How can I determine whether my iOS device has a torch light?

Question

In my application I have the option for a torch light. Howevver, only iPhone 4 and iPhone 4S have torch lights. Other devices do not have the torch light. How can I find the current device model? Please help me. Thanks in advance.

score 4 · Answer 1 · answered Jun 12 '14 at 12:23

You can have less code and use less memory than the code above:

NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
BOOL hasTorch = NO;

for (AVCaptureDevice *device in devices) {
    if ([device hasTorch]) {
        hasTorch = YES;
        break;
    }
}

hasTorch will now contains the correct value

score 4 · Accepted Answer · answered Dec 07 '11 at 16:06

You should not use the device model as an indicator of whether a feature is present. Instead, use the API that tells you exactly if the feature is present.

In your case, you want to use AVCaptureDevice's -hasTorch property:

NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
NSMutableArray *torchDevices = [[NSMutableArray alloc] init];
BOOL hasTorch = NO;

for (AVCaptureDevice *device in devices) {
    if ([device hasTorch]) {
        [torchDevices addObject:device];
    }
}

hasTorch = ([torchDevices count] > 0);

More information is available in the AV Foundation Programming Guide and the AVCaptureDevice Class Reference

Thank you Mr.Martin Gordon. Your answer working very perfect. Thanks a lot. — Yuvaraj.M, Dec 07 '11 at 16:20

Jess · Answer 3 · 2019-11-07T08:19:13.793

3

Swift 4

var deviceHasTorch: Bool {
    return AVCaptureDevice.default(for: AVMediaType.video)?.hasTorch == true
}

edited Nov 07 '19 at 08:19

answered Dec 10 '18 at 09:57

Jess

1,394
12
12

This is the correct answer. The torch is always attached to the default video capture device, if present. – Simon Tillson Aug 03 '20 at 14:18

score 1 · Answer 4 · answered Jul 02 '15 at 04:38

This code will give your device the ability to turn on the flashlight. But it will also detect if the flashlight is on or off and do the opposite.

- (void)torchOnOff: (BOOL) onOff {

AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if ([device hasTorch]) {
    [device lockForConfiguration:nil];
    if (device.torchMode == AVCaptureTorchModeOff) {
        device.torchMode = AVCaptureTorchModeOn;
        NSLog(@"Torch mode is on.");
    } else {
        device.torchMode = AVCaptureTorchModeOff;
        NSLog(@"Torch mode is off.");
    }
    [device unlockForConfiguration];
}

}

M-P · Answer 5 · 2017-11-03T00:50:13.613

0

Swift 4

if let device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo) {
    if (device.hasTorch) {
        // Device has torch
    } else {
        // Device does not have torch
    }
} else {
    // Device does not support video type (and so, no torch)
}

edited Nov 03 '17 at 00:50

answered Nov 03 '17 at 00:43

M-P

4,909
3
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score 0 · Answer 6 · answered Apr 24 '18 at 16:09

devicesWithMediaType: is now deprecated.

Swift 4:

let discoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInWideAngleCamera], mediaType: .video, position: .back)

for device in discoverySession.devices {
    if device.hasTorch {
        return true
    }
}

return false

How can I determine whether my iOS device has a torch light?

6 Answers6

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