背景介紹：OC的iOS項目浮创，集成flutter模塊
注意忧吟，下文中"iOS項目"指將要集成flutter的原生項目，“.ios項目”指由flutter工程生成的被集成項目

準(zhǔn)備工作：

1斩披，flutter工程（第三方的溜族，或者其他同事開發(fā)的，需要集成到iOS項目的flutter工程）
2垦沉，本地flutter環(huán)境煌抒，建議與flutter工程的版本保持一致，不然后續(xù)會有兼容問題
3厕倍，iOS工程寡壮。
4，cocoapods環(huán)境

集成項目：

1，flutter項目編譯：

注意編譯出來的文件夾是隱藏的况既，可以用shift+command+.來顯示隱藏文件夾
終端cd到flutter路徑內(nèi)这溅，執(zhí)行命令：flutter run 。
無報錯：則生成了可用于集成的.iOS項目.ios文件夾默認(rèn)為隱藏狀態(tài)棒仍。生成后的flutter工程如下所示：

image.png

添加swift依賴.png

2铆铆，集成到iOS項目中：

2.1 修改iOS項目中的Podfile文件：（若iOS項目未使用cocoapods，需要新建Podfile文件丹喻，）
增加以下選中內(nèi)容：主要目的是按照所編輯路徑將上一步中的.ios項目集成到iOS項目中

截屏2022-06-27 上午10.08.47.png

image.png

3，代碼調(diào)用：

代碼部分主要分為兩部分：
1藏研，配置啟動器敬矩。
目前項目使用FlutterEngineGroup用以實現(xiàn)復(fù)合的flutter頁面集成。單一flutter項目也可以使用
FlutterEngine
在Appdelegate.h中添加：

#import <Flutter/Flutter.h>

//@property (nonatomic,strong) FlutterEngine *flutterEngine;
@property (nonatomic,strong) FlutterEngineGroup *flutterEngineGroup;

在Appdelegate.m中添加：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    .....
  
    self.flutterEngineGroup = [[FlutterEngineGroup alloc] initWithName:@"flutterGroupName" project:NULL];
    //若只有單一flutter頁面遥倦，也可以用以下代碼
    //FlutterEngine:
//    self.flutterEngine = [[FlutterEngine alloc] initWithName:@"my flutter engine"];
//    [self.flutterEngine run];
//    [GeneratedPluginRegistrant registerWithRegistry:self.flutterEngine];
    return YES;
}

2谤绳，生成頁面及通道占锯。
以flutter里面提供了頁面page_one，通道名稱page_One_channal為例子缩筛。
flutter頁面為繼承FlutterViewController的類消略。
自定義類：XYFlutterViewController：
XYFlutterViewController.h代碼：

#import <Flutter/Flutter.h>

NS_ASSUME_NONNULL_BEGIN
    
    @interface XYFlutterViewController : FlutterViewController
    
    //返回flutter頁面
    +(XYFlutterViewController *)flutterPageWithName:(NSString *)name;
@end

NS_ASSUME_NONNULL_END

FlutterMethodChannel：通道，flutter與原生交互依賴通道瞎抛，一般每個flutter頁面維護一個通道
setMethodCallHandler：給通道注冊方法艺演，調(diào)用原生內(nèi)容
invokeMethod：原生使用通道調(diào)用flutter內(nèi)的方法。
XYFlutterViewController.m代碼：

#import "AppDelegate.h"http://主要用來獲取全局flutterEngineGroup
#import <FlutterPluginRegistrant/FlutterPluginRegistrant-umbrella.h>
#import "XYFlutterViewController.h"

@interface XYFlutterViewController ()
@property (strong,nonatomic)FlutterMethodChannel *Channel;
@property (strong,nonatomic)NSMutableDictionary *flutterMCDic;//FlutterMethodChannel集合
@end

@implementation XYFlutterViewController

//懶加載flutter的MethodChannel桐臊，有則取胎撤，無則創(chuàng)建
/*
name為flutter約定的的通道名稱
*/
-(FlutterMethodChannel *)flutterMethodChannelWithName:(NSString *)name
{
    if (self.flutterMCDic[name]) {
        return self.flutterMCDic[name];
    }
    FlutterMethodChannel *notifationChannel = [FlutterMethodChannel methodChannelWithName:name binaryMessenger:self];
    [self.flutterMCDic setObject:notifationChannel forKey:name];
    return notifationChannel;
}
-(NSMutableDictionary *)flutterMCDic
{
    if (!_flutterMCDic) {
        _flutterMCDic = [NSMutableDictionary new];
    }
    return _flutterMCDic;
}

-(void)dealloc
{
    [self.flutterMCDic removeAllObjects];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}


/*
name為flutter提供的頁面名稱,以page_one頁面為例子，通道名稱為page_One_channal
*/
+(XYFlutterViewController *)flutterPageWithName:(NSString *)name
{
    FlutterEngine *flutterEngine = [((AppDelegate *)UIApplication.sharedApplication.delegate).flutterEngineGroup makeEngineWithEntrypoint:name libraryURI:nil];
    [GeneratedPluginRegistrant registerWithRegistry:flutterEngine];
    XYFlutterViewController *flutterViewController = [[XYFlutterViewController alloc] initWithEngine:flutterEngine nibName:nil bundle:nil];

    //頁面添加通道,page_One參數(shù)為futter中設(shè)置的
    if ([name isEqualToString:@"page_One"]) {
        [flutterViewController addActionWithName:@"page_One_channal"];
    }
}

/*
name為flutter約定的的通道名稱
*/
-(void)addActionWithName:(NSString *)name
{
    //call.method   flutter方法名
    //call.arguments  flutter給到的參數(shù)
    FlutterMethodChannel *notifationChannel = [self flutterMethodChannelWithName:name];
    //設(shè)置回調(diào)：以方法1：userChannel 方法2：jumpChannel為例
    [notifationChannel setMethodCallHandler:^(FlutterMethodCall * _Nonnull call, FlutterResult  _Nonnull result) {
        //userChannel方法：需要數(shù)據(jù)回調(diào)：
        if ([@"userChannel" isEqualToString:call.method]) {
            NSDictionary *dic =  @{
                 @"userId":@"****",
            };
            result(dic);
        }else if ([@"jumpChannel" isEqualToString:call.method]) {
        //jumpChannel方法：從flutter頁面調(diào)用原生頁面
            UIViewController *vc = [UIViewController new];
            vc.hidesBottomBarWhenPushed = YES;
            [self.navigationController pushViewController:vc animated:YES];
   
        }
     }];
}

//主動調(diào)用flutter方法：
-(void)flutter_actionWithChannleName:(NSString *)channel Name:(NSString *)name
{
    FlutterMethodChannel *notifationChannel = [self flutterMethodChannelWithName:channel];  
    if([name isEqualToString:@"refrish"]){
        NSDictionary *dic =  @{
            @"userId":@"****",
        };
        //通道去調(diào)用flutter方法
        [notifationChannel invokeMethod:name arguments:dic];
    }
}