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I want to build an iOs app like f.lux. It changes the screen brightness of device based on daytime. I know I have to jailbreak my device. But I don't know how to implement this app.
Please suggest me any useful API to do that.
Thanks in advance.
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To adjust the color temperature to be warmer or colder, go to Settings > Display & Brightness > Night Shift and use the color-temperature slider. Some display accessibility settings, including Invert Colors, Grayscale, and Increase Contrast, might turn off True Tone.
To change your iPhone back to color, go to Settings -> Accessibility -> Display & Text Size and turn off the switch next to Color Filters. Your iPhone will instantly change from black and white to full color. Problem solved — probably.
iOS already has that system-wide feature built-in: see Settings > Brightness & Wallpaper, under Auto-Brightness:
Although it is possible to programmatically control the device's brightness, there is not a public API for determining the outside light, so this is functionality that the OS handles.
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