在IOS 6+中,你可以.
[myAVCaptureDevice setTorchModeOnWithLevel:0.5 error:NULL]; <== range is (0,1.0] (don't send 0)
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您可以枚举av捕获设备,如下所示:
NSArray * devices = [AVCaptureDevice devices];
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并确定哪些有火把(即没有麦克风:):
myAVCaptureDevice.hasTorch
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