我一生无法获得一个事件,该事件可以从iOS本机正确地跨网桥发送到react本机JS上下文。在Objective-C方面,我希望有一个模块可以轻松地通过桥发送事件。我将此类称为EventEmitter,其定义如下:
// EventEmitter.h
#import "RCTBridge.h"
#import "RCTEventDispatcher.h"
@interface EventEmitter : NSObject<RCTBridgeModule>
- (void)emitEvent:(NSString *) eventName withData:(id) eventData;
@end
和实现:
// EventEmitter.m
#import "EventEmitter.h"
@implementation EventEmitter
RCT_EXPORT_MODULE();
@synthesize bridge = _bridge;
- (void)emitEvent:(NSString *) eventName withData:(id) eventData
{
NSLog( @"emitting %@ with data %@", eventName, [eventData description] );
[[_bridge eventDispatcher] sendDeviceEventWithName:eventName body:eventData];
[[_bridge eventDispatcher] sendAppEventWithName:eventName body:eventData];
}
@end
我同时使用sendDeviceEvent和sendAppEvent,因为两者都无法正常工作。
在JS方面,我注册为在我的模块之一的全局名称空间中接收这些事件(以便我知道事件订阅将在事件发出之前发生)。我这样注册:
console.log( 'ADDING EVENT LISTENERS' );
NativeAppEventEmitter.addListener( 'blah', test => console.log( 'TEST1', test ) );
DeviceEventEmitter.addListener( 'blah', test => console.log( 'TEST2', test ) );
在我的日志语句中,得到以下信息:
2016-03-19 12:26:42.501 [trace][tid:com.facebook.React.JavaScript] ADDING EVENT LISTENERS
2016-03-19 12:26:43.613 [name redacted][348:38737] emitting blah with data [data redacted]
因此,我可以告诉我同时发送了带有标签blah的应用程序事件和设备事件,并且我已注册使用DeviceEventEmitter和NativeAppEventEmitters监听blah事件,但没有在监听器中被调用。
我究竟做错了什么??谢谢阅读!
我已经尝试调度事件,但是bridge
当您EventEmitter
使用手动创建新实例时,似乎未初始化[EventEmitter alloc] init]
您应该让react-native创建实例。我检查了本机组件,它们正在使用-(void)setBridge:(RCTBridge *)bridge
方法进行初始化工作。请查看RCTLinkingManager
示例。它NSNotificationCenter
用于处理事件。
// registering for RCTOpenURLNotification evet when the module is initialised with a bridge
- (void)setBridge:(RCTBridge *)bridge
{
_bridge = bridge;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(handleOpenURLNotification:)
name:RCTOpenURLNotification
object:nil];
}
// emitting openURL event to javascript
- (void)handleOpenURLNotification:(NSNotification *)notification
{
[_bridge.eventDispatcher sendDeviceEventWithName:@"openURL"
body:notification.userInfo];
}
// creating RCTOpenURLNotification event to invoke handleOpenURLNotification method
+ (BOOL)application:(UIApplication *)application
openURL:(NSURL *)URL
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation
{
NSDictionary<NSString *, id> *payload = @{@"url": URL.absoluteString};
[[NSNotificationCenter defaultCenter] postNotificationName:RCTOpenURLNotification
object:self
userInfo:payload];
return YES;
}
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