iPhone 4's LED Backlight

Question

I am trying to figure out how to use the UIIMagePicker or some way to use the iPhone 4's Backlight LED. I am trying to use a UIView with a button on it to turn the LED on & off without showing any video. Is this even possible? Any help?

EDIT

I've been using AVCaptureDevice class or at least trying to. When it comes to importing #import It tells me it isnt valid.

The code I am trying to use is http://twitpic.com/23lv9v

Please see my answer here for future reference: http://stackoverflow.com/questions/3190034/turn-on-torch-flash-on-iphone-4/3367424#3367424 — iwasrobbed, Jul 29 '10 at 22:22

score 2 · Accepted Answer · answered Jul 08 '10 at 20:20

2

You have to enable the camera for that. Look at the AVCaptureDevice Class and possibly AVCaptureTorchMode and AVCaptureFlashMode.

answered Jul 08 '10 at 20:20

Sharjeel Aziz

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There's no need to even show the video when you're using the AVCaptureDevice, let along place a UIView over it. – Tom Irving Jul 08 '10 at 21:52
Thank you very much. I am going to have to takew a look at this. – Frankrockz Jul 09 '10 at 00:46

score 0 · Answer 2 · answered Jul 09 '10 at 07:27

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you need to set [videoCaptureDevice lockForConfiguration:nil]; then you can turn on the torch...

See the docs: http://developer.apple.com/iphone/library/documentation/AVFoundation/Reference/AVCaptureDevice_Class/Reference/Reference.html

answered Jul 09 '10 at 07:27

Gustavo Barrientos

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I see. Ill try that when I get home later on :) Thanks – Frankrockz Jul 09 '10 at 14:06
BTW! I tried your code in my XCode, in Simulator the code crashes, but, i tried in the device mode, and it works!. – Gustavo Barrientos Jul 09 '10 at 21:42
Hey Gustavo Barrientos. Mine builds now but crashes when I click the button getting SIGBART – Frankrockz Jul 10 '10 at 15:57
runs on the Simulator? or in the iDevice? try checking the hasTorch. – Gustavo Barrientos Jul 12 '10 at 04:17

iPhone 4's LED Backlight

2 Answers2