How to turn flashlight ON and OFF in swift?
Update #1: (torchActive
isn't returning the expected value; perhaps because it's been modified)
Update #2: For Swift 2.0
To toggle the flash from on to off (not just "on" as in mad pig's answer), you can use the following method:
func toggleFlash() {
let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
if (device.hasTorch) {
do {
try device.lockForConfiguration()
if (device.torchMode == AVCaptureTorchMode.On) {
device.torchMode = AVCaptureTorchMode.Off
} else {
do {
try device.setTorchModeOnWithLevel(1.0)
} catch {
print(error)
}
}
device.unlockForConfiguration()
} catch {
print(error)
}
}
}
I used nested do-catch blocks to implement Awesomeness's suggestion from the comments. This way, even if try device.setTorchModeOnWithLevel(1.0)
fails, the device is properly unlocked for configuration.
Update #3: For Swift 4:
(I edited the code a bit to my personal taste)
func toggleFlash() {
guard let device = AVCaptureDevice.default(for: AVMediaType.video) else { return }
guard device.hasTorch else { return }
do {
try device.lockForConfiguration()
if (device.torchMode == AVCaptureDevice.TorchMode.on) {
device.torchMode = AVCaptureDevice.TorchMode.off
} else {
do {
try device.setTorchModeOn(level: 1.0)
} catch {
print(error)
}
}
device.unlockForConfiguration()
} catch {
print(error)
}
}
Original answer:
To toggle the flash from on to off (not just "on" as in mad pig's answer), you can use the following method:
func toggleFlash() {
let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
if (device.hasTorch) {
device.lockForConfiguration(nil)
let torchOn = !device.torchActive
device.setTorchModeOnWithLevel(1.0, error: nil)
device.torchMode = torchOn ? AVCaptureTorchMode.On : AVCaptureTorchMode.Off
device.unlockForConfiguration()
}
}
Updated Swift 4 Answer:
func toggleTorch(on: Bool) {
guard
let device = AVCaptureDevice.default(for: AVMediaType.video),
device.hasTorch
else { return }
do {
try device.lockForConfiguration()
device.torchMode = on ? .on : .off
device.unlockForConfiguration()
} catch {
print("Torch could not be used")
}
}
Then to actually turn it on or off, call the function and pass in a true or false boolean.
toggleTorch(on: true)
of toggleTorch(on: false)
I got this answer from Hacking with Swift, however their example had an error in it.
They used AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
but this produces an error saying defaultDevice
doesn't exist. So I changed it to AVCaptureDevice.default(for: AVMediaType.video)