Reactnative可以調用原生模塊，原生模塊也可以給JavaScript發送事件通知.最好的方法是繼承RCTEventEmitter.自定義繼承自PushEventEmitter的子類RCTEventEmitter.
#import <Foundation/Foundation.h> #import <React/RCTBridgeModule.h> #import <React/RCTEventEmitter.h> @interface PushEventEmitter : RCTEventEmitter <RCTBridgeModule> - (void)addEventReminderReceived:(NSNotification *)notification; @end
實現supportedEvents方法
#import "PushEventEmitter.h"
@implementation PushEventEmitter
+ (id)allocWithZone:(NSZone *)zone {
static PushEventEmitter *sharedInstance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedInstance = [super allocWithZone:zone];
});
return sharedInstance;
}
RCT_EXPORT_MODULE();
- (NSArray<NSString *> *)supportedEvents
{
return @[@"EventReminder"];
}
- (void)addEventReminderReceived:(NSNotification *)notification {
[self sendEventWithName:@"EventReminder" body:@{@"name": @"FlyElephant"}];
}
@end
React native 設置:
import {
NativeModules,
NativeEventEmitter,
} from 'react-native';
const PushEventEmitter = NativeModules.PushEventEmitter;
const emitterManager = new NativeEventEmitter(PushEventEmitter);
訂閱通知和移除通知:
componentDidMount() {
subscription = emitterManager.addListener(
'EventReminder',
(reminder) => console.log('JavaScript接收到通知:'+reminder.name)
);
}
componentWillUnmount(){
subscription.remove();// 移除通知
}
調用測試:
PushEventEmitter *eventEmitter = [PushEventEmitter allocWithZone:nil];
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