智能手机包含大量信息，例如我们朋友和家人的照片和视频，但它们还包含我们用来发送和接收官方电子邮件、进行银行业务等的重要应用程序。(important apps)
虽然这些应用程序使任务更容易完成，我们的生活更方便，但我们往往担心让其他人使用我们的 iPhone，以免他们访问我们的应用程序和私人信息。对于孩子经常使用手机玩游戏或使用儿童应用程序的父母来说，情况更糟，因为他们担心孩子可能会看到他们不应该看到的东西，或者删除重要的文件或媒体。
值得庆幸的是，您不必再担心，因为您可以通过多种方式限制对您的私人信息的访问并完全锁定应用程序。
如何锁定 iPhone 上的应用程序(How To Lock Apps On Your iPhone)
您可以锁定您的 iPhone 并阻止任何人访问它，但您可以锁定应用程序并确保最重要的应用程序安全，即使其他人可以访问您的设备。
iPhone 没有系统级的应用程序锁定功能，这意味着您只能锁定这么多应用程序。但是，在 iOS 12 发布之前，它具有内置的应用程序限制，现在可以在新的屏幕时间(Screen Time)实用程序中找到。
此外，您无法完全隐藏应用程序，但您可以使用一些技巧来保护应用程序设置并获得相同的结果。
您可以通过以下五种不同的方式锁定 iPhone 上的应用程序并防止他人访问您的私人信息。
设置内容和隐私限制(Set Content & Privacy Restrictions)
在“屏幕使用时间”(Screen Time)中，您可以使用iPhone 上的“内容(Content)和隐私(Privacy) 限制(Restrictions)”设置来阻止或限制特定的应用程序和功能。这样，您可以限制隐私设置，以及购买、下载和露骨内容的设置。
前往iPhone 上的“设置” ，然后点击(Settings )“屏幕使用时间”(Screen Time)。
点击这是我的 [设备](This is My [Device])或这是我孩子的 [设备](This is My Child’s [Device])。
如果您是家长并且不希望您的孩子更改您的设置，请点击使用屏幕时间密码(Use Screen Time Passcode)并创建密码，然后再次输入以确认。如果是您孩子的 iPhone，请按照说明操作，直到Parent Passcode，然后输入密码。
返回主屏幕，点击内容和隐私限制(Content & Privacy Restrictions)并输入密码（与解锁 iPhone 的密码不同）。
打开/绿色内容和隐私(Content & Privacy )开关。
对于运行 iOS 11 或更低版本的旧版 iPhone，请前往Settings > General > Restrictions > Enable Restrictions。
输入新密码，您将看到各种选项，包括：
- 允许(Allow)，您可以在其中禁止FaceTime、Safari和Siri等第一方应用，但不允许下载的应用。这是从主屏幕上删除应用程序的临时方法，但您只能在重新允许后才能访问它们。
- 允许的内容(Allowed Content)，您可以在其中设置其他人可以查看的内容的家长控制
- 隐私(Privacy)，因此没有人可以更改您的隐私设置
- 允许更改(Allow Changes)，冻结各种选项，如音量限制等。
引导访问(Guided Access)
也称为密码应用程序锁定(password app lock)，如果有人在您的 iPhone 上使用特定应用程序，并且您不希望他们冒险使用其他应用程序，此方法会派上用场。您可以使用引导访问(Guided Access)设置锁定并防止他们离开他们当前使用的应用程序。
打开设置(Settings)，然后点击General>Accessibility。
接下来，点击Guided Access并将其切换为绿色或ON。
点击密码设置(Passcode Settings)
点击设置引导访问密码(Set Guided Access Passcode )并输入新密码。
要启动引导式访问(Guided Access)会话，请打开一个应用程序并按三次主页按钮。(Home)如果您使用的是 iPhone X，请按三下侧边(Side)按钮。在那里，您可以执行以下任何操作：
- 在您想要停止响应触摸的屏幕区域周围画一个圆圈，然后点击开始(Start)
- 点击(Tap) 选项(Options)以禁用特定功能，如键盘、触摸屏、音量按钮等，或为会话设置时间限制
完成后，单击主页(Home)按钮三次（或iPhone X 的侧边按钮）结束会话，输入(Side)引导访问(Guided Access)密码，然后点击结束。
设置时间限制(Set Time Limits)
如果您想缩减您的孩子或其他人在您的 iPhone 上花费的时间，您可以设置屏幕时间限制，以阻止特定应用程序或限制在这些应用程序上花费的时间。
打开Settings > Screen Time > App Limits
点击>Add Limit
从应用程序列表中，选择您要限制访问的应用程序，然后点击其类别旁边的复选框按钮
选择时间限制(time limit )（您希望限制持续多长时间）。
最后，点击添加(Add )（右上角）以保存设置。
触控 ID 和面容 ID(Touch ID and Face ID)
与使用密码相比，指纹或触控 ID(Touch ID)和面容 ID(Face ID)是访问 iPhone 的安全方式。它们还可以方便地锁定您的屏幕和保护应用程序，特别是如果您不在设备附近并且它已解锁，或者其他人正在使用它并且您担心他们可能会徘徊并查看敏感信息。
要使用 Touch ID 锁定应用程序，请打开设置(Settings)。点击触控 ID 和密码(Touch ID & Passcode )并输入您的密码。
打开（绿色(ON)）您要锁定的应用程序。您还可以点击其他应用程序(Other Apps )以查看可以使用 Touch ID 或Face ID进行身份验证的应用程序列表。
注意：(Note:)这些步骤涵盖Apple Pay、iTunes 和App Store应用程序。App Store中的任何其他应用程序都可以通过转到应用程序的Settings > Preferences（或隐私）并点击锁定(Lock)（它也可能标记为密码(Password)、屏幕锁定(Screen Lock)、密码(Passcode)、触摸 ID 锁定(Touch ID Lock)或类似名称）来锁定。
如今，越来越多的应用程序提供了使用 Touch ID 或Face ID(Face ID)锁定它们的选项，而其他应用程序仍然提供密码选项。
第三方应用程序储物柜(Third Party App Locker)
您可以使用许多第三方应用程序来限制使用密码或生物识别 ID 访问您的 iPhone 应用程序。但是，如果您的 iPhone 没有越狱，这可能不是一个好的选择，因为它可能会带来安全和性能问题。
您还可以考虑使用第三方保管库应用程序来隐藏图像或注释(notes)等文件，仅在输入正确密码后授予访问权限，或者锁定特定文件而不是完全锁定整个应用程序。
5 Ways To Prevent Other People From Accessing Apps On Your iPhone
Smartphones hold loadѕ of information like photos and vidеos of oυr friends and fаmilies, but they also contain important apps that we use to send and receive official emails, do banking, and much more.
