如何从亚马逊SNS主题取消订阅iOS设备？
我正在使用Amazon Web Services的Simple Notification Service（SNS）开发iOS应用程序。 此时，应用程序将设备注册到主题，并可以接收发布到主题的推送通知。 可以将设备订阅到许多主题。
现在我试图从特定主题取消订阅设备，但SNSUnsubscribeRequest需要一个SubscriptionARN。 我尝试使用设备上的EndpointARN，但似乎我必须为EndpointARN和TopicARN的组合使用额外的SubscriptionARN。 我如何获得这个ARN？
在这篇文章中：你如何获得订阅的阿恩？ 他们要求整个订户列表，并将每个EndpointARN与设备的EndpointARN进行比较。 这不能是我认为正确的方式。
订阅主题
// Check if endpoint exist
if (endpointARN == nil) {
dispatch_async(dispatch_get_main_queue(), ^{
[[self universalAlertsWithTitle:@"endpointARN not found!" andMessage:@"Please create an endpoint for this device before subscribe to topic"] show];
});
return NO;
}
// Create topic if not exist
NSString *topicARN = [self findTopicARNFor:topic];
if (!topicARN) {
[self createTopic:topic];
topicARN = [self findTopicARNFor:topic];
}
// Subscribe to topic if exist
if (topicARN) {
SNSSubscribeRequest *subscribeRequest = [[SNSSubscribeRequest alloc] initWithTopicArn:topicARN andProtocol:@"application" andEndpoint:endpointARN];
SNSSubscribeResponse *subscribeResponse = [snsClient subscribe:subscribeRequest];
if (subscribeResponse.error != nil) {
NSLog(@"Error: %@", subscribeResponse.error);
dispatch_async(dispatch_get_main_queue(), ^{
[[self universalAlertsWithTitle:@"Subscription Error" andMessage:subscribeResponse.error.userInfo.description] show];
});
return NO;
}
}
return YES;
findTopicARNForTopic方法已遍历主题列表并将后缀与主题名称进行比较。 我真的不知道这是否是最佳做法。
取消订阅主题
NSString *topicARN = [self findTopicARNFor:topic];
if (topicARN) {
SNSUnsubscribeRequest *unsubscribeRequest = [[SNSUnsubscribeRequest alloc] initWithSubscriptionArn:topicARN];
SNSUnsubscribeResponse *unsubscribeResponse = [snsClient unsubscribe:unsubscribeRequest];
if (unsubscribeResponse.error) {
NSLog(@"Error: %@", unsubscribeResponse.error);
}
}
现在我要求整个用户列表，并将EndpointARN与设备的EndpointARN进行比较。 通过以下方法，我获得订阅arn：
- (NSString *)findSubscriptionARNForTopicARN:(NSString *)topicARN
{
// Iterate over each subscription arn list for a topic arn
NSString *nextToken = nil;
do {
SNSListSubscriptionsByTopicRequest *listSubscriptionRequest = [[SNSListSubscriptionsByTopicRequest alloc] initWithTopicArn:topicARN];
SNSListSubscriptionsByTopicResponse *response = [snsClient listSubscriptionsByTopic:listSubscriptionRequest];
if (response.error) {
NSLog(@"Error: %@", response.error);
return nil;
}
// Compare endpoint arn of subscription arn with endpoint arn of this device
for (SNSSubscription *subscription in response.subscriptions) {
if ([subscription.endpoint isEqualToString:endpointARN]) {
return subscription.subscriptionArn;
}
}
nextToken = response.nextToken;
} while (nextToken != nil);
return nil;
}
并通过这种方法从主题中删除设备：
- (void)unsubscribeDeviceFromTopic:(NSString *)topic
{
NSString *subscriptionARN = [self findSubscriptionARNForTopic:topic];
if (subscriptionARN) {
SNSUnsubscribeRequest *unsubscribeRequest = [[SNSUnsubscribeRequest alloc] initWithSubscriptionArn:subscriptionARN];
SNSUnsubscribeResponse *unsubscribeResponse = [snsClient unsubscribe:unsubscribeRequest];
if (unsubscribeResponse.error) {
NSLog(@"Error: %@", unsubscribeResponse.error);
}
}
}
您也可以将SubscriptionArn存储在SubscribeResponse中，并在UnSubscribeRequest中使用此值。
链接地址: http://www.djcxy.com/p/32207.html上一篇: How to unsubscribe an iOS Device from an amazon SNS topic?