In the last update notes for the Swift Playground app for the iPad I saw that the cameras would be accessible through the playgrounds. For testing purpose I've therefore created a playground to access my iPads back camera. As reference I've used those sources:
- https://github.com/codepath/ios_guides/wiki/Creating-a-Custom-Camera-View
- https://github.com/francip/swift-playground-camera/blob/master/Camera.playground/Contents.swift
Here is my code:
import UIKit
import AVFoundation
import PlaygroundSupport
class MainViewController : UIViewController {
private var _session: AVCaptureSession?
private var _captureInput: AVCaptureInput?
private var _stillImageOutput: AVCaptureStillImageOutput?
private var _frontCamera: AVCaptureDevice?
private var _previewView: UIView?
private var _previewLayer: AVCaptureVideoPreviewLayer?
public override func loadView() {
print("loadView()")
_previewView = UIView()
guard let view = _previewView else {
printError(errMsg: "View could not be created!")
return
}
view.backgroundColor = UIColor.brown
self.view = view
}
public override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Create a capture session
_session = AVCaptureSession()
guard let session = _session else {
printError(errMsg: "Session is empty!")
return
}
session.beginConfiguration()
session.sessionPreset = AVCaptureSession.Preset.photo
// Get access to front camera
_frontCamera = AVCaptureDevice.default(for: AVMediaType.video)
guard let frontCamera = _frontCamera
else {
printError(errMsg: "Front camera not accessible!")
return
}
do{
_captureInput = try AVCaptureDeviceInput(device: frontCamera)
} catch let err as NSError {
printError(errMsg: err.localizedDescription)
return
}
// Add input to session
guard let captureInput = _captureInput else {
printError(errMsg: "Capture input not available!")
return
}
if session.canAddInput(captureInput){
session.addInput(captureInput)
}
// Configurw the image output
_stillImageOutput = AVCaptureStillImageOutput()
guard let sillImageOutput = _stillImageOutput else {
printError(errMsg: "Image output not available!")
return
}
sillImageOutput.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
if session.canAddOutput(sillImageOutput) {
session.addOutput(sillImageOutput)
}
session.commitConfiguration()
// Add video preview layer
_previewLayer = AVCaptureVideoPreviewLayer(session: session)
guard let previewLayer = _previewLayer else {
printError(errMsg: "Preview layer not available!")
return
}
previewLayer.videoGravity = AVLayerVideoGravity.resizeAspect
previewLayer.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
guard let view = _previewView else {
printError(errMsg: "View not available!")
return
}
view.layer.addSublayer(previewLayer)
view.layer.borderWidth = 5
// Start the capture session
session.startRunning()
}
public override func viewDidLoad() {
super.viewDidLoad()
}
public override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
guard let previewLayer = _previewLayer else {
printError(errMsg: "Preview layer not available!")
return
}
guard let previewView = _previewView else {
printError(errMsg: "View not available!")
return
}
print(previewView.bounds)
previewLayer.frame = previewView.bounds
}
private func printError(errMsg: String) {
print("[Error]: " + errMsg)
}
}
PlaygroundPage.current.liveView = MainViewController()
Please ignore the private variables for the session, etc. I know that I can/should make them method local.
The only thing I see is the brown background of the view.
When running the app for the first time iOS asked me if the Playgrounds app should have access to the camera which I accepted. In the settings I can also see that the app has access to the camera.
iOS Version: 10.3.3 Playground App: 1.6.1
