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    <p><strong>See a better answer below:</strong> <a href="https://stackoverflow.com/a/10054088/308315">https://stackoverflow.com/a/10054088/308315</a></p> <hr> <p><strong>Old answer:</strong></p> <p>First, in your AppDelegate .h file:</p> <pre><code>#import &lt;AVFoundation/AVFoundation.h&gt; @interface AppDelegate : NSObject &lt;UIApplicationDelegate&gt; { AVCaptureSession *torchSession; } @property (nonatomic, retain) AVCaptureSession * torchSession; @end </code></pre> <p>Then in your AppDelegate .m file:</p> <pre><code>@implementation AppDelegate @synthesize torchSession; - (void)dealloc { [torchSession release]; [super dealloc]; } - (id) init { if ((self = [super init])) { // initialize flashlight // test if this class even exists to ensure flashlight is turned on ONLY for iOS 4 and above Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice"); if (captureDeviceClass != nil) { AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; if ([device hasTorch] &amp;&amp; [device hasFlash]){ if (device.torchMode == AVCaptureTorchModeOff) { NSLog(@"Setting up flashlight for later use..."); AVCaptureDeviceInput *flashInput = [AVCaptureDeviceInput deviceInputWithDevice:device error: nil]; AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init]; AVCaptureSession *session = [[AVCaptureSession alloc] init]; [session beginConfiguration]; [device lockForConfiguration:nil]; [session addInput:flashInput]; [session addOutput:output]; [device unlockForConfiguration]; [output release]; [session commitConfiguration]; [session startRunning]; [self setTorchSession:session]; [session release]; } } } } return self; } </code></pre> <p>Then anytime you want to turn it on, just do something like this:</p> <pre><code>// test if this class even exists to ensure flashlight is turned on ONLY for iOS 4 and above Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice"); if (captureDeviceClass != nil) { AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; [device lockForConfiguration:nil]; [device setTorchMode:AVCaptureTorchModeOn]; [device setFlashMode:AVCaptureFlashModeOn]; [device unlockForConfiguration]; } </code></pre> <p>And similar for turning it off:</p> <pre><code>// test if this class even exists to ensure flashlight is turned on ONLY for iOS 4 and above Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice"); if (captureDeviceClass != nil) { AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; [device lockForConfiguration:nil]; [device setTorchMode:AVCaptureTorchModeOff]; [device setFlashMode:AVCaptureFlashModeOff]; [device unlockForConfiguration]; } </code></pre>
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    1. POTurn on torch/flash on iPhone
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    1. COIn the appdelegate.m file, you should enclose the `init` method's content with something such as: `if ((self = [super init])) { ... } return self;`
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    2. COThis is too combursom and keeping the session consumes battery. Try method below from Tibidabo
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