被留在黑暗中很糟糕，但更糟糕的是发现你值得信赖的 iPhone（或 iPad！）手电筒无法打开，并且控制中心中的手电筒图标呈(Control Center)灰色。
好消息是你的手电筒可能没问题。坏消息是，您可能需要进行一些快速而肮脏的故障排除才能恢复灯光。为僵尸末日中的人们深感抱歉。但是嘿，至少你还有互联网连接！
1. 重新启动你的iPhone
有时，当您手机的手电筒呈灰色时，可能是由小软件问题引起的暂时故障。重新启动设备可以清除导致问题的任何错误并刷新设备。
在 iPhone 上，按住电源(Power)按钮（也称为Sleep/Wake按钮），直到屏幕上出现滑动关闭电源滑块。(Slide)然后，将滑块向右滑动以关闭设备。
手机完全关闭后，再次按住电源(Power)按钮将其重新打开，您将看到Apple徽标出现。
2.更新至最新(Latest)iOS版本
出于安全原因并确保手机的所有功能（例如蓝牙(Bluetooth)和Wi-Fi）正常运行，保持手机软件处于最新状态至关重要。有时，您的手电筒会变灰，因为您的手机软件需要更新，而问题是由某个错误引起的。
要更新手机的固件，请转至Settings > General > Software Update。
如果有可用的更新，它将显示在此处。按照提示下载并安装 iOS 或 iPadOS 的更新。根据更新大小和您的互联网连接速度，此过程可能需要几分钟或更长时间。
更新完成后再次使用手电筒。如果问题仍然无法解决，您可以尝试其他可能的修复方法来解决问题。
3. 重置iPhone(Your)上的
设置
如果您的手电筒因软件问题而变灰，重置 iPhone 的设置会有所帮助。当您重置设置时，它不会删除任何数据，而是会将设置恢复为默认值。如果默认设置发生更改，从而导致手电筒出现问题，这会有所帮助。
要重置 iPhone 的设置，请前往Settings > General > Transfer或重置(Reset)iPhone”，最后点击“重置”(Reset)。
此处您将有多个选项，例如重置所有设置(Reset All Settings)或重置网络设置(Reset Network Settings)。选择最能解决您在使用手电筒时遇到的问题的选项。最好从“重置所有设置”(Reset All Settings)选项开始。
请务必注意，重置设置将删除您所做的任何自定义设置，包括自定义铃声、壁纸和其他自定义设置。因此您需要再次重做这些设置。
4.关闭使用Flash的
第三方应用程序(Apps)
有时，您的手电筒会变灰，因为另一个应用程序当前正在使用它。如果您正在运行使用闪光灯的应用程序（例如相机应用程序），然后尝试使用手电筒，则可能会发生这种情况。在这种情况下，当前使用闪光灯的应用程序将具有优先权，并且内置手电筒将显示为灰色。
要解决此问题，您需要关闭当前使用 Flash 的所有第三方应用程序。为此，请双击“主页”(Home)按钮以打开“应用程序切换器”(App Switcher)。在没有“主页”按钮的(Home)Apple设备上，从主(Home)屏幕的底部边缘向上滑动，直到看到应用程序切换器。
然后，向左或向右滑动以找到正在使用闪光灯的应用程序，然后向上滑动并离开屏幕顶部以将其关闭。
5. 检查相机访问权限(Camera Access Permissions)
有时，您的手电筒会变灰，因为您使用的应用程序没有访问相机的权限。如果无法访问相机，应用程序将无法打开手电筒。
- 要检查应用程序是否可以访问相机，请转到手机的设置应用程序，然后点击隐私(Privacy)和安全(Security)。
- 接下来，选择相机(Camera)。在这里，您将看到已请求访问手机不同部分（包括相机）权限的所有应用程序的列表。
- 如果您看到想要使用手电筒的应用程序，但它没有访问相机的权限，请切换开关以允许它。
检查应用程序是否已更新也很好。有时，过时的应用程序可能与最新的 iOS/Android 版本不兼容，并且该应用程序可能需要修复，或者手电筒功能可能无法使用。
授予应用程序访问相机的权限后，请尝试再次使用手电筒。
6. 检查电池电量(Battery)是否不足并禁用低功耗模式(Disable Low Power Mode)
您的手机电池可能电量不足，并且您的手机处于低电量模式。在低功耗模式下，您的手机将通过禁用某些功能（例如闪光灯）来节省电池，以帮助延长电池寿命。
要检查手机的电池电量，请查看屏幕右上角的电池图标。如果电量低，请尝试为手机充电。如果无法充电，请尝试禁用低功耗模式(disabling low-power mode)。
7. 尝试使用Siri打开手电筒
当你的手电筒变灰时，另一个可以尝试的快速修复方法是让Siri将其打开。Siri是 Apple 的虚拟助手，可以帮助您执行各种任务，包括打开手电筒。
要使用Siri打开手电筒，只需按住主屏幕(Home)按钮或说“嘿 Siri”(Hey Siri)（如果您已设置）并说“打开(Turn)手电筒”。” Siri应该通过为你打开手电筒来回应。
如果Siri无法打开手电筒，可能是由于软件问题造成的。您可能需要尝试其他可能的修复方法来解决该问题。
8.在控制中心(Control Center)检查手电筒(Flashlight) 设置(Settings)
当手电筒变灰时，可以尝试的另一个快速修复方法是检查控制中心(Control Center)中的手电筒设置。控制中心(Control Center)是 iPhone 上的一项功能，可让您快速访问和控制特定设置，例如手电筒。
要访问控制中心(Control Center)，请从屏幕右上角向下滑动。接下来，您应该在控制中心看到(Control Center)手电筒(Flashlight)按钮。如果该按钮呈灰色，请尝试点击它来打开手电筒。
