在Swift中使用按钮切换相机 [英] Switching Camera with a button in Swift
本文介绍了在Swift中使用按钮切换相机的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
这似乎可以将相机从后向前切换,但是我正在尝试提出一个'if'语句,以便我也可以将其切换回去.有任何想法或建议吗?
This seems to work to switch the camera from the back to the front, but I'm trying to come up with an 'if' statement so that I can switch it back too. Any ideas or advice?
@IBAction func didTouchSwitchButton(sender: UIButton) {
let camera = getDevice(.Front)
let cameraBack = getDevice(.Back)
do {
input = try AVCaptureDeviceInput(device: camera)
} catch let error as NSError {
print(error)
input = nil
}
if(captureSession?.canAddInput(input) == true){
captureSession?.addInput(input)
stillImageOutput?.outputSettings = [AVVideoCodecKey : AVVideoCodecJPEG]
if(captureSession?.canAddOutput(stillImageOutput) == true){
captureSession?.addOutput(stillImageOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer?.frame = cameraView.bounds
cameraView.layer.addSublayer(previewLayer!)
captureSession?.startRunning()
}
}
}
推荐答案
func switchCamera(_ sender: UIButton) {
if let session = AVCaptureSession() {
let currentCameraInput: AVCaptureInput = session.inputs[0]
session.removeInput(currentCameraInput)
var newCamera: AVCaptureDevice
newCamera = AVCaptureDevice.default(for: AVMediaType.video)!
if (currentCameraInput as! AVCaptureDeviceInput).device.position == .back {
UIView.transition(with: self.cameraView, duration: 0.5, options: .transitionFlipFromLeft, animations: {
newCamera = self.cameraWithPosition(.front)!
}, completion: nil)
} else {
UIView.transition(with: self.cameraView, duration: 0.5, options: .transitionFlipFromRight, animations: {
newCamera = self.cameraWithPosition(.back)!
}, completion: nil)
}
do {
try self.captureSession?.addInput(AVCaptureDeviceInput(device: newCamera))
}
catch {
print("error: \(error.localizedDescription)")
}
}
}
func cameraWithPosition(_ position: AVCaptureDevice.Position) -> AVCaptureDevice? {
let deviceDescoverySession = AVCaptureDevice.DiscoverySession.init(deviceTypes: [AVCaptureDevice.DeviceType.builtInWideAngleCamera], mediaType: AVMediaType.video, position: AVCaptureDevice.Position.unspecified)
for device in deviceDescoverySession.devices {
if device.position == position {
return device
}
}
return nil
}
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