自定义流量分组

// 设置渠道
[MCAPI sharedInstance].channel = @"channel";
// 设置子渠道
[MCAPI sharedInstance].subChannel = @"subChannel";

// 用户ID
[MCAPI sharedInstance].userID = @"userID";

// 自定义规则
[MCAPI sharedInstance].customData = @{
    kMCCustomDataUserIDKey:@"test_custom_user_id"
};