我试图在单个用户单击“相机预览”后拍摄几张照片,以便我可以呈现它们,并且用户可以选择最合适的时间或在“胶片”模式下全部使用。预期的用户体验是:“我打开相机,拍照,然后每秒看到5张照片。我不必按5次“拍照”按钮,一个就足以开始序列了。 。
我是iOS和Swift的新手,我的工作基于一本“Swift Recipes”书(https://www.safaribooksonline.com/library/view/ios-8-swift/9781491908969/)。
拍摄单张照片的源代码是:
controller = UIImagePickerController()
if let theController = controller{
theController.sourceType = .Camera
theController.mediaTypes = [kUTTypeImage as NSString]
theController.allowsEditing = true
theController.delegate = self
presentViewController(theController, animated: true, completion: nil)
}
加上相关的图像处理(通过func imagePickerController)。我尝试使用上面的 Controller objecct进行操作,但不幸失败了:(我相信这不是获得我想要的东西的正确方法,但是我很难找到合适的方法。任何帮助将不胜感激。
最佳答案
我不知道UIImagePickerController
中是否存在这种行为的模式。如果我是你,我将使用AVFoundation来实现这一点。
import UIKit
import AVFoundation
class ViewController: UIViewController {
var connection: AVCaptureConnection!
var output: AVCaptureStillImageOutput!
var videoPreviewLayer: AVCaptureVideoPreviewLayer!
@IBOutlet var videPreviewView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
self.createCamera()
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
self.videoPreviewLayer.bounds = self.videPreviewView.bounds
self.videoPreviewLayer.position = CGPoint(x: CGRectGetMidX(self.videPreviewView.bounds), y: CGRectGetMidY(self.videPreviewView.bounds))
}
func createCamera() {
let captureSession = AVCaptureSession()
if captureSession.canSetSessionPreset(AVCaptureSessionPresetHigh) {
captureSession.sessionPreset = AVCaptureSessionPresetHigh
} else {
println("Error: Couldn't set preset = \(AVCaptureSessionPresetHigh)")
return
}
let cameraDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
var error: NSError?
let inputDevice = AVCaptureDeviceInput.deviceInputWithDevice(cameraDevice, error: &error) as AVCaptureDeviceInput
if let error = error {
println("Error: \(error)")
return
}
if captureSession.canAddInput(inputDevice) {
captureSession.addInput(inputDevice)
} else {
println("Error: Couldn't add input device")
return
}
let imageOutput = AVCaptureStillImageOutput()
if captureSession.canAddOutput(imageOutput) {
captureSession.addOutput(imageOutput)
} else {
println("Error: Couldn't add output")
return
}
// Store imageOutput. We will need it to take photo
self.output = imageOutput
let connection = imageOutput.connections.first as AVCaptureConnection!
// Store this connection in property. We will need it when we take image.
self.connection = connection
connection.videoOrientation = AVCaptureVideoOrientation.Portrait
captureSession.startRunning()
// This will preview the camera
let videoLayer = AVCaptureVideoPreviewLayer(session: captureSession)
videoLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
videoLayer.contentsScale = UIScreen.mainScreen().scale
self.videPreviewView.layer.addSublayer(videoLayer)
// Store this layer instance in property. We will place it into a view
self.videoPreviewLayer = videoLayer
}
func takePhoto(completion: (UIImage?, NSError?) -> Void) {
self.output.captureStillImageAsynchronouslyFromConnection(self.connection) { buffer, error in
if let error = error {
completion(nil, error)
} else {
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(buffer)
let image = UIImage(data: imageData, scale: UIScreen.mainScreen().scale)
completion(image, nil)
}
}
}
}
现在,您要做的就是创建一个操作,该操作将调用
takePhoto
3次。您可以使用NSTimer
来执行此操作。