JCBrightness
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gradually adjust brightness of screen
JCBrightness
仿支付宝二维码页面，多线程逐步调整屏幕亮度。
##使用方法
// 设置亮度
[JCBrightness graduallySetBrightness:0.9];
// 恢复亮度
[JCBrightness graduallyResumeBrightness];
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