在 iOS 上实现通知快捷回复

技术指南 iOS
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前提条件

请先阅读苹果推送文档

解决方案

  1. 引入依赖库

    #import <UserNotifications/UserNotifications.h>

  2. 添加通知快捷按钮

    - (void)addNotificationCategory {
    UNNotificationAction *ignoreAction = [UNNotificationAction actionWithIdentifier:@"ignore"
                                                                              title:@"忽略"
                                                                            options:UNNotificationActionOptionNone];
    UNNotificationAction *replayAction = [UNTextInputNotificationAction actionWithIdentifier:@"reply"
                                                                                       title:@"回复"
                                                                                     options:UNNotificationActionOptionNone
                                                                        textInputButtonTitle:@"发送"
                                                                        textInputPlaceholder:@"请输入回复信息"];
    UNNotificationCategory *category = [UNNotificationCategory categoryWithIdentifier:@"message"
                                                                              actions:@[ignoreAction, replayAction]
                                                                    intentIdentifiers:@[]
                                                                              options:UNNotificationCategoryOptionNone];
    [[UNUserNotificationCenter currentNotificationCenter] setNotificationCategories:[NSSet setWithObject:category]];
}

  3. 监听和处理通知代理

    [UNUserNotificationCenter currentNotificationCenter].delegate = self;
- (void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void (^)(void))completionHandler {
    NSString *categoryIdentifier = response.notification.request.content.categoryIdentifier;
    UNNotificationContent *content = response.notification.request.content;
    if ([categoryIdentifier isEqualToString:@"message"]) {
        if ([response.actionIdentifier isEqualToString:@"reply"]) {
            NSDictionary *userInfo = content.userInfo;
            NSString *userId = [self getUserIdFromRemotePushInfo:userInfo];
            
            UNTextInputNotificationResponse *tResponse = (UNTextInputNotificationResponse *)response;
            NSString *userText = tResponse.userText;
            
            [self replyMessage:userId content:userText completion:^(BOOL success) {
                dispatch_async(dispatch_get_main_queue(), ^{
                    completionHandler();
                });
            }];
            return;
        }
    }
    completionHandler();
}

  4. 获取消息会话用户id，可以参考融云推送 payload

    - (nullable NSString *)getUserIdFromRemotePushInfo:(NSDictionary *)info {
    NSDictionary *rc = info[@"rc"];
    if (![rc isKindOfClass:[NSDictionary class]]) return nil;
    NSString *userId = rc[@"tId"];
    if (![userId isKindOfClass:[NSString class]]) return nil;
    return userId;
}

  5. 回复消息的实现方式有两种，一种是直接用 IM 建立连接后发送；另一种是调用服务器端接口发送。相对来说第二种方式简单安全，第一种实现起来更复杂、易出错。

    客户端方式，以下使用了 IMKit 中的方法：

    - (void)replyMessage:(NSString *)toUserId content:(NSString *)content completion:(void(^)(BOOL))completion {
    NSString *token = [[NSUserDefaults standardUserDefaults] stringForKey:@"IM_Token"];
    if (!token.length || !toUserId || !content) return !completion?:completion(NO);
    [RCIM.sharedRCIM initWithAppKey:AppKey option:nil];
    RCTextMessage *message = [RCTextMessage messageWithContent:content];
    if ([[RCIM sharedRCIM] getConnectionStatus] == ConnectionStatus_Connected) {
        [[RCIM sharedRCIM] sendMessage:ConversationType_PRIVATE targetId:toUserId content:message pushContent:nil pushData:nil success:^(long messageId) {
            !completion?:completion(YES);
        } error:^(RCErrorCode nErrorCode, long messageId) {
            !completion?:completion(NO);
        }];
        return;
    }
    [[RCIM sharedRCIM] connectWithToken:token dbOpened:^(RCDBErrorCode code) {
    } success:^(NSString *userId) {
        [[RCIM sharedRCIM] sendMessage:ConversationType_PRIVATE targetId:toUserId content:message pushContent:nil pushData:nil success:^(long messageId) {
            !completion?:completion(YES);
        } error:^(RCErrorCode nErrorCode, long messageId) {
            !completion?:completion(NO);
        }];
    } error:^(RCConnectErrorCode errorCode) {
        !completion?:completion(NO);
    }];
}

    服务端方式，服务器发送实现请参考文档：

    - (void)replyMessage:(NSString *)toUserId content:(NSString *)content completion:(void(^)(BOOL))completion {
    [network sendMessage:toUserId content:content completion:^(int code){}];
}

  6. 消息发送。为了支持 Category 事件的触发，需要发送消息时配置推送中的 category 属性，安卓和iOS都需要设置

        RCMessage *message = [[RCMessage alloc] initWithType:self.conversationType targetId:self.targetId direction:MessageDirection_SEND content:messageContent];
    message.messagePushConfig.iOSConfig.category = @"message";
    [[RCIM sharedRCIM] sendMessage:message pushContent:nil pushData:nil successBlock:^(RCMessage *successMessage) {
        
    } errorBlock:^(RCErrorCode nErrorCode, RCMessage *errorMessage) {
        
    }];

    注意：Category 事件触发后，只是调用的部分代码，如果在 AppDelegate 中其它地方初始化和连接时，判断下当前 App 的活跃状态：

    if ([[UIApplication sharedApplication] applicationState] == UIApplicationStateActive) {
    [RCIM.sharedRCIM initWithAppKey:AppKey];
}