SWIFT：使用CMDeviceMotion更改视图控制器

我正在关注这篇文章： http ://nshipster.com/cmdevicemotion/关于如何使用CMDeviceMotion。

他们将文章的这一部分命名为“Keep It To Yourself”

我做了一个名为PromptViewController的标识符的viewcontroller。

我得到一个错误：使用未声明的types'PromptViewController'在部分：

if let promptViewController = self?.storyboard?.instantiateViewControllerWithIdentifier("PromptViewController") as? PromptViewController {` 

这是我的完整代码：

 // ViewController.swift // upload_images import UIKit import MapKit import CoreLocation import CoreMotion class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate { @IBOutlet var image: UIImageView! override func viewDidLoad() { super.viewDidLoad() // get magnitude of vector via Pythagorean theorem func magnitudeFromAttitude(attitude: CMAttitude) -> Double { return sqrt(pow(attitude.roll, 2) + pow(attitude.yaw, 2) + pow(attitude.pitch, 2)) } // initial configuration var initialAttitude = manager.deviceMotion!.attitude var showingPrompt = false // trigger values - a gap so there isn't a flicker zone let showPromptTrigger = 1.0 let showAnswerTrigger = 0.8 if manager.deviceMotionAvailable { manager.startDeviceMotionUpdatesToQueue(NSOperationQueue.mainQueue()) { [weak self] (data: CMDeviceMotion?, error: NSError?) in guard let data = data else { return } // translate the attitude data.attitude.multiplyByInverseOfAttitude(initialAttitude) // calculate magnitude of the change from our initial attitude let magnitude = magnitudeFromAttitude(data.attitude) ?? 0 // show the prompt if !showingPrompt && magnitude > showPromptTrigger { if let promptViewController = self?.storyboard?.instantiateViewControllerWithIdentifier("PromptViewController") as? PromptViewController { showingPrompt = true promptViewController.modalTransitionStyle = UIModalTransitionStyle.CrossDissolve self?.presentViewController(promptViewController, animated: true, completion: nil) } } // hide the prompt if showingPrompt && magnitude < showAnswerTrigger { showingPrompt = false self?.dismissViewControllerAnimated(true, completion: nil) } } } } @IBAction func selectPicture(sender: AnyObject) { let ImagePicker = UIImagePickerController() ImagePicker.delegate = self ImagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary self.presentViewController(ImagePicker, animated: true, completion: nil) } func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { image.image = info[UIImagePickerControllerOriginalImage] as? UIImage self.dismissViewControllerAnimated(true, completion: nil) } @IBAction func upload_request(sender: AnyObject) { UploadRequest() } func UploadRequest() { let url = NSURL(string: "http://www.kaleidosblog.com/tutorial/upload.php") let request = NSMutableURLRequest(URL: url!) request.HTTPMethod = "POST" let boundary = generateBoundaryString() request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type") if (image.image == nil) { return } let image_data = UIImagePNGRepresentation(image.image!) if(image_data == nil) { return } let body = NSMutableData() let fname = "test.png" let mimetype = "image/png" body.appendData("--\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!) body.appendData("Content-Disposition:form-data; name=\"test\"\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!) body.appendData("hi\r\n".dataUsingEncoding(NSUTF8StringEncoding)!) body.appendData("--\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!) body.appendData("Content-Disposition:form-data; name=\"file\"; filename=\"\(fname)\"\r\n".dataUsingEncoding(NSUTF8StringEncoding)!) body.appendData("Content-Type: \(mimetype)\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!) body.appendData(image_data!) body.appendData("\r\n".dataUsingEncoding(NSUTF8StringEncoding)!) body.appendData("--\(boundary)--\r\n".dataUsingEncoding(NSUTF8StringEncoding)!) request.HTTPBody = body let session = NSURLSession.sharedSession() let task = session.dataTaskWithRequest(request) { ( let data, let response, let error) in guard let _:NSData = data, let _:NSURLResponse = response where error == nil else { print("error") return } let dataString = NSString(data: data!, encoding: NSUTF8StringEncoding) print(dataString) } task.resume() } func generateBoundaryString() -> String { return "Boundary-\(NSUUID().UUIDString)" } 

这里是我的代码错误的图像：

我的代码的图像

你知道我怎么能解决这个问题吗？

谢谢！