How to turn the iPhone camera flash on/off?

Question

How can I turn the iPhone's LED camera flash on/off programatically?

Answer 1

#import <AVFoundation/AVFoundation.h> 

...

- (void) turnTorchOn: (bool) on {      // check if flashlight available     Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice");     if (captureDeviceClass != nil) {         AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];         if ([device hasTorch] && [device hasFlash]){              [device lockForConfiguration:nil];             if (on) {                 [device setTorchMode:AVCaptureTorchModeOn];                 [device setFlashMode:AVCaptureFlashModeOn];                 //torchIsOn = YES; //define as a variable/property if you need to know status              } else {                 [device setTorchMode:AVCaptureTorchModeOff];                 [device setFlashMode:AVCaptureFlashModeOff];                 //torchIsOn = NO;                         }             [device unlockForConfiguration];         }     } } 

Answer 2

I combined the timer with the above code.it worked for me...

 - (void)viewDidLoad         {          [super viewDidLoad];           myTimer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self                    selector:@selector(toggleFlashlight) userInfo:nil repeats:YES];         // Do any additional setup after loading the view from its nib.         }        - (void) toggleFlashlight        {      // check if flashlight available     Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice");     if (captureDeviceClass != nil) {         AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];         if ([device hasTorch] && [device hasFlash]){              [device lockForConfiguration:nil];             if (device.torchMode == AVCaptureTorchModeOff)              {                 [device setTorchMode:AVCaptureTorchModeOn];                 [device setFlashMode:AVCaptureFlashModeOn];                 //torchIsOn = YES;             }             else              {                 [device setTorchMode:AVCaptureTorchModeOff];                 [device setFlashMode:AVCaptureFlashModeOff];                // torchIsOn = NO;                         }             [device unlockForConfiguration];         }     } }