默认情况下，无论您是否在设备上设置了 Touch ID 或密码，iPhone 都会在您的锁定屏幕上向全世界展示您的(lock screen)SMS 文本和 iMessage 。(SMS texts and iMessages)对于大多数人来说，这没什么大不了的，因此他们不会更改(t change)设置。
但是，它实际上可能是一个很大的隐私或安全问题。一方面，你永远不知道你会收到什么样的文本以及谁可能碰巧看到它。使用默认设置，任何在您手机视线范围内的人都可以在消息到达时阅读消息，因为您的手机会亮起。
如果他们可以物理触摸手机，他们不仅可以阅读消息，还可以在锁定屏幕上(lock screen)实际回复消息。即使您启用了 Touch ID 或密码也是如此。
从安全角度来看(security perspective)，对于在网站上启用了双因素身份验证(two-factor authentication)的人来说，这可能是危险的。许多网站只是通过短信向您发送代码，然后您附近的任何人都可以轻松查看该代码。
值得庆幸的是，Apple在设置中包含了许多不同的选项来控制您的隐私。在本文中，我将向您展示如何保护您的短信，以便只有您可以看到它们。
请注意，如果您不启用 Touch ID 或启用密码，以下这些设置均无济于事。即使您将手机配置为在锁定屏幕(lock screen)上不显示任何内容，其他人也可以轻松滑动以解锁您的手机并阅读他们想要的任何内容。
显示预览
您可以更改的第一个设置是Show Previews，这对大多数人来说可能已经足够了。转到设置(Settings)，然后是通知(Notifications)，然后点击消息(Messages)。
向下滚动(Scroll)到底部，您会看到一个名为Show Previews的选项。点击小切换按钮，使其不再是绿色。
现在，当您收到某人发来的短信或 iMessage(text or iMessage)信息时，您只会看到此人的姓名，而不会看到消息。而不是消息，您只会看到像iMessage这样的默认文本。
请注意，当您隐藏预览时，您将无法再从锁定屏幕(lock screen)回复消息，即使该选项已启用。这是有道理的，因为您如何回复您看不到的消息？
在锁定屏幕上显示
对于那些想要更多隐私和安全性(privacy and security)的人，您还可以再次转到通知(Notifications)-消息(Messages)并关闭更多项目。
下一步是禁用在锁定屏幕上显示(Show on Lock Screen)选项。当您现在收到消息时，锁定屏幕(lock screen)上甚至不会显示通知。相反，如果您将手机设为静音，手机会发出短信声音(text message sound)或振动。
当您解锁手机时，顶部会出现一个横幅，向您显示新消息。由于徽章应用程序图标(badge app icon)，您仍然可以看到有多少新消息到达。
最高安全级别是禁用徽章应用图标(Badge App Icon)、禁用通知声音(notification sound)和禁用通知中心(notification center)的消息。如果你这样做了，你甚至都不知道你什么时候收到了一条新消息。您必须手动打开消息应用程序(Messages app)才能查看任何新消息。即使您想要更多隐私和安全性(privacy and security)，这也可能有点多。
一个很好的平衡是关闭显示预览(Show Previews)并启用密码。这样您仍然会知道新消息何时到达，但只有在您解锁手机后才能看到它们。
短信转发
您还应该注意如何使用 iOS 上的另一个“有用”功能，称为文本消息转发，该功能可能会将您的消息暴露给不受欢迎的查看者。
如果您转到Settings，然后Messages，您将在 iMessage 下方看到此选项。如果启用它，您可以允许其他设备发送和接收短信，只要这些设备登录到同一个iMessage 帐户(iMessage account)即可。在这里，我启用了一台设备，即我的Macbook Pro 电脑(Macbook Pro computer)。
我之所以提到这一点，是因为大多数拥有 iPhone 的人也拥有Mac电脑、iPad、iPod Touches、i Mac s 等。如果您在所有设备上都登录了 iMessage 并启用了短信转发，那么您还需要确保所有这些其他设备至少也使用密码保护。
How to Hide Text Messages on the iPhone (Turn Off Preview)
By default, the iPhone will show the world your SMS texts and iMessages on your lock screen whether you have Touch ID or a passcode sеtup on your device. For most рeople, this isn’t a big deаl and therefore they don’t change the sеtting.
However, it can actually be a big privacy or security issue. For one thing, you never know what kind of text you’ll receive and who might happen to see it. With default settings, anyone who is within eyesight of your phone can read messages when they arrive because your phone will light up.
If they can physically touch the phone, they can not only read messages, but actually reply to them from the lock screen. This is true even if you have Touch ID or a passcode enabled.
From a security perspective, it can be dangerous for someone who has two-factor authentication enabled on websites. Many websites simply send you a code via text message, which can then easily be viewed by anyone in close proximity to you.
Thankfully, Apple has included a bunch of different options in the settings to control your privacy. In this article, I’ll show you how you can secure your text message so that only you see them.
Note that none of these settings below will help if you do not enable Touch ID or enable a passcode. Even if you configure your phone to show nothing on the lock screen, someone could easily just swipe to unlock your phone and read anything they want.
Show Previews
The first setting you can change is Show Previews, which will probably be enough for most people. Go to Settings, then Notifications, and tap on Messages.
Scroll down to the bottom and you’ll see an option called Show Previews. Tap the little toggle button so that it is no longer green.
Now when you get a text or iMessage from someone, you will only see the name of the person and not the message. Instead of the message, you will just see default text like iMessage.
Note that when you hide previews, you can no longer reply to the message from the lock screen, even if that option is enabled. This makes sense because how can you reply to a message you can’t see?
Show on Lock Screen
For those who want more privacy and security, you can also go to Notifications – Messages again and turn off a couple of more items.
The next step would be to disable the Show on Lock Screen option. When you receive a message now, not even a notification will show up on the lock screen. Instead, the phone will either make the text message sound or vibrate if you have it on silent.
When you unlock your phone, a banner will show up across the top showing you the new messages. You’ll also still be able to see how many new messages have arrived because of the badge app icon.
The maximum level of security is to disable Badge App Icon, disable the notification sound and disable messages in the notification center. If you do that, you won’t even know when you have received a new message. You’ll have to manually open the Messages app to see any new messages. That’s probably a bit much, even if you want more privacy and security.
A good balance is to turn off Show Previews and to enable a passcode. That way you will still know when new messages arrive, but can only see them after you unlock your phone.
Text Message Forwarding
You should also be careful about how you use another “useful” feature on iOS called text message forwarding that can expose your messages to unwanted viewers.
If you go to Settings, then Messages, you will see this option listed below iMessage. If you enable it, you can allow other devices to send and receive text messages as long as those devices are signed into the same iMessage account. Here I have one device enabled, namely my Macbook Pro computer.
I’m only mentioning this because most people who have an iPhone also have Mac computers, iPad, iPod Touches, iMacs, etc. If you are logged into iMessage on everything and have text message forwarding enabled, then you also need to ensure that all of those other devices are secured too with a password at least.
