Question

我是xcode，swift和realm的新手。我必须为我的毕业设计建立一个IOS应用程序。我有一个如何处理多个客户端请求的问题。我的应用程序假设从多个用户获取请求，我必须在服务器中处理这些请求（启动计数器，计时器，或添加，删除，更新等），我的服务器正在使用领域数据库。我的问题是如何在本地客户端和服务器之间进行通信？我可以使用swift而不是javascript实现服务器吗？

Answer 1

如果您正在使用Realm Mobile Platform进行客户端与服务器的交互，则应该能够使用Realm Object Server的事件处理功能来检测和响应用户触发的请求。您可以download a trial of the Professional Edition（这应该足以满足您作为私人项目的需求。）

注册事件处理程序的代码如下所示（取自the Realm docs页面）

var Realm = require('realm');

// Insert the Realm admin token here
//   Linux:  cat /etc/realm/admin_token.base64
//   macOS:  cat realm-object-server/admin_token.base64
var ADMIN_TOKEN = 'ADMIN_TOKEN';

// the URL to the Realm Object Server
var SERVER_URL = 'realm://127.0.0.1:9080';

// The regular expression you provide restricts the observed Realm files to only the subset you
// are actually interested in. This is done in a separate step to avoid the cost
// of computing the fine-grained change set if it's not necessary.
var NOTIFIER_PATH = '/^\/([0-9a-f]+)\/private$/';

// The handleChange callback is called for every observed Realm file whenever it
// has changes. It is called with a change event which contains the path, the Realm,
// a version of the Realm from before the change, and indexes indication all objects
// which were added, deleted, or modified in this change
function handleChange(changeEvent) {
  // Extract the user ID from the virtual path, assuming that we're using
  // a filter which only subscribes us to updates of user-scoped Realms.
  var matches = changeEvent.path.match(/^\/([0-9a-f]+)\/private$/);
  var userId = matches[1];

  var realm = changeEvent.realm;
  var coupons = realm.objects('Coupon');
  var couponIndexes = changeEvent.changes.Coupon.insertions;

  for (var couponIndex in couponIndexes) {
    var coupon = coupons[couponIndex];
    if (coupon.isValid !== undefined) {
      var isValid = verifyCouponForUser(coupon, userId);
      // Attention: Writes here will trigger a subsequent notification.
      // Take care that this doesn't cause infinite changes!
      realm.write(function() {
        coupon.isValid = isValid;
      });
    }
  }
}

// create the admin user
var adminUser = Realm.Sync.User.adminUser(adminToken);

// register the event handler callback
Realm.Sync.addListener(SERVER_URL, adminUser, NOTIFIER_PATH, 'change', handleChange);

console.log('Listening for Realm changes');

不幸的是，此时服务器上的Realm和Swift都不支持（除非它是Mac服务器），因为Realm Swift需要Objective-C运行时才能工作，而且不是这样。在非Mac平台上可用。 Node.js是要走的路。：）

使用带有swift xcode的域的客户端 - 服务器方法

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