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我从 ipod touch 4 开发了一个应用程序,但不幸的是它不占用接近传感器,但我想通过触发相机的亮度来启动和停止某个事件,这可以实现吗?如果是这样,它会消耗更多的CPU吗?还有我可以同时使用这两个相机吗?