不能把这一个出来.
当应用程序处于活动状态时,一切都可以正常运行,而有时当我将应用程序移动到背景(按住主页按钮)而不是返回时,预览屏幕冻结/卡住.
我使用viewWillAppear和viewDidAppear进行设置.
这是我如何设置一切：
当应用程序处于活动状态时,一切都可以正常运行,而有时当我将应用程序移动到背景(按住主页按钮)而不是返回时,预览屏幕冻结/卡住.
我使用viewWillAppear和viewDidAppear进行设置.
这是我如何设置一切：
var backCamera = AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo)
var global_device : AVCaptureDevice!
var captureSession: AVCaptureSession?
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
captureSession = AVCaptureSession()
captureSession!.sessionPreset = AVCaptureSessionPresetPhoto
CorrectPosition = AVCaptureDevicePosition.Back
for device in backCamera {
if device.position == AVCaptureDevicePosition.Back {
global_device = device as! AVCaptureDevice
CorrectPosition = AVCaptureDevicePosition.Back
break
}
}
configureCamera()
var error: NSError?
var input = AVCaptureDeviceInput(device: global_device,error: &error)
if error == nil && captureSession!.canAddInput(input) {
captureSession!.addInput(input)
stillImageOutput = AVCaptureStillImageOutput()
stillImageOutput!.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
if captureSession!.canAddOutput(stillImageOutput) {
captureSession!.addOutput(stillImageOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
var bounds:CGRect = camera_Preview.layer.bounds
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
previewLayer?.bounds = bounds
previewLayer?.position = CGPointMake(CGRectGetMidX(bounds),CGRectGetMidY(bounds))
camera_Preview.layer.addSublayer(previewLayer)
self.view.bringSubviewToFront(camera_Preview)
self.view.bringSubviewToFront(nan_view)
captureSession!.startRunning()
}
}
ViewDidAppear：
var previewLayer: AVCaptureVideoPreviewLayer?
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
previewLayer!.frame = camera_Preview.bounds
}
