TrollLEDs

A TrollStore application to control individual flashlight LEDs for iOS devices.

When used on a jailbroken device, remove Amber tweak because this app will simply be overridden by it.

Compatibility

• iOS 11 or higher
• iPhone or iPad with multiple of different flashlight LEDs (e.g. amber and regular white)
• Devices with a single-color flashlight LED are not supported, such as iPhone 4s and iPhone 5
• iPhone 14 series and higher are not supported, as Apple has completely redesigned the flashlight LEDs

Usage (Quad-LEDs Devices)

Quad-LEDs devices are the devices that the private API SetTorchManualParameters can successfully adjust the LEDs. SetTorchManualParameters expects four parameters (LED levels of White 1, White 2, Amber 1 and Amber 2). This includes most modern devices with flashlight LEDs such as iPhone 11 (two physical LEDs) and iPad Pro 3rd generation (four physical LEDs).

LED Sliders

There are four sliders in the app:

1. Cool LED 0 - The brightness of the first white LED
2. Cool LED 1 - The brightness of the second white LED (if the device has it)
3. Warm LED 0 - The brightness of the first amber LED
4. Warm LED 1 - The brightness of the second amber LED (if the device has it)

Each slider can be adjusted independently. The more the value, the more brightness of the LED will get. If the value is set to 0, the LED will be off. If all sliders are set to 0, all LEDs will be off.

Devices with four physical LEDs such as iPad Pro 3rd generation will get the maximum brightness of the LEDs when all sliders are set to 100%. However, devices with two physical LEDs such as iPhone 11 will get the maximum brightness of the LEDs when Cool LED 0 and Warm LED 0 are set to 100%, while the others are set to 0%. The Cool LED 1 and Warm LED 1 sliders only act as a low brightness mode for their LED 0 equivalent.

Physical LED Count

Despite being categorized as a quad-LEDs device, it may have only two physical LEDs. TrollLEDs allows you to explicitly set the physical LED count in the app (There is no good way to automatically detect the physical LED count, yet).

If the value is set to Dual:

1. The app shortcut Amber On will maximize the Warm LED 0 slider only
2. The app shortcut White On will maximize the Cool LED 0 slider only
3. The app shortcut All On will maximize the Cool LED 0 and Warm LED 0 sliders only

If the value is set to Quad, the app shortcuts will maximize all related sliders.

Usage (Dual-LEDs Devices)

Dual-LEDs devices are the devices that the private API SetTorchManualParameters cannot be used. They mostly come with two physical LEDs (white and amber), and are old devices, such as iPhone 5s and iPhone SE 1st generation.

There are two sliders in the app:

1. Torch Level - The brightness of the LEDs
2. Warmth - The "warmth" of the light color

Unlike Amber tweak, this app cannot force the two LEDs to be on at the same time. You can use Torch Level slider to control the brightness of the LEDs just as you can from the Control Center, but the Warmth slider will only set the warm percentile of the scene. The more the value, the more brightness of the amber LED will get, resulting in a warmer light color. If Warmth is set to the max, only the amber LED will be on.

Limitation

Exclusive Control

TrollLEDs utilizes the mediaserverd-exclusive BWFigCaptureDeviceVendor class to control the flashlight LEDs. This creates an instance of BWFigCaptureDevice (or OpaqueFigCaptureDeviceRef). There can only be one instance at a time, so if there is another app that creates it (i.e., mediaserverd), TrollLEDs will not be able to control the flashlight LEDs. This is why there is a switch at the top of the app to lock the flashlight LEDs to TrollLEDs only. If you want to use the LEDs (or use the Camera app) from somewhere else, you can either turn off the switch (and wait few seconds) or kill the app.

Battery Concern

As long as TrollLEDs app is running, the flashlight device connection will be kept alive. This may cause battery drain, as reported by some users. To mitigate this issue, the app will automatically kill itself after 5 minutes of inactivity.

Building

Build .tipa (sandboxed and unsandboxed) and .deb (rootful and rootless) with:

./build.sh

Future Plans

1. More accessible sliders (are they too small?)
2. Better error handling?
3. As AppIntents metadata can only be generated from Xcode, we should find a way to generate it from theos