iOS在程序中控制系统的屏幕亮度

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参考原文

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// 0 .. 1.0, where 1.0 is maximum brightness. Only supported by main screen.
@property(nonatomic) CGFloat brightness NS_AVAILABLE_IOS(5_0) __TVOS_PROHIBITED;
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//获取系统屏幕当前的亮度值
CGFloat value = [UIScreen mainScreen].brightness;
//设置系统屏幕亮度值
value += 0.8;
[[UIScreen mainScreen] setBrightness:value];