融云 SDK 如何实现群组操作

背景

在集成融云 SDK 后，需要实现群组操作的消息通知。包括：

• 群创建、销毁通知
• 群公告通知
• 群人员加入、退出通知
• 群昵称修改通知
• ...

融云现有的 SDK 仅提供了 RCGroupNotificationMessage，内部封装了几种简单的类型操作，且扩展性不强，无法完成现有的操作。

解决方案：

使用自定义消息重新来构建群组通知消息。

参考 sealtlak 中的 RCDGroupNotificationMessage，也是单独对群组操作内容，重新进行了封装处理。

/*!
 群组通知消息
 */
@interface RCDGroupNotificationMessage : RCMessageContent

//操作名
@property (nonatomic, copy) NSString *operation;

//操作人
@property (nonatomic, copy) NSString *operatorUserId;

//操作对象
@property (nonatomic, strong) NSArray<NSString *> *targetUserIds;

//内容
@property (nonatomic, copy) NSString *message;

//获取摘要
- (NSString *)getDigest:(NSString *)groupId;
@end

这个类预定义了下面几种操作类型消息,具体内容可参考名字定义

extern NSString *const RCDGroupCreate;
extern NSString *const RCDGroupMemberAdd;
extern NSString *const RCDGroupMemberQuit;
extern NSString *const RCDGroupMemberKicked;
extern NSString *const RCDGroupRename;
extern NSString *const RCDGroupBulletin;
extern NSString *const RCDGroupOwnerTransfer;
extern NSString *const RCDGroupDismiss;
extern NSString *const RCDGroupMemberJoin;
extern NSString *const RCDGroupMemberManagerSet;
extern NSString *const RCDGroupMemberManagerRemove;
extern NSString *const RCDGroupMemberProtectionOpen;
extern NSString *const RCDGroupMemberProtectionClose;

.m 的实现还是按照自定义消息的实现进行处理。唯一有区别的是在获取摘要的方法，在这个方法中对消息内容进行了处理，根据操作名的不同，来对显示的内容进行各种适配。此处根据根据自己的业务进行修改。

- (NSString *)getDigest:(NSString *)groupId {

    NSString *content;

    //获取用户信息
    NSString *operationName = [self getDisplayNames:@[ self.operatorUserId?self.operatorUserId:@""] groupId:groupId];
    NSString *targetNames = [self getDisplayNames:self.targetUserIds groupId:groupId];

    //是否当前用户操作
    BOOL isMeOperate = NO;
    if ([self.operatorUserId isEqualToString:[RCIMClient sharedRCIMClient].currentUserInfo.userId]) {
        isMeOperate = YES;
    }

    //判断操作类型
    if ([self.operation isEqualToString:RCDGroupCreate]) {
        content =
            [NSString stringWithFormat:NSLocalizedStringFromTable(isMeOperate ? @"GroupHaveCreated" : @"GroupCreated",
                                                                  @"RongCloudKit", nil),
                                       operationName];
    } else if ([self.operation isEqualToString:RCDGroupMemberAdd]) {
        if (self.targetUserIds.count == 1 && [self.targetUserIds containsObject:self.operatorUserId]) {
            content = [NSString
                stringWithFormat:NSLocalizedStringFromTable(@"GroupJoin", @"RongCloudKit", nil), operationName];
        } else {
            content = [NSString
                stringWithFormat:NSLocalizedStringFromTable(isMeOperate ? @"GroupHaveInvited" : @"GroupInvited",
                                                            @"RongCloudKit", nil),
                                 operationName, targetNames];
        }
    } else if ([self.operation isEqualToString:RCDGroupMemberJoin]) {
        content =
            [NSString stringWithFormat:NSLocalizedStringFromTable(@"GroupJoin", @"RongCloudKit", nil), operationName];
    } else if ([self.operation isEqualToString:RCDGroupMemberQuit]) {
        content = [NSString stringWithFormat:NSLocalizedStringFromTable(isMeOperate ? @"GroupHaveQuit" : @"GroupQuit",
                                                                        @"RongCloudKit", nil),
                                             operationName];
    } else if ([self.operation isEqualToString:RCDGroupMemberKicked]) {
        content =
            [NSString stringWithFormat:NSLocalizedStringFromTable(isMeOperate ? @"GroupHaveRemoved" : @"GroupRemoved",
                                                                  @"RongCloudKit", nil),
                                       operationName, targetNames];
    } else if ([self.operation isEqualToString:RCDGroupRename]) {
        content = [NSString stringWithFormat:NSLocalizedStringFromTable(@"GroupChanged", @"RongCloudKit", nil),
                                             operationName, self.targetGroupName];
    } else if ([self.operation isEqualToString:RCDGroupDismiss]) {
        content =
            [NSString stringWithFormat:NSLocalizedStringFromTable(isMeOperate ? @"GroupHaveDismiss" : @"GroupDismiss",
                                                                  @"RongCloudKit", nil),
                                       operationName];
    } else if ([self.operation isEqualToString:RCDGroupOwnerTransfer]) {
        content = [NSString stringWithFormat:RCDLocalizedString(@"GroupHasNewOwner"), targetNames];
    } else if ([self.operation isEqualToString:RCDGroupMemberManagerSet]) {
        content = [NSString stringWithFormat:RCDLocalizedString(@"GroupSetManagerMessage"), targetNames];
    } else if ([self.operation isEqualToString:RCDGroupMemberProtectionOpen]) {
        content = RCDLocalizedString(@"openMemberProtection");
    } else if ([self.operation isEqualToString:RCDGroupMemberProtectionClose]) {
        content = [NSString stringWithFormat:RCDLocalizedString(@"closeMemberProtection"), operationName];
    } else {
        content = NSLocalizedStringFromTable(@"unknown_message_cell_tip", @"RongCloudKit", nil);
    }
    return content;
}

此外，还有一个获取名称的方法，用来维护用户信息。

- (NSString *)getDisplayNames:(NSArray<NSString *> *)userIds groupId:(NSString *)groupId