用什么代码（在斯威夫特！）你打开/closuresiPhone的LED（闪光灯）？

我可以使用哪个代码来使用一个button打开/closuresiPhone（在Swift中）。

我是否使用Outlet或Action进行连接？

我会感谢所有的帮助！

Answer 1

Xcode 9 beta•Swift 4

import AVFoundation extension AVCaptureDevice { var isLocked: Bool { do { try lockForConfiguration() return true } catch { print(error) return false } } func setTorch(intensity: Float) { guard hasTorch && isLocked else { return } defer { unlockForConfiguration() } if intensity > 0 { if torchMode == .off { torchMode = .on } do { try setTorchModeOn(level: intensity) } catch { print(error) } } else { torchMode = .off } } } 

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用法：

 import UIKit import AVFoundation class ViewController: UIViewController { var device: AVCaptureDevice! override func viewDidLoad() { super.viewDidLoad() device = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .unspecified) } @IBAction func slider(_ sender: UISlider) { device.setTorch(intensity: sender.value) } } 

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Xcode 8.2.1•Swift 3.0.2

 extension AVCaptureDevice { @discardableResult class func toggleTorch() -> Bool { guard let defaultDevice = AVCaptureDevice.defaultDevice(withDeviceType: .builtInWideAngleCamera, mediaType: AVMediaTypeVideo, position: .unspecified) else { print("early exit") return false } // Check if the default device has torch if defaultDevice.hasTorch { print("defaultDevice.hasTorch:", defaultDevice.hasTorch) // Lock your default device for configuration do { // unlock your device when done defer { defaultDevice.unlockForConfiguration() print("defaultDevice.unlockedForConfiguration:", true) } try defaultDevice.lockForConfiguration() print("defaultDevice.lockedForConfiguration:", true) // Toggles the torchMode defaultDevice.torchMode = defaultDevice.torchMode == .on ? .off : .on // Sets the torch intensity to 100% if torchMode is ON if defaultDevice.torchMode == .on { do { try defaultDevice.setTorchModeOnWithLevel(1) } catch { print(error.localizedDescription) } } } catch { print(error.localizedDescription) } } print("defaultDevice.torchMode:", defaultDevice.torchMode == .on) return defaultDevice.torchMode == .on } } 

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 class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(tap(_:)))) } func tap(_ gesture: UITapGestureRecognizer) { if AVCaptureDevice.toggleTorch() { print("TORCH IS ON") } else { print("TORCH IS OFF") } } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } }