoute("LoginPage")
present(flutterVC, animated: true, completion: nil)
（4）Flutter调用原生，Flutter工程新建一个.dart文件flutter 调用 原生的函数，通道名也是flutter_channel，
const platform = const MethodChannel('flutter_channel');
/// 路由
/// 返回上一级
Future dismissPage() async {
var result;
try {
//传递给原生的方法名和参数
result = await platform.invokeMethod('flutterCalliOS',
{'function':'dismiss'});
//接收原生传过来的值
return Future.value(result);
} on PlatformException catch(e) {
return Future.error(e.toString());
}
}
（5）Flutter开始调用声明的函数，比如在flutter页面点击返回
() async{
var futureValue = await dismissPage();
//接收的值
print(futureValue);
})
（6）在之前iOS代理方法中就可以回调func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult)
func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
if call.method == "flutterCalliOS" {
//传给flutter的值
result();
} else {
result(FlutterMethodNotImplemented)
}
}
3、Flutter简易登录界面开发
（1）pubspec.yaml文件处理，这里集成以下框架。记得pub upgrade
dependencies:
flutter:
sdk: flutter
#风格样式
cupertino_icons: ^1.0.2
#状态管理
provider: ^6.0.2
# #Toast
fluttertoast: ^8.0.9
# #Loading框
flutter_spinkit: ^5.1.0
（2）使用Provider状态管理，提供set、get方法给外部调用
class Counter with ChangeNotifier, DiagnosticableTreeMixin {
/// 手机号
String _phoneNum = "";
/// 验证码
String _codeNum = "";
/// 验证码发送状态0:不可点击,1:可发送,2:已发送
int _codeSendStatus = 0;
/// 倒计时剩余时间
int _leftTime = 60;
/// 是否勾选协议
int _protocolAllowed = 0;
String get phoneNum => _phoneNum;
String get codeNum => _codeNum;
int get codeSendStatus => _codeSendStatus;
int get leftTime => _leftTime;
int get protocolAllowed => _protocolAllowed;
void updatePhone({required String phone}) {
_phoneNum = phone;
if (_codeSendStatus != 2) {
_leftTime = 60;
_codeSendStatus = (phoneNum.length == 11) ? 1 : 0;
}
notifyListeners();
}
void updateCode({required String code}) {
_codeNum = code;
if (_codeSendStatus != 2) {
_codeSendStatus = (phoneNum.length == 11) ? 1 : 0;
}
notifyListeners();
}
void updateSendStatus({required int status}) {
_codeSendStatus = status;
notifyListeners();
}
void updateLeftTime({required int left}) {
_leftTime = left;
notifyListeners();
}
void updateProtocolAllowed({required int allow}) {
_protocolAllowed = allow;
print("allow $allow");
notifyListeners();
}
@override
void debugFillProperties(DiagnosticPropertiesBuilder properties) {
// TODO: implement debugFillProperties
super.debugFillProperties(properties);
properties.add(StringProperty('phoneNum', phoneNum));
properties.add(StringProperty('codeNum', codeNum));
properties.add(IntProperty('codeSendStatus', codeSendStatus));
properties.add(IntProperty('leftTime', leftTime));
properties.add(IntProperty('protocolAllowed', protocolAllowed));
}
}
（3）登录界面开发，代码太多，只放部分有和原生交互的。
///Flutter调用原生获取验证码
Future requestPhoneCode({phone:String}) async {
var result;
try {
result = await platform.invokeMethod('flutterCalliOS',
{"function":"phoneCode", "params":"{\"phone\":\"$phone\"}"});
return Future.value(result);
} on PlatformException catch(e) {
return Future.error(e.toString());
}
}
LoginTxt(
key: codeTxtKey,
leftTitle: "验证码",
showClearBtn: true,
showCountDown: true, hintText: "输入验证码", textChangeCallBack: (code) {
codeNum = code;
context.read<Counter>().updateCode(code: code);
}, maxLength: 4, clearCB: (){
codeNum = "";
context.read<Counter>().updateCode(code: "");
}, sendCodeCB: () async{
tLoadingShow(context, "发送中...");
var val = await requestPhoneCode(phone: phoneNum);
tLoadingDismiss(context);
codeTxtKey.currentState!.beginCountDown();
if (val == "1") {
tToast(context, "验证码已发送");
} else {
tToast(context, "验证码发送失败");
}
},)
///Flutter返回原生
Future dismissPage() async {
var result;
try {
result = await platform.invokeMethod('flutterCalliOS',
{'function':'dismiss'});
return Future.value(result);
} on PlatformException catch(e) {
return Future.error(e.toString());
}
}
tyTextButtonFactory(
Text(""),
tyTransparentColor(), () async{
var futureValue = await dismissPage();
print(futureValue);
})
（4）交互效果
flutterDemo.gif
4、思考
在已有的项目中集成Flutter，业务耦合性低比如交互少、业务关联小的模块，可以考虑。
