react-native原生回调的两种方式之IOS

RCT_EXPORT_METHOD(getSSID:(RCTResponseSenderBlock)callback)
{
NSArray *interfaceNames = CFBridgingRelease(CNCopySupportedInterfaces());
NSLog(@"%s: Supported interfaces: %@", __func__, interfaceNames);

NSDictionary *SSIDInfo;
NSString *SSID = @"error";

for (NSString *interfaceName in interfaceNames) {
SSIDInfo = CFBridgingRelease(CNCopyCurrentNetworkInfo((__bridge CFStringRef)interfaceName));

if (SSIDInfo.count > 0) {
SSID = SSIDInfo[@"SSID"];
break;
}
}

callback(@[SSID]);
}

NetworkInfo.getIPAddress(ip => {
localIp = ip;
console.log(ip);
AlertIOS.alert(
'IP地址:' + localIp,
[
{text : '关闭', onPress : () => console.log('123')}
]
)
});

#import "RCTBridge.h"
#import "RCTEventDispatcher.h"
@implementation CalendarManager
@synthesize bridge = _bridge;
- (void)calendarEventReminderReceived:(NSNotification *)notification
{
NSString *eventName = notification.userInfo[@"name"];
[self.bridge.eventDispatcher sendAppEventWithName:@"EventReminder"
body:@{@"name": eventName}];
}
@end

var subscription = DeviceEventEmitter.addListener(
'EventReminder',
(reminder) => console.log(reminder.name));
...
// Don't forget to unsubscribe
subscription.remove();