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以往，我们可以通过从主屏幕底部向上滑动到达控制中心，然后点击手电筒选项来快速访问手电筒。但升级至iOS15以后有部分用户发现设备上无法再访问手电筒了，手电筒图标变成了灰色的，由于灰色开关对您的触摸没有反应，因此无法再使用手电筒。为什么...