flutter集成到现有的iOS项目中

1.在iOS项目所在的同级目录下创建flutter_module独立的项目

 在终端上输入命令$ flutter create -t module flutter_module

2.在IOS项目的Podfile中添加以下代码，给工程target配置flutter相关的pods

 target 'iOSFlutterDemo' do
 flutter_application_path = '../flutter_module'
 load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')
 install_all_flutter_pods(flutter_application_path)
end

3.在flutter_module目录上执行'flutter build ios'

$ flutter build ios （flutter项目有修改的东西更新之后 如果要同步到iOS项目 需要重新 执行 flutter build ios）

4.在IOS工程目录上执行'pod install'，完成之后就可以在IOS工程中看到flutter及依赖库的Framework和源码

pod install

5.修改bitcode

6.在项目中的一个控制器中导入Flutter 创建一个按钮点击进入flutter页面

#import "HomeViewController.h"
@import Flutter;

@interface HomeViewController ()
@property (nonatomic, strong) FlutterEngine *flutterEngine;
@property(nonatomic, strong) FlutterViewController* flutterVc;
@property(nonatomic, strong) FlutterBasicMessageChannel * msgChannel;
@end

@implementation HomeViewController

- (void)viewDidLoad {
    
    [super viewDidLoad];
    
    self.view.backgroundColor = UIColor.whiteColor;
    
    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(200, 100, 140, 45)];
    btn.center = self.view.center;
    btn.backgroundColor = UIColor.redColor;
    [self.view addSubview:btn];
    [btn setTitle:@"进入flutter页面" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(goFlutter) forControlEvents:UIControlEventTouchUpInside];
    
    self.flutterVc = [[FlutterViewController alloc] initWithEngine:self.flutterEngine nibName:nil bundle:nil];
    
    self.msgChannel = [FlutterBasicMessageChannel messageChannelWithName:@"messageChannel" binaryMessenger:self.flutterVc.binaryMessenger];
    
    [self.msgChannel setMessageHandler:^(id  _Nullable message, FlutterReply  _Nonnull callback) {
        NSLog(@"收到Flutter的：%@",message);
    }];
    
}
#pragma mark - 调用flutter的页面
- (void)goFlutter{
    [self.navigationController pushViewController:self.flutterVc animated:YES];
}

-(FlutterEngine *)flutterEngine{
    if (!_flutterEngine) {//main对应main.dart

        FlutterEngine * engine = [[FlutterEngine alloc] initWithName:@"main"];
        if (engine.run) {
            _flutterEngine = engine;
        }
    }
    return _flutterEngine;
}

@end