如果按钮未呈灰色，请确保手电筒已设置为打开。此外，您还可以通过长按控制中心(Control Center)中的手电筒按钮来检查手电筒的亮度级别。
9. 恢复手机
有时，您无法通过上述方法修复软件问题。在这种情况下，恢复 iPhone 会有所帮助。
当您恢复 iPhone 时，它会擦除设备上的所有数据和设置，并将其恢复为原始出厂设置。这是您可以对 iPhone 进行的最明确的软件系统修复形式，但它应该是最后的手段。
要恢复 iPhone，您需要将其连接到电脑并使用 iTunes 或 iCloud 来完成该过程。请记住，恢复 iPhone 会清除设备上的所有数据、设置和应用程序，因此在恢复之前请备份所有重要数据(back up any important data)。
有关恢复模式的详细说明，请参阅如何在 iPhone 和 iPad 上使用 DFU 模式(How to Use DFU Mode on iPhone and iPad)。DFU模式还可以解决因硬件和固件编程错误而导致的问题
。(DFU)
恢复 iPhone 后，您可以尝试再次使用手电筒。如果问题仍然存在，则可能是硬件问题，您可能需要联系Apple 支持(Apple Support)以获得进一步帮助。特别是当您怀疑LED闪光灯本身有故障时。
Is Your iPhone Flashlight Greyed Out? Try These 9 Fixes
Being left in the dark sucks, but what sucks even more is finding your trusty іPhone (оr iPad!) flaѕhlight won’t turn on, and the flashlight iсon іn the Control Center iѕ greyed out.
The good news is that your flashlight is probably okay; the bad news is that you may have to do some quick and dirty troubleshooting to get your light back. So sorry for those of you in a zombie apocalypse. But hey, at least you still have an internet connection!
1. Reboot Your iPhone
Sometimes, when your phone’s flashlight is greyed out, it could be a temporary glitch caused by a minor software issue. Restarting your device can clear any bugs causing the problem and refresh the device.
On an iPhone, press and hold the Power button (also known as the Sleep/Wake button) until the Slide to power off slider appears on the screen. Then, slide the slider to the right to turn off your device.
Once your phone has fully shut down, press and hold the Power button again to turn it back on, and you’ll see the Apple logo appear.
2. Update to the Latest iOS Version
Keeping your phone’s software up to date is essential for security reasons and ensuring that all of its features (such as Bluetooth and Wi-Fi) are functioning correctly. Sometimes, your flashlight is greyed out because your phone’s software needs to be updated, and a bug is causing the issue.
To update your phone’s firmware, go to Settings > General > Software Update.
If there is an available update, it will show up here. Follow the prompts to download and install the update for iOS or iPadOS. Depending on the update size and your internet connection speed, this process may take a few minutes or longer.
Use the flashlight again after the update is done. You can try other potential fixes to troubleshoot the problem if it’s still not working.
