[翻译] ASCScreenBrightnessDetector

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ASCScreenBrightnessDetector

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:

ASCScreenBrightnessDetector能让你非常便利的检测屏幕亮度，并提供实用的代理方法供你使用。

例如，下面的例子中，在白天和黑夜之间切换可以适用不同的主题。

Usage

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

这个例子中已经包含了使用样例-你可以编译然后自己看一下效果。

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

注意：屏幕亮度检测只会在真实的设备上使用，模拟器上面永远都是0.5.

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

单例想用ASCScreenBrightnessDetector的时候，导入头文件：

#import "ASCScreenBrightnessDetector.h"

or when using CocoaPods:

如果你用的是CocoaPods，就这么导入头文件：

#import <ASCScreenBrightnessDetector/ASCScreenBrightnessDetector.h>

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

为了检测当前屏幕亮度，你可以这样子使用：

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:

为了实时监测屏幕亮度的变化，你需要初始化ASCScreenBrightnessDetector这个实例变量，然后设置一个代理：

- (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.

这是一个代理对象。

id<ASCScreenBrightnessDetectorDelegate> delegate;

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

亮度的值是只读的，介于0.0与1.0之间（包括0.0与1.0）

CGFloat screenBrightness;

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

亮度指示器用以表示屏幕是亮的还是暗的（只读）

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.

这个值标示着明与暗之间的分割线，其值介于0.0到1.0之间，默认值是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.

你可以从这个代理方法中获取到亮度的变化，介于0.0与1.0之间（包含0.0与1.0）

- (void)screenBrightnessDidChange:(CGFloat)brightness;

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

你可以从这个代理方法中获取亮度风格的变化

- (void)screenBrightnessStyleDidChange:(ASCScreenBrightnessStyle)style;

Installation

From CocoaPods

ASCScreenBrightnessDetector is available through CocoaPods, to install it simply add the following line to your Podfile:

ASCScreenBrightnessDetector支持CocoaPods，你可以通过以下一句话来安装到Podfile当中：

pod "ASCScreenBrightnessDetector"

Manually

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

将ASCScreenBrightnessDetector.h与ASCScreenBrightnessDetector.m拖到你的项目当中。

Author

André Schneider, @aschndr

License

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

[翻译] ASCScreenBrightnessDetector

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原文地址：http://www.cnblogs.com/YouXianMing/p/4274020.html