React Native 02：原生容器类封装

RN中的JS部分的页面组件最终是在原生这边生成一个RCTRootView类的实例，且RN是在view层做的页面生命周期管理。好像不适合以单页面的形式接入到项目中，所以RN能不能像WebView那样的方式来使用？组件渲染有delegate回调给native？并且可以通过url来请求对应RN页面资源文件并且加载RN页面？能不能提供自动重新渲染页面的方法给原生调用？....

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实现思路

1.继承RCTRootView

2.数据通信

• 1.容器–>RN（RN页面要用的参数:如请求参数，埋点，自定义等等）
  • 初始化RN页面
    容器内部初始化RN页面的时候允许传一个字典类型的自定义参数，它会在组件里根据key-value生成一些默认的props。RN也就可以通过this.props[key]这种形式获取。

// iOS
IMYRNView *rootView = [[IMYRNView alloc] initWithModuleName:@"index.ios" bundleName:@"TestPage" initialProperties:@{@"arg":@"参数"} componentDelegate:self];
// RN
componentDidMount(){
       alert('arg'+this.props.arg);
}

• 容器刷新RN页面方法

 // iOS
  - (void)reloadPage {
[self reloadPageWithProperties:nil];
}
  - (void)reloadPageWithProperties:(NSDictionary *)params {
[self.bridge.eventDispatcher sendAppEventWithName:@"reloadPageEvent"
                                             body:params];
}
//RN
componentDidMount(){
      RNView.bridge_componentDidMount(){
          /*
            基础组件需要实现
            Native手动刷新RN页面，监听事件名称，实现函数
          */
          DeviceEventEmitter.addListener('bridge_reloadPage',this.reloadPage.bind(this));
      }
}
reloadPage(args) {
      alert(args.arg1);
}

• 2.RN->容器（桥接）
• 3.RN->RN（RN->容器->RN)
• 4.容器–>容器（直接传就行）

3.容器需要监听RN组件生命周期事件

// iOS
#pragma mark - RN生命周期回调
RCT_EXPORT_METHOD(bridge_componentWillMount)
{

    [NSObject imy_asyncMainBlock:^{
        IMYRNView *view = (IMYRNView *)[[UIViewController imy_currentViewControlloer] view];
        if ([view.componentDelegate respondsToSelector:@selector(componentWillMount:)]) {
            [view.componentDelegate componentWillMount:view];
        }
    }];
}
RCT_EXPORT_METHOD(bridge_componentDidMount)
{
    [NSObject imy_asyncMainBlock:^{
        IMYRNView *view = (IMYRNView *)[[UIViewController imy_currentViewControlloer] view];
        if ([view.componentDelegate respondsToSelector:@selector(componentDidMount:)]) {
            [view.componentDelegate componentDidMount:view];
        }
    }];
}
// RN
componentDidMount(){
    RNView.bridge_componentDidMount(){
    }
}

---

代码

IMYRNView.h

#import "RCTRootView.h"
#import "RCTBridgeModule.h"
#import "RCTLog.h"

@protocol RNViewComponentDelegate <NSObject>

@optional
- (void)componentWillMount:(RCTRootView *)rootView;
- (void)componentDidMount:(RCTRootView *)rootView;

- (void)rootView:(RCTRootView *)rootView componentWillReceiveProps:(id)nextProps;
- (BOOL)rootView:(RCTRootView *)rootView shouldComponentUpdateNextProps:(id)nextProps nextState:(id)nextState;
- (void)rootView:(RCTRootView *)rootView componentWillUpdateNextProps:(id)nextProps nextState:(id)nextState;
- (void)rootView:(RCTRootView *)rootView componentDidUpdateNextProps:(id)nextProps nextState:(id)nextState;
- (void)componentWillUnmount:(RCTRootView *)rootView;
@end

@interface IMYRNView : RCTRootView<RCTBridgeModule>


- (instancetype)initWithModuleName:(NSString *)moduleName;

- (instancetype)initWithModuleName:(NSString *)moduleName bundleName:(NSString *)bundleName;

- (instancetype)initWithModuleName:(NSString *)moduleName bundleName:(NSString *)bundleName initialProperties:(NSDictionary *)params;

- (instancetype)initWithModuleName:(NSString *)moduleName bundleName:(NSString *)bundleName initialProperties:(NSDictionary *)params componentDelegate:(id<RNViewComponentDelegate>)componentDelegate;

@property(nonatomic,weak) id<RNViewComponentDelegate> componentDelegate;

///刷新
- (void)reloadPage;
- (void)reloadPageWithProperties:(NSDictionary *)params;

@end

IMYRNViewController.h

#import <IMYPublic.h>

@class IMYRNView;
@interface IMYRNViewController : IMYPublicBaseViewController

@property(nonatomic,copy)NSString *navTitle;
@property(nonatomic,copy)NSString *bundleName;
@property(nonatomic,copy)NSString *moduleName;
@property(nonatomic,strong)NSDictionary *initialProperties;/**< RN要用的参数:请求参数，埋点，自定义... */
@property(nonatomic,assign)BOOL isNeedReloadPage;
@property(nonatomic,strong,readonly)IMYRNView *rnView;


@end