No, there is no cost. The only "gotchas" are that your app has to be in the app store(i.e. no jailbroken apps), and you have to maintain a server for pushing the events.
如果您正在构建自己的推送服务器（如上所述），则会产生托管费用以及设置和管理它的时间成本。或者，您可以使用 iLime (www.ilime.com) 等服务，它提供 RESTful API 和预先提供大量免费推送警报来为您处理服务器基础设施。
披露：我在 KeyLimeTie 工作，该公司生产 iLime - 如果您有任何问题，请告诉我。
衷心祝愿将 APNS 集成到您的应用程序中，无论您选择如何这样做。
蒂姆
If you are building you own push server, which you mention above, there are hosting expenses and the cost of time to set up and administer it. Alternatively, you can use a service like iLime (www.ilime.com), which provides a RESTful API and a lot of free push alerts up-front to handle the server infrastructure for you.
Disclosure: I work for KeyLimeTie, who produces iLime - let me know if you have any questions.
Best wishes integrating APNS into your app, however you choose to do so.
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不，没有任何费用。唯一的“问题”是您的应用程序必须位于应用程序商店中（即没有越狱的应用程序），并且您必须维护一个服务器来推送事件。
No, there is no cost. The only "gotchas" are that your app has to be in the app store(i.e. no jailbroken apps), and you have to maintain a server for pushing the events.
如果您正在构建自己的推送服务器（如上所述），则会产生托管费用以及设置和管理它的时间成本。或者，您可以使用 iLime (www.ilime.com) 等服务，它提供 RESTful API 和预先提供大量免费推送警报来为您处理服务器基础设施。
披露：我在 KeyLimeTie 工作，该公司生产 iLime - 如果您有任何问题，请告诉我。
衷心祝愿将 APNS 集成到您的应用程序中，无论您选择如何这样做。
蒂姆
If you are building you own push server, which you mention above, there are hosting expenses and the cost of time to set up and administer it. Alternatively, you can use a service like iLime (www.ilime.com), which provides a RESTful API and a lot of free push alerts up-front to handle the server infrastructure for you.
Disclosure: I work for KeyLimeTie, who produces iLime - let me know if you have any questions.
Best wishes integrating APNS into your app, however you choose to do so.
Tim