我使用这个代码在我的iOS 9,斯威夫特显示手机相机:AVCaptureVideoPreviewLayer看起来是iPhone 4的尺寸
属性:
@IBOutlet weak var previewView: UIView!
var session: AVCaptureSession!
var input: AVCaptureDeviceInput!
var output: AVCaptureStillImageOutput!
var previewLayer: AVCaptureVideoPreviewLayer?
委托方法:
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
setupSession()
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
// Experimental/debugging
view.layoutSubviews()
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
// Experimental/debugging
previewLayer!.frame = previewView.bounds
}
相机方法:
func setupSession() {
session = AVCaptureSession()
session.sessionPreset = AVCaptureSessionPresetPhoto
let camera = frontCamera()
do { input = try AVCaptureDeviceInput(device: camera) } catch { return }
output = AVCaptureStillImageOutput()
output.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
guard session.canAddInput(input) && session.canAddOutput(output) else { return }
session.addInput(input)
session.addOutput(output)
previewLayer = AVCaptureVideoPreviewLayer(session: session)
previewLayer!.videoGravity = AVLayerVideoGravityResizeAspect
previewLayer!.frame = previewView.bounds
previewLayer!.connection?.videoOrientation = .Portrait
previewView.layer.addSublayer(previewLayer!)
session.startRunning()
}
func frontCamera() -> AVCaptureDevice! {
let devices = AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo)
for device in devices {
if (device.position == AVCaptureDevicePosition.Front) {
return device as! AVCaptureDevice
}
}
return nil
}
然而,相机显示如下:
,它似乎是等同于iPhone 4
我怎样才能解决这个问题的显示尺寸?我试过在viewDidLayoutSubviews
中设置框架,但我无法正确设置它的大小。
数3解决它,显然的最后四个字符 “填充” 并获得成功。谢谢! – Erik