Flutter 混合开发FlutterBoost iOS 接入流程

现在一般的iOS应用都是用cocopod集成的，一般都有对应的Podfile文件，在对应的Podfile文件末尾处加入以下代码

flutter_application_path = '../flutter_module'
eval(File.read(File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')), binding)
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最好也和Android一样，分开两个工程，iOS工程和flutter功能是平级的，这样互不影响

之后再iOS工程目录下执行 pod install 命令，会在pod下面的Development Pods文件下面看到Flutter 和FlutterPluginRegistrant 两个文件。

如果出现啥错误，记得在工程的BuildSettings 下面检查Enable BitCode是否为NO。

2.2添加编译脚本

"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" build
"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" embed
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在BuildPhases 栏下，点击左上角的加号(+) 选择New Run Script Phase填入以上脚本

之后执行Build 编译，项目应该能运行起来，如果出现执行上面的步骤。

3.混编代码集成

修改AppDelegate.h/m文件

#import <UIKit/UIKit.h>
#import <Flutter/Flutter.h>

@interface AppDelegate : FlutterAppDelegate <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

+ (AppDelegate *)sharedAppDelegate;

@end
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h头文件需要集成FlutterAppDelegate

#import <FlutterPluginRegistrant/GeneratedPluginRegistrant.h>

#import "AppDelegate.h"
#import "AppDelegate+Init.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor whiteColor];
    [self initConfigWithOptions:launchOptions];
    [self.window makeKeyAndVisible];
    [GeneratedPluginRegistrant registerWithRegistry:self];
    return YES;
}
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在AppDelegate.m文件的didFinishLaunchingWithOptions方法中加入插件集成的方法

[GeneratedPluginRegistrant registerWithRegistry:self];
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增加ViewController的业务跳转

#import <Flutter/Flutter.h>
#import "ViewController.h"

@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button addTarget:self
               action:@selector(handleButtonAction)
     forControlEvents:UIControlEventTouchUpInside];
    [button setTitle:@"点我" forState:UIControlStateNormal];
    [button setBackgroundColor:[UIColor redColor]];
    button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
    [self.view addSubview:button];
}

- (void)handleButtonAction {
    FlutterViewController* flutterViewController = [[FlutterViewController alloc] init];
    [self presentViewController:flutterViewController animated:false completion:nil];
}
@end
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这样即可点击跳转到Flutter默认生成的main界面

4.FlutterBoost接入

4.1 Flutter 工程接入FlutterBoost

在对应的pubspec.yaml文件中加入依赖，pubspec.yaml就是一个配置文件

flutter_boost:
        git:
            url: 'https://github.com/alibaba/flutter_boost.git'
            ref: '0.0.411'
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之后调用Package get，右上角即可查看，之后还是在命令行 工具 下在flutte_module 根目下，执行flutter build ios 以及在iOS的根目录下执行pod install 使iOS和flutter都添加FlutterBoost插件。

4.2Flutter中main.dart文件中配置

可以参考前面的Android版本

4.3 iOS工程的修改

4.3.1 添加libc++

需要 将libc++ 加入 "Linked Frameworks and Libraries" 这个主要是项目的General 的Linked Frameworks and Libraries 栏下，点击加号（+）搜索libc++,找到libc++.tbd即可

4.3.2 修改AppDelegate.h/m文件

#import <UIKit/UIKit.h>
#import <flutter_boost/FlutterBoost.h>

@interface AppDelegate : FLBFlutterAppDelegate <UIApplicationDelegate, XGPushDelegate>
@property (strong, nonatomic) UIWindow *window;

+ (AppDelegate *)sharedAppDelegate;

@end

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需要继承FLBFlutterAppDelegate ，而对应的.m文件可保持不变或者去掉

[GeneratedPluginRegistrant registerWithRegistry:self];
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都可以

4.3.3 实现FLBPlatform协议

应用程序实现FLBPlatform协议方法，可以使用官方demo中的DemoRouter

@interface DemoRouter : NSObject<FLBPlatform>

@property (nonatomic,strong) UINavigationController *navigationController;

+ (DemoRouter *)sharedRouter;

@end


@implementation DemoRouter

- (void)openPage:(NSString *)name
          params:(NSDictionary *)params
        animated:(BOOL)animated
      completion:(void (^)(BOOL))completion
{
    if([params[@"present"] boolValue]){
        FLBFlutterViewContainer *vc = FLBFlutterViewContainer.new;
        [vc setName:name params:params];
        [self.navigationController presentViewController:vc animated:animated completion:^{}];
    }else{
        FLBFlutterViewContainer *vc = FLBFlutterViewContainer.new;
        [vc setName:name params:params];
        [self.navigationController pushViewController:vc animated:animated];
    }
}


- (void)closePage:(NSString *)uid animated:(BOOL)animated params:(NSDictionary *)params completion:(void (^)(BOOL))completion
{
    FLBFlutterViewContainer *vc = (id)self.navigationController.presentedViewController;
    if([vc isKindOfClass:FLBFlutterViewContainer.class] && [vc.uniqueIDString isEqual: uid]){
        [vc dismissViewControllerAnimated:animated completion:^{}];
    }else{
        [self.navigationController popViewControllerAnimated:animated];
    }
}

@end
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也可以自己根据此修改。其中的openPage 方法会接收来至flutter-->native以及native-->flutter的页面跳转，可以根据用户自由的书写

4.3.5 初始化FlutterBoost

[FlutterBoostPlugin.sharedInstance startFlutterWithPlatform：router
                                                        onStart：^（FlutterViewController * fvc）{
                                                            
                                                        }];
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官方demo是在AppDelegate中初始化的，可以修改FLBPlatform协议实现类完成对应的操作对应的初始化做

5.页面跳转

Native-->Flutter

FLBFlutterViewContainer *vc = FLBFlutterViewContainer.new;
        [vc setName:name params:params];
        [self.navigationController presentViewController:vc animated:animated completion:^{}];
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Flutter-->Native

FlutterBoost.singleton.openPage("pagename", {}, true);
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最终都会跳转到FLBPlatform 协议实现类的openPage 方法中，很多操作都是在FLBPlatform协议实现类中，包括页面跳转，关闭，以及对应的一些Flutter 和Native通信相关的。