Swift 3 – 在视图控制器之间传递variables和函数
我目前正在制作一个testing应用程序，您可以使用多路连接来绘制和发送图片。 有一个主机的连接视图控制器和一个单独的其他同行。 当同伴连接时，主机将玩游戏，并且所有同行的视图控制器将会去图纸VCcertificate他们已经连接。 但是，当我想要在graphicsVC中发送数据时，控制台说，即使有连接的对等体，连接的对等体的会话也是0。 我可以testing，因为当断开我在控制台中得到更改状态通知。 那么有人可以告诉我我的代码有什么问题吗？ 谢谢。
Ps我相当新的iOS开发，所以我的代码可能有一些主要问题。
连接pipe理器文件：
import UIKit import MultipeerConnectivity class ConnectionManager: NSObject { var localPeerId = MCPeerID(displayName: UIDevice.current.name) var service = "PI-Connect" var session: MCSession var browser: MCNearbyServiceBrowser var advertiser: MCAdvertiserAssistant var connectionDelegate: ConnectionManagerDelegate? var serviceDelegate: ServiceManagerDelegate? var gameStarted : Bool override init() { self.session = MCSession(peer: self.localPeerId) self.browser = MCNearbyServiceBrowser(peer: self.localPeerId, serviceType: service) self.advertiser = MCAdvertiserAssistant(serviceType: service, discoveryInfo: nil, session: session) gameStarted = false super.init() self.session.delegate = self self.browser.delegate = self self.advertiser.delegate = self } func startBrowsing() { browser.startBrowsingForPeers() } func stopBrowsing() { browser.stopBrowsingForPeers() } func startAdvertising() { advertiser.start() } func stopAdvertising() { advertiser.stop() } func startGame(gameStarted: String) { NSLog("%@", "Start game: \(gameStarted) to \(session.connectedPeers.count) peers") if session.connectedPeers.count > 0 { do { try session.send(gameStarted.data(using: .utf8)!, toPeers: session.connectedPeers, with: .reliable) } catch let error { NSLog("%@", "Error for sending: \(error)") } } } func sendImage(imageData: Data) { displayConnectedPeers() NSLog("%@", "Attempting to send image to \(session.connectedPeers.count) peers") if session.connectedPeers.count > 0 { do { try session.send(imageData, toPeers: session.connectedPeers, with: .reliable) NSLog("%@", "Image sent") } catch let error { NSLog("%@", "Error for sending image: \(error)") } } } func displayConnectedPeers() { NSLog("%@", "Connected peers: \(session.connectedPeers.count)") } } extension ConnectionManager: MCNearbyServiceBrowserDelegate { func browser(_ browser: MCNearbyServiceBrowser, didNotStartBrowsingForPeers error: Error) { NSLog("%@", "didNotStartBrowsingForPeers: \(error)") } func browser(_ browser: MCNearbyServiceBrowser, foundPeer peerID: MCPeerID, withDiscoveryInfo info: [String : String]?) { NSLog("%@", "foundPeer: \(peerID)") NSLog("%@", "invitePeer: \(peerID)") browser.invitePeer(peerID, to: session, withContext: nil, timeout: 10) } func browser(_ browser: MCNearbyServiceBrowser, lostPeer peerID: MCPeerID) { NSLog("%@", "lostPeer: \(peerID)") self.connectionDelegate?.foundHost(manager: self) } } extension ConnectionManager: MCAdvertiserAssistantDelegate { func advertiserAssistantDidDismissInvitation(_ advertiserAssistant: MCAdvertiserAssistant) { NSLog("%@", "Peer dismissed connection") } func advertiserAssistantWillPresentInvitation(_ advertiserAssistant: MCAdvertiserAssistant) { NSLog("%@", "Peer accepted connection") } } extension ConnectionManager: MCSessionDelegate { func session(_ session: MCSession, peer peerID: MCPeerID, didChange state: MCSessionState) { NSLog("%@", "peer \(peerID) didChangeState: \(state)") self.connectionDelegate?.foundHost(manager: self) } func session(_ session: MCSession, didReceive data: Data, fromPeer peerID: MCPeerID) { NSLog("%@", "didReceiveData: \(data)") if gameStarted == false { stopBrowsing() self.connectionDelegate?.hostInitsGame(manager: self) NSLog("%@", "Game Started") gameStarted = true } if gameStarted == true { self.serviceDelegate?.changeImage(manager: self, imageData: data) } } func session(_ session: MCSession, didReceive stream: InputStream, withName streamName: String, fromPeer peerID: MCPeerID) { NSLog("%@", "didReceiveStream") } func session(_ session: MCSession, didStartReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, with progress: Progress) { NSLog("%@", "didStartReceivingResourceWithName") } func