Swift version: 5.6
There is one simple property required to enable or disable a device's torch, but you do need to put in some wrapper code to make it work safely. Specifically, you need to use the lockForConfiguration()
and unlockForConfiguration()
methods of the AVCaptureDevice
class in order to make sure only one app can control the torch at a time.
You will need to import the AVFoundation framework, because that's where the AVCaptureDevice
class comes from. Once that's done, add this function to your code and you're good to code:
func toggleTorch(on: Bool) {
guard let device = AVCaptureDevice.default(for: .video) else { return }
if device.hasTorch {
do {
try device.lockForConfiguration()
if on == true {
device.torchMode = .on
} else {
device.torchMode = .off
}
device.unlockForConfiguration()
} catch {
print("Torch could not be used")
}
} else {
print("Torch is not available")
}
}
With that, you can now turn the torch on like this:
toggleTorch(on: true)
SAVE 50% To celebrate WWDC23, all our books and bundles are half price, so you can take your Swift knowledge further without spending big! Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testing skills, and more.
Available from iOS 6.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Link copied to your pasteboard.