While these apps make tasks easier to do, and our lives more convenient, we tend to worry about letting someone else use our iPhones lest they access our apps and private information. It’s worse for parents whose kids constantly use their phones to play games or use kiddie apps, as they fear the kids may see stuff they shouldn’t, or delete important files or media.
Thankfully, you never have to worry again as there are ways you can limit access to your private information and lock the apps altogether.
How To Lock Apps On Your iPhone
You could just lock your iPhone and prevent anyone from accessing it, but you can lock apps and keep the most important ones safe even though someone else can access your device.
The iPhone doesn’t have a system-level feature for app locking, which means you can only lock so many apps. However, before the release of iOS 12, it had built-in app restrictions, which are now found in the new Screen Time utility.
Furthermore, you can’t completely hide apps from view, but you can use a few hacks to protect app settings and achieve the same result.
Here are five different ways you can lock apps on your iPhone and prevent others from accessing your private information.
Set Content & Privacy Restrictions
In Screen Time, you can block or limit specific apps and features using the Content & Privacy Restrictions setting on iPhone. This way, you can restrict privacy settings, as well as settings for purchases, downloads, and explicit content.
Go to Settings on your iPhone and tap Screen Time.
Tap This is My [Device] or This is My Child’s [Device].
If you’re the parent and don’t want your child to change your settings, tap Use Screen Time Passcode and create a passcode, then enter it again to confirm. If it’s your child’s iPhone, follow the instructions until Parent Passcode, and then enter a passcode.
Back at the main screen, tap Content & Privacy Restrictions and enter a passcode (different from the one you unlock your iPhone with).
Turn on/green the Content & Privacy switch.
For older iPhones running iOS 11 or lower, go to Settings > General > Restrictions > Enable Restrictions.
Enter a new passcode, and you’ll see a variety of options including:
- Allow, where you can disallow first-party apps like FaceTime, Safari and Siri, but not downloaded apps. This is a temporary way of removing apps from appearing on the home screen, but you can only access them after re-allowing them.
- Allowed Content, where you can set parental controls on what others can view
- Privacy so no one can change your privacy settings
- Allow Changes, to freeze varied options like volume limit and more.
Guided Access
Also known as password app lock, this method comes in handy if someone is using a particular app on your iPhone, and you don’t want them venturing to other apps. You can set the lock using Guided Access and prevent them from leaving the app they’re currently using.
Open Settings, then Tap General>Accessibility.
Next, tap Guided Access and toggle it to green or ON.
Tap Passcode Settings
Tap Set Guided Access Passcode and type a new passcode.
To start a Guided Access session, open an app and press the Home button thrice. If you’re using an iPhone X, press the Side button three times. Once there, you can do any of the following:
- Draw a circle around the areas of your screen that you want to stop responding to touch, and then tap Start
- Tap Options to disable specific features like keyboard, touchscreen, volume buttons and more, or to set a time limit for the sessions
When you’re done, end the session by clicking the Home button three times (or Side button for iPhone X), enter your Guided Access passcode, and tap End.
Set Time Limits
If you want to scale back the time your kids or others spend on your iPhone, you can set screen time limits that’ll block particular apps or limit how much time is spent on them.
Open Settings > Screen Time > App Limits
Tap >Add Limit
From the list of apps, pick the app you want to restrict access to and tap the checkbox button next to its category
Select a time limit (how long you want the restriction to last).
Finally, tap Add (top right) to save the settings.
Touch ID and Face ID
Fingerprint or Touch ID and Face ID are secure ways of accessing your iPhone, compared to using passwords. They’re also convenient for locking your screen and protecting apps especially if you’re not near your device and it’s unlocked, or someone else is using it and you worry they might wander and view sensitive information.
To lock apps with Touch ID, open Settings. Tap Touch ID & Passcode and type your passcode.
Toggle ON (green) the apps you want to be locked. You can also tap on Other Apps to see a list of apps that can use Touch ID or Face ID for authentication.
Note: These steps cover Apple Pay, iTunes, and App Store apps. Any other apps from the App Store can be locked by going to the app’s Settings > Preferences (or Privacy) and tapping Lock (it may also be labeled as Password, Screen Lock, Passcode, Touch ID Lock, or similar).
A growing number of apps today offer the option to lock them using Touch ID or Face ID, while others still offer the passcode option.
Third Party App Locker
There are many third-party apps you can use to limit access to your iPhone apps using a passcode or biometric ID. However, if your iPhone isn’t jailbroken, this may not be a good option as it may come with security and performance issues.
You can also consider a third-party vault app to hide files like images or notes, granting access only after the right password is entered, or to lock specific files instead of the whole app altogether.
