如果您的 iPhone 空间不足，您一定已经进入“设置”菜单以查找占用如此多空间的内容。如果这样做，您可能会看到“系统数据(System Data)”部分。那到底是什么？简单：存储 iOS 以及 iPhone 运行所需的其他必要信息的地方。
有时，这些数据会占用大量空间，超出其应有的空间。好消息是有一些方法可以减少系统存储空间。以下是清除 iPhone 系统数据的方法。
重启你的 iPhone
理解为什么系统数据(System Data)占用如此多空间的关键是它包含临时文件，如应用程序缓存、活动日志和其他系统文件。重新启动 iPhone 可以清除其中的许多罪魁祸首。
更新您的手机
如果您的手机正在进行重大软件更新，可能会增加使用的系统数据量。处理此问题的最简单方法是将手机更新到最新版本。特别是 iOS 13 存在一个问题，系统数据会急剧增加，直到后来的补丁解决了这个问题。
如果您最近下载了 iPhone 更新但尚未安装，则该更新存储在系统数据中，通常可以达到数十 GB。
清除单个应用程序缓存
Apple不喜欢人们在他们的设备内部乱搞，这意味着不可能清除整个应用程序缓存。但是，您有时可以清除单个应用程序的缓存。对于Spotify 等(like Spotify.)基于音乐和音频的应用程序尤其如此。因此，如果您听音乐或播客，您应该经常清除应用程序缓存。
- 打开Spotify并选择右上角的齿轮。
- 选择存储。
- 选择清除缓存。
- 再次
选择清除缓存进行确认。(Clear)
您不会丢失任何下载的内容，但会减少该特定应用程序使用的系统数据量。请注意，这样做会删除数据，例如您是否已完成播客或部分完成的剧集。
清除网站数据
另一种释放 iPhone 存储空间的方法是定期清除缓存数据。例如，您的浏览历史是您系统数据的一部分。因此，您可以清除 Safari(clear Safari)、Chrome和其他浏览器的数据以释放空间。与清除单个应用程序缓存一样，您也可以清除Safari缓存以打开更多空间。
- 打开设置应用 > Safari。
- 向下滚动(Scroll)并选择清除历史记录(Clear History)和网站数据(Website Data)。
- 从弹出窗口中
选择清除历史记录(Clear History)和数据。(Data)
请记住，这将使您退出网站并强制您重新登录。
更改保留消息的时间
Messages应用程序（以前称为 iMessage）在存储设置中有自己的空间，但其中一些内存也分配给系统存储，尤其是您的 Message 历史记录。因此，更改手机保留旧消息的时间可以清理空间。如果您想为子孙后代保留这些消息，请将它们上传到 iCloud。
- 打开设置 > 消息。
- 选择消息历史记录。
- 将时间长度从永远(Forever)更改为 30 天。
- 选择删除(Select Delete)以删除所有超过 30 天的消息。
这不会产生巨大影响，但会释放 iPhone 系统数据的额外空间。
注销邮件并重新登录
缓存的目的是使标准的日常操作更快。例如，如果您在 iPhone 上打开通过电子邮件发送的文档，它会保存该文档的缓存版本，以便您下次选择它时加载速度更快。虽然方便，但这些文件加起来。
清除此缓存的一种简单方法是退出您的电子邮件帐户并重新登录。这是释放一些空间的快速简便方法，但请注意：如果您有很多电子邮件，则需要当您的手机尝试重新下载它们时，请
确保您处于Wi-Fi状态。(Wi-Fi)
删除应用程序
另一个简单易行的解决方案是从手机中删除应用程序并重新安装。(delete apps)如果您不想完全删除应用程序，您可以随时卸载它们。删除应用程序后，只需重新下载即可。这将清除您无法手动清除的任何应用程序的缓存，并从数据存储中释放相当多的空间，不仅是从您的系统数据中，而且是从整体上。如果您有任何未使用的应用程序，请务必经常清除它们。
核选项：恢复(Nuclear)出厂设置
如果手动完成所有操作听起来太乏味，还有一种更简单的方法：将手机恢复出厂设置。当然，您始终可以先备份手机，但有时这只会忽略问题。
- 打开Settings > General > Transfer或重置(Reset)iPhone。
- 选择清除所有内容(Erase All Content)和设置(Settings)。
按照屏幕上的步骤彻底擦除您的手机并将其恢复到首次购买时的状态。记住(Remember)，这是核选项；一旦你把手机擦干净，就再也回不来了。但是，它会将您的系统数据减少到更合理的水平。
如果您的 iOS 设备充满了随机数据，您需要释放一些空间（也许是为了最新的热门手机游戏），这些步骤可以提供帮助。它们也适用于 iPad，您还可以在使用时清除iOS 上的其他存储空间(storage hogs on iOS)——例如您不再需要的旧照片和视频。
How to Reduce “System Data” Storage Usage on iPhone
If you’ve run out of space on yoυr iPhone, you mυst have dυg into yoυr Settings menu to loоk for what’s taking up so much ѕpacе. If you did, you probably saw the System Data section. So what is it, еxactly? Easy: a placе where iOS is stored, along with other necessary information the iPhone needs to run.
