【发布时间】：2017-07-23 21:18:20
【问题描述】：
我刚刚解决了这个问题。感谢一些出色的帮助让我走上正轨。 这是我现在的代码。
基本上，我现在可以从绘制的叠加层和 cameraPreview 中制作图像。但还不能将它们结合起来。我能找到的有用代码似乎很少。
所以重要的部分是顶部的扩展块，以及添加到 func saveToCamera() 靠近代码底部。 简而言之，我想我现在有了我需要的两张图片。 myImage 的快照出现在白色背景上 - 所以不确定这是否自然 - 或不是。这就是它在模拟器上的显示方式。所以这可能只是自然的。
import UIKit
import AVFoundation
import Foundation
// extension must be outside class
extension UIImage {
convenience init(view: UIView) {
UIGraphicsBeginImageContext(view.frame.size)
view.layer.render(in: UIGraphicsGetCurrentContext()!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
self.init(cgImage: (image?.cgImage)!)
}
}
class ViewController: UIViewController {
@IBOutlet weak var navigationBar: UINavigationBar!
@IBOutlet weak var imgOverlay: UIImageView!
@IBOutlet weak var btnCapture: UIButton!
@IBOutlet weak var shapeLayer: UIView!
let captureSession = AVCaptureSession()
let stillImageOutput = AVCaptureStillImageOutput()
var previewLayer : AVCaptureVideoPreviewLayer?
//var shapeLayer : CALayer?
// If we find a device we'll store it here for later use
var captureDevice : AVCaptureDevice?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
//=======================
let midX = self.view.bounds.midX
let midY = self.view.bounds.midY
for index in 1...10 {
let circlePath = UIBezierPath(arcCenter: CGPoint(x: midX,y: midY), radius: CGFloat((index * 10)), startAngle: CGFloat(0), endAngle:CGFloat(M_PI * 2), clockwise: true)
let shapeLayerPath = CAShapeLayer()
shapeLayerPath.path = circlePath.cgPath
//change the fill color
shapeLayerPath.fillColor = UIColor.clear.cgColor
//you can change the stroke color
shapeLayerPath.strokeColor = UIColor.blue.cgColor
//you can change the line width
shapeLayerPath.lineWidth = 0.5
// add the blue-circle layer to the shapeLayer ImageView
shapeLayer.layer.addSublayer(shapeLayerPath)
}
print("Shape layer drawn")
//=====================
captureSession.sessionPreset = AVCaptureSessionPresetHigh
if let devices = AVCaptureDevice.devices() as? [AVCaptureDevice] {
// Loop through all the capture devices on this phone
for device in devices {
// Make sure this particular device supports video
if (device.hasMediaType(AVMediaTypeVideo)) {
// Finally check the position and confirm we've got the back camera
if(device.position == AVCaptureDevicePosition.back) {
captureDevice = device
if captureDevice != nil {
print("Capture device found")
beginSession()
}
}
}
}
}
}
@IBAction func actionCameraCapture(_ sender: AnyObject) {
print("Camera button pressed")
saveToCamera()
}
func beginSession() {
do {
try captureSession.addInput(AVCaptureDeviceInput(device: captureDevice))
stillImageOutput.outputSettings = [AVVideoCodecKey:AVVideoCodecJPEG]
if captureSession.canAddOutput(stillImageOutput) {
captureSession.addOutput(stillImageOutput)
}
}
catch {
print("error: \(error.localizedDescription)")
}
guard let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession) else {
print("no preview layer")
return
}
// this is what displays the camera view. But - it's on TOP of the drawn view, and under the overview. ??
self.view.layer.addSublayer(previewLayer)
previewLayer.frame = self.view.layer.frame
captureSession.startRunning()
print("Capture session running")
self.view.addSubview(navigationBar)
//self.view.addSubview(imgOverlay)
self.view.addSubview(btnCapture)
// shapeLayer ImageView is already a subview created in IB
// but this will bring it to the front
self.view.addSubview(shapeLayer)
}
func saveToCamera() {
if let videoConnection = stillImageOutput.connection(withMediaType: AVMediaTypeVideo) {
stillImageOutput.captureStillImageAsynchronously(from: videoConnection, completionHandler: { (CMSampleBuffer, Error) in
if let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(CMSampleBuffer) {
if let cameraImage = UIImage(data: imageData) {
// cameraImage is the camera preview image.
// I need to combine/merge it with the myImage that is actually the blue circles.
// This converts the UIView of the bllue circles to an image. Uses 'extension' at top of code.
let myImage = UIImage(view: self.shapeLayer)
print("converting myImage to an image")
UIImageWriteToSavedPhotosAlbum(cameraImage, nil, nil, nil)
}
}
})
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
【问题讨论】：
标签： ios swift3 camera-overlay