iOS App无法获取开放标签中的extinfo数据？

- (void)onReq:(BaseReq*)req {
    if ([req isKindOfClass:[LaunchFromWXReq class]])
    {
        LaunchFromWXReq *launchFormWxReq = (LaunchFromWXReq*)req;
        NSString *extinfo = launchFormWxReq.message.messageExt;
        NSData *data = [extinfo dataUsingEncoding:NSUTF8StringEncoding];
        if (data) {
        }
    }
}
launchFormWxReq.message为空，无法获取到h5传过来的参数

WXLogLevelDetail的日志为： 
wxlog:clear property list
wxlog:command:2040