1
我正在尝试制作使用相机的应用程序,但使用下面的代码,它只显示一个白色屏幕。当应用程序打开时,相机应该出现。自定义相机,白屏//快速3
import UIKit
import AVFoundation
import Foundation
@IBOutlet var cameraView: UIView!
var captureSession : AVCaptureSession?
var stillImageOutput : AVCaptureStillImageOutput?
var previewLayer : AVCaptureVideoPreviewLayer?
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
captureSession = AVCaptureSession()
captureSession?.sessionPreset = AVCaptureSessionPreset1920x1080
let backCamera = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
do {
let input = try! AVCaptureDeviceInput (device: backCamera)
if (captureSession?.canAddInput(input) != nil) {
captureSession?.addInput(input)
stillImageOutput = AVCaptureStillImageOutput()
stillImageOutput?.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
if (captureSession?.canAddOutput(stillImageOutput) != nil) {
captureSession?.addOutput(stillImageOutput)
previewLayer = AVCaptureVideoPreviewLayer (session: captureSession)
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspect
previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portrait
cameraView.layer.addSublayer(previewLayer!)
captureSession?.startRunning()
}
}
} catch {
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
previewLayer?.frame = cameraView.bounds
}
使用此代码,我看到的只是一个白色屏幕而不是正在使用的相机。谢谢。