3. Reset the Settings on Your iPhone
Resetting your iPhone’s settings can help if your flashlight is greyed out because of a software issue. When you reset your settings, it will not delete any data but will return the settings to their defaults. This can help if a setting has changed from the default, causing an issue with the flashlight.
To reset your iPhone’s settings, go to Settings > General > Transfer or Reset iPhone, and finally, Reset.
You will have several options from here, such as Reset All Settings or Reset Network Settings. Select the option that will best address the problem you’re experiencing with your flashlight. It’s always better to start with the Reset All Settings option.
It’s important to note that resetting the settings will remove any custom settings you’ve made, including custom ringtones, wallpaper, and other customizations. So you’ll need to redo those settings again.
4. Close Third-Party Apps That Use the Flash
Sometimes, your flashlight is greyed out because another app is currently using it. This can happen if you’re running an app that uses the flash, like a camera app, and then try to use the flashlight. In this case, the app currently using the flash will have priority, and the built-in flashlight will be greyed out.
To fix this, you’ll need to close any third-party apps currently using flash. To do this, double-click the Home button to open the App Switcher. On Apple devices without a Home button, swipe up from the bottom edge of the Home screen until you see the app switcher.
Then, swipe left or right to find the app that’s using the flash, and swipe it up and off the top of the screen to close it.
5. Check for Camera Access Permissions
Sometimes, your flashlight is greyed out because the app you’re using doesn’t have permission to access the camera. Without access to the camera, the app won’t be able to turn on the flashlight.
- To check if an app can access the camera, go to your phone’s settings app, then tap on Privacy & Security.
- Next, select Camera. Here, you’ll see a list of all the apps that have requested permission to access different parts of your phone, including the camera.
- If you see an app that you want to use the flashlight with, but it doesn’t have permission to access the camera, toggle the switch to permit it.
It’s also good to check if the app is updated. Sometimes, an outdated app might not be compatible with the latest iOS/Android version, and the app might need to be fixed, or the flashlight feature might not work.
Once you’ve given the app permission to access the camera, try using the flashlight again.
6. Check for Low Battery and Disable Low Power Mode
Your phone’s battery may be running low, and your phone is in low power mode. In low power mode, your phone will conserve battery by disabling certain features, like the flash, to help prolong the battery life.
To check your phone’s battery level, look at the screen’s battery icon in the top right corner. If it’s low, try charging your phone. If you’re unable to charge it, try disabling low-power mode.
7. Try Using Siri to Turn On the flashlight
Another quick fix to try when your flashlight is greyed out is to ask Siri to turn it on. Siri is Apple’s virtual assistant that can help you perform various tasks, including turning on the flashlight.
To use Siri to turn on the flashlight, simply press and hold the Home button or say Hey Siri (if you’ve set it up) and say, “Turn on the flashlight.” Siri should respond by turning on the flashlight for you.
If Siri cannot turn on the flashlight, it could be due to a software issue. You may need to try other potential fixes to troubleshoot the problem.
8. Check Flashlight Settings in Control Center
Another quick fix to try when your flashlight is greyed out is to check the flashlight settings in the Control Center. The Control Center is a feature on iPhone that allows you to quickly access and control specific settings, such as the flashlight.
To access the Control Center, swipe down from the top right corner of the screen. Next, you should see the Flashlight button on the Control Center. If the button is greyed out, try tapping it to turn on the flashlight.
If the button is not greyed out, make sure the flashlight is set to on. Also, you can check the brightness level of the flashlight by long pressing the flashlight button in the Control Center.
9. Restore the Phone
Sometimes, you can’t fix a software issue through the above means. In this case, restoring your iPhone can help.
When you restore iPhones, it erases all of the data and settings on the device and returns it to its original factory settings. It’s the most definitive form of software system repair you can do for an iPhone, but it should be a last resort.
To restore your iPhone, you’ll need to connect it to a computer and use iTunes or iCloud to complete the process. Keep in mind that restoring your iPhone will erase all of the data, settings, and apps on your device, so back up any important data before restoring.
For detailed instructions on recovery mode, head over to How to Use DFU Mode on iPhone and iPad. The DFU mode also resolves issues resulting from faulty hardware and firmware programming.
After you have restored your iPhone, you can try to use the flashlight again. If the issue still persists, it might be a hardware issue, and you may need to contact Apple Support for further assistance. Especially if you suspect the LED flash itself is faulty.
