Is it possible to dim the light of iPhone's camera flash light programmatically?

Question

Is it possible to dim the light of iPhone's camera flash light programmatically?

Please let me know.

Answer 1

从iOS 6.0开始，有一个新的调用setTorchModeOnWithLevel ，它允许您设置火炬级别。

- (BOOL)setTorchModeOnWithLevel:(float)torchLevel error:(NSError **)outError 

Answer 2

iOS5 will help you with this. It is still under NDA. I suggest you look in the beta documentation for AVCaptureDevice or ask on the Apple developer forum.

It is not possible in iOS4.3.

When the NDA is lifted I will edit this response to give the documentation link.

EDIT

Sorry, it looks like Apple removed the ability to change the torch level in the public release of iOS5. The torchLevel property of AVCaptureDevice is now read-only.

Answer 3

Something like this should work i think:

AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if ([device hasTorch]) {
  [device lockForConfiguration:nil];
  [device setTorchMode:AVCaptureTorchModeOff];
  [device unlockForConfiguration];
}

Answer 4

I don't think that still they have these controls in Public APIs for the developers to change it.

I think we can turn it on or off as it is many torch applications but I don't think we can decrease the intensity(ie dim the flash light) .

There are signs that this may get into public API onc iOS5 is launched but for now, it is not possible.

Also using iOS5 beta for development would not help as some of the features in iOS5 are still errorneous and are yet to be solved.

Hopefully it will get resolved in the final release.

Hope this helps you. :)