最暗到最亮，範圍由0.0 ~ 1.0

UIScreen.mainScreen().brightness ＝1.0

 

參考資料：

http://stackoverflow.com/questions/24264673/adjust-the-main-screen-brightness-using-swift

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIScreen_Class/index.html#//apple_ref/occ/instp/UIScreen/brightness

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