session(_ session: MCSession, didFinishReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, at localURL: URL, withError error: Error?) { NSLog("%@", "didFinishReceivingResourceWithName") } } extension browsingForPeers : ConnectionManagerDelegate { func foundHost(manager: ConnectionManager) { OperationQueue.main.addOperation { if self.connectionManager.session.connectedPeers.count > 0 { self.header.text = "\(self.connectionManager.session.connectedPeers[0].displayName)'s game" self.activityMonitor.alpha = 0 } if self.connectionManager.session.connectedPeers.count == 0 { self.header.text = "Searching for game" self.activityMonitor.alpha = 1 } } } func hostInitsGame(manager: ConnectionManager) { OperationQueue.main.addOperation { self.switchViewControllers(active: true) } } } extension ViewController : ServiceManagerDelegate { func changeImage(manager: ConnectionManager, imageData: Data) { self.imageView.image = nil self.imageView.image = UIImage(data: imageData) } } protocol ConnectionManagerDelegate { func hostInitsGame(manager: ConnectionManager) func foundHost(manager: ConnectionManager) } protocol ServiceManagerDelegate { func changeImage(manager: ConnectionManager, imageData: Data) } 浏览器文件
import UIKit class browsingForPeers: UIViewController { let connectionManager = ConnectionManager() @IBOutlet weak var header: UITextField! @IBOutlet weak var activityMonitor: UIActivityIndicatorView! override func viewDidLoad() { super.viewDidLoad() connectionManager.connectionDelegate = self connectionManager.startBrowsing() // Constants().host = false } func switchViewControllers(active: Bool) { if active == true { performSegue(withIdentifier: "browsingToDrawing", sender: self) } } }
search控制器与浏览器相同，只不过是点击播放button而发送数据。
最后是绘图控制器（这是有问题的一个，我删除了所有的绘图代码）
import UIKit import MultipeerConnectivity class ViewController: UIViewController { var globalConstant: Constants? let connectionManager = ConnectionManager() @IBOutlet var imageView: UIImageView! @IBOutlet weak var more: UIButton! @IBOutlet weak var brushOptions: UIButton! @IBOutlet weak var colorOptions: UIButton! @IBOutlet weak var eraser: UIButton! @IBOutlet weak var brushSml: UIButton! @IBOutlet weak var brushMed: UIButton! @IBOutlet weak var brushLrg: UIButton! @IBOutlet weak var redButton: UIButton! @IBOutlet weak var orangeButton: UIButton! @IBOutlet weak var yellowButton: UIButton! @IBOutlet weak var greenButton: UIButton! @IBOutlet weak var lightBlueButton: UIButton! @IBOutlet weak var blueButton: UIButton! @IBOutlet weak var pinkButton: UIButton! @IBOutlet weak var greyButton: UIButton! @IBOutlet weak var blackButton: UIButton! @IBOutlet weak var slider: UISlider! var uiimage: UIImage! var ciimage: CIImage! var data: Data! override var prefersStatusBarHidden: Bool { return true } override func viewDidLoad() { super.viewDidLoad() connectionManager.serviceDelegate = connectionManager.connectionDelegate as! ServiceManagerDelegate? NSLog("%@", "View loaded with \ (connectionManager.session.connectedPeers.count) peers") //Outputs 0 // connectionManager.session.disconnect() // NSLog("%@", "Disconnected") @IBAction func doneButtonClicked(_ sender: UIButton) { imageView.isUserInteractionEnabled = false uiimage = imageView.image if uiimage != nil { data = UIImagePNGRepresentation(uiimage) connectionManager.sendImage(imageData: data) imageView.image = nil imageView.image = UIImage(data: data) } } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } }
对不起，奇怪的格式Xcode副本以一种奇怪的方式不保留切换。 先进的感谢，马特。
当我在不同的类中调用它时，我创build了一个新的类实例。 这就是为什么我所有没有初始化的值都等于零。 这是我固定它的方式…
let connectionManager = ConnectionManager()
这是创build一个实例，而不是一个参考。
至
var connectionManager: ConnectionManager?
这是创build一个已经存在的类的引用。
我不得不做的另一件事是，当我继续到另一个视图控制器，向前传递所有的值。
override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if let destinationViewController = segue.destination as? ViewController { destinationViewController.connectionManager = self.connectionManager } }
我希望这可以帮助任何有这个问题的人。