Sometimes this data takes up a lot of space, more than it seems like it should. The good news is that there are ways to reduce the system storage space. Here’s how to clear system data from your iPhone.
Restart Your iPhone
The key to understanding why System Data takes up so much space is that it contains temporary files like the app cache, activity logs, and other system files. Restarting your iPhone clears many of these culprits.
Update Your Phone
If your phone is sitting on a major software update, it can increase the amount of system data used. The easiest way to take care of this is to update your phone to the latest version. iOS 13, in particular, had an issue where the system data would increase dramatically until a later patch corrected the problem.
If you have recently downloaded an iPhone update but have yet to install it, that update is stored in system data and can often measure in the dozens of gigabytes.
Clear Individual App Caches
Apple doesn’t like people mucking about inside their devices, meaning it’s impossible to clear the entire app cache. However, you can sometimes clear the cache off individual apps. This is especially true for music and audio-based apps like Spotify. So if you listen to music or podcasts, you should clear the app cache every so often.
- Open Spotify and select the gear in the top-right corner.
- Select Storage.
- Select Clear cache.
- Select Clear cache once more to confirm.
You won’t lose any downloaded content, but it will reduce the amount of system data used by that particular app. Note that doing this will remove data like whether you’ve completed a podcast or partially finished episodes.
Clear Website Data
Another way to free up a bit of iPhone storage is to clear your cached data regularly. For example, your browsing history is part of your system data. So you can clear Safari, Chrome, and other browsers’ data to free up space. Like clearing individual app caches, you can also clear your Safari cache to open up more space.
- Open the Settings app > Safari.
- Scroll down and select Clear History and Website Data.
- Select Clear History and Data from the pop-up.
Remember that this will log you out of websites and force you to log in again.
Change How Long You Keep Messages
The Messages app (formerly iMessage) has its own space in the storage settings, but some of that memory is also allocated to system storage, particularly your Message history. As a result, changing the time your phone holds onto old messages can clear up space. If you want to hold onto those messages for posterity, upload them to iCloud.
- Open Settings > Messages.
- Select Message History.
- Change the length of time from Forever to 30 Days.
- Select Delete to remove all messages that are older than 30 days.
This won’t have a tremendous impact but will free up additional space from your iPhone system data.
Log Out of Mail And Sign Back In
The purpose of a cache is to make standard, day-to-day operations faster. For example, if you open a document on your iPhone sent through an email, it will save a cached version of that document so it will load more quickly when you next select it. While convenient, these documents add up.
An easy way to wipe out this cache is to sign out of your email account and log back in. It’s a quick and easy way to free up some space, but be warned: if you have a lot of emails, you’ll want to make sure you’re on Wi-Fi when your phone attempts to re-download them all.
Delete Apps
Another simple, easy solution is to delete apps from your phone and reinstall them. You can always offload apps if you don’t want to delete them completely. Once the apps have been removed, just re-download them. This will clear the cache of any apps you can’t clear manually and free up quite a bit of space from data storage, not only from your system data but also overall. If you have any unused apps, make it a point to clear them out every so often.
The Nuclear Option: Factory Reset Your Phone
If doing everything by hand sounds too tedious, there’s an easier way: factory reset your phone. Of course, you can always back up your phone first, but sometimes this just passes the problem off.
- Open Settings > General > Transfer or Reset iPhone.
- Select Erase All Content and Settings.
Follow the on-screen steps to completely wipe your phone and restore it to how it was when you first purchased it. Remember, this is the nuclear option; once you wipe your phone clean, there’s no coming back. However, it will reduce your system data to a much more reasonable level.
If your iOS device is too full of random data and you need to free up some space (perhaps for the latest hit mobile game), these steps can help. They also work for iPads, and you can also clear out other storage hogs on iOS while you’re at it — like old photos and videos you no longer need.
