Question

我的代码：

在didFinishLaunchingWithOptions中：

//Parse Remote Push Notification setup
let userNotificationTypes = (UIUserNotificationType.Alert |
    UIUserNotificationType.Badge |
    UIUserNotificationType.Sound);

let settings = UIUserNotificationSettings(forTypes: userNotificationTypes, categories: nil)
application.registerUserNotificationSettings(settings)
application.registerForRemoteNotifications()

设置初始频道的功能：

//Parse push remote necessary functions 
func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
let installation = PFInstallation.currentInstallation()
installation.setDeviceTokenFromData(deviceToken)
installation.addUniqueObject("riders" forKey: "channels")
installation.save()
}

我在此行收到错误消息：

installation.addUniqueObject("riders" forKey: "channels")

错误：预期的分隔符

我看到另一个堆栈问题说我应该先检查nil：

Unable to save channels to PFInstallation (iOS)

可是：

（1）答案是在Objective-C中，我不知道如何将其转换为Swift：

if (currentInstallation.channels == nil)
{
    currentInstallation.channels = [[NSArray alloc] init];
}

（2）我想知道这是否是我唯一需要做的事情，或者这是否是这个问题的最佳解决方案？显然它是一个已知的Parse SDK错误。

Answer 1

不，你正在做的一切正确，你只是有一个错字。由于错误显示已经说它需要一个分隔符。通常这个错误会产生误导，但在您的情况下，它会直接导致您的问题：只需在参数之间添加,：

来自：

installation.addUniqueObject("riders" forKey: "channels")

要：

installation.addUniqueObject("riders", forKey: "channels")

Answer 2

添加频道：

currentInstallation.addUniqueObject("channel-name", forKey:"channels")
currentInstallation.saveInBackground()

删除频道：

currentInstallation.removeObject("channel-name", forKey:"channels")
currentInstallation.saveInBackground()

获取当前频道：

if let channels: [String] = currentInstallation.channels as? [String] {
  // Process list of channels. 
}

当然，要获得当前的安装：

let currentInstallation: PFInstallation = PFInstallation.currentInstallation()

参见下面的示例用法：

import Foundation
import Parse

class DWWatchlistController {

  private let currentInstallation: PFInstallation
  private let stocks:[SNStock]
  private(set) var watchlist:[SNStock]

  init(stocks:[SNStock]) {
    self.stocks = stocks
    self.currentInstallation = PFInstallation.currentInstallation()
    self.watchlist = []
    updateWatchlist()
  }

  func addStock(stock: SNStock) {
    currentInstallation.addUniqueObject(stock.ticker, forKey:"channels")
    currentInstallation.saveInBackground()
    updateWatchlist()
  }

  func removeStock(stock: SNStock) {
    currentInstallation.removeObject(stock.ticker, forKey:"channels")
    currentInstallation.saveInBackground()
    updateWatchlist()
  }

  private func updateWatchlist() {
    watchlist = fetchSubscribedStocks()
  }

  private func fetchSubscribedStocks() -> [SNStock] {
    if let channels: [String] = currentInstallation.channels as? [String] {
      return stocks.filter({ (stock: SNStock) -> Bool in
        return contains(channels, stock.ticker as String)
      })
    }
    return []
  }
}

addUniqueObject属性导致xcode中的编译器错误

2 个答案: