ASCScreenBrightnessDetector lets you easily detect screen brightness changes and provides some useful delegate methods.

For Example it's very easy to switch between a day and night theme optimized for different lighting conditions:

Usage

This repository contains an example project that uses the methods provided by ASCScreenBrightnessDetector - just build and run to see it in action.

Please note: The screen brightness detection will only work on a real device, the Xcode Simulators screen brightness is always 0.5.

Wherever you want to use ASCScreenBrightnessDetector, import the header file as follows:

#import "ASCScreenBrightnessDetector.h"

or when using CocoaPods:

#import <ASCScreenBrightnessDetector/ASCScreenBrightnessDetector.h>

To detect the current screen brightness or style you can easily use:

ASCScreenBrightnessDetector *brightnessDetector = [ASCScreenBrightnessDetector new];

NSLog(@"Screen brightness: %f", brightnessDetector.screenBrightness);

ASCScreenBrightnessStyle style = brightnessDetector.screenBrightnessStyle;
switch (style) {
    case ASCScreenBrightnessStyleDark:
        // Do something, e.g. set a dark theme.
        break;
    case ASCScreenBrightnessStyleLight:
        // Do something else, e.g set a light theme.
        break;
}

To continuously detect screen brightness changes implement ASCScreenBrightnessDetector as an instance variable, set the delegate and use the following delegate methods:

- (void)screenBrightnessDidChange:(CGFloat)brightness
{
    NSLog(@"The new brightness is: %f", brightness);
}

- (void)screenBrightnessStyleDidChange:(ASCScreenBrightnessStyle)style
{
    NSLog(@"The new style is: %u", style);
}

Properties

The object that acts as the delegate.

id<ASCScreenBrightnessDetectorDelegate> delegate;

The brightness level of the screen between 0.0 and 1.0, inclusive. (read-only)

CGFloat screenBrightness;

The style indicates if the screen brightness is dark or light and depends on the defined threshold. (read-only)

ASCScreenBrightnessStyle screenBrightnessStyle;

The threshold determines whether the brightness style is light or dark. It must have a value between 0.0 and 1.0, inclusive. The default value is 0.5.

 CGFloat threshold;

Delegate Methods

Tells the delegate when the screens brightness changed and returns a float value between 0.0 and 1.0, inclusive.

- (void)screenBrightnessDidChange:(CGFloat)brightness;

Tells the delegate when the screens brightness style changed and returns an ASCScreenBrightnessStyle enumeration.

- (void)screenBrightnessStyleDidChange:(ASCScreenBrightnessStyle)style;

Installation

Manually

Drag the ASCScreenBrightnessDetector.h and ASCScreenBrightnessDetector.m source files to your project and your are done.

Author

André Schneider, @aschndr

License

ASCScreenBrightnessDetector is available under the MIT license. See the LICENSE file for more info.