ios - 无法通过多点连接连接蓝牙

Question

swift 3.0

我可以使用多点连接通过 Wifi 在 iPhone 之间共享数据，但不能通过蓝牙共享数据，而且在我看来 Wifi 不稳定。
Wifi 将连接一半的时间，而蓝牙将看到对等点但不会连接。
将 iPhone 与 iPhone 以及 iPhone 与本地任何其他类型手机连接的最佳方式是什么。一个例子是没有互联网或没有 Wifi。
我最终还将向服务器发送数据，并从该服务器接收数据。

这会给我 3 个连接选择:

1.私有(private)使用(蓝牙)？并肩站立
2.半私有(private)使用(Wifi)办公室到办公室
3.全局公众使用(互联网)

蓝牙连接时此代码是否错误？

import UIKit
import MultipeerConnectivity



class ViewController: UIViewController, MCSessionDelegate, MCBrowserViewControllerDelegate,  UINavigationControllerDelegate , UIImagePickerControllerDelegate{



//MARK: - Variables
var myDictionary:NSDictionary = [:]

//Variables for Peer to Peer.
var browser   : MCBrowserViewController!
var assistant : MCAdvertiserAssistant!
var session   : MCSession!
var peerID    : MCPeerID!

//Variables for Peer to Peer.
let imagePicker  = UIImagePickerController()
var imageDataVar: NSData!



//MARK: - Labels
@IBOutlet weak var firstNameLabel: UILabel!
@IBOutlet weak var lastNameLabel:  UILabel!

//MARK: - TextFields
@IBOutlet weak var fistNameTextField: UITextField!
@IBOutlet weak var lastNameTextField: UITextField!

//MARK: - Outlets

@IBOutlet weak var contactImageView: UIImageView!

//MARK: - Buttons
@IBAction func openPortButton(_ sender: AnyObject) {
    self.present(self.browser, animated: true, completion: nil)
}

@IBAction func sendButton(_ sender: AnyObject) {
    sendInfo()
}

@IBAction func getImage(_ sender: AnyObject) {
    chooseImageContact()
}



//MARK: - ViewDidLoad
override func viewDidLoad() {
    super.viewDidLoad()
    loadPeerToPeer()
}


//MARK: - Functions
func sendInfo() {
    if self.session.connectedPeers.count > 0 {
        let firstNameVar = fistNameTextField.text!
        let lastNameVar = lastNameTextField.text!
            myDictionary = ["itemA" : "\(firstNameVar)", "itemB" : "\(lastNameVar)", "itemC" : imageDataVar]
        do {
            let data =  NSKeyedArchiver.archivedData(withRootObject: myDictionary)
            try self.session.send(data, toPeers: self.session.connectedPeers, with: MCSessionSendDataMode.unreliable)
        } catch let error as NSError {
            let ac = UIAlertController(title: "Send error", message: error.localizedDescription, preferredStyle: .alert)
            ac.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
            present(ac, animated: true, completion: nil)
        }
    }
}


// Called when a peer sends an NSData to us
func session(_ session: MCSession, didReceive data: Data, fromPeer peerID: MCPeerID) {

    // This needs to run on the main queue
    DispatchQueue.main.async {
        self.myDictionary = NSKeyedUnarchiver.unarchiveObject(with: data) as! NSDictionary

        self.firstNameLabel.text    = self.myDictionary.value(forKey: "itemA") as? String
        self.lastNameLabel.text     = self.myDictionary.value(forKey: "itemB") as? String
        let image                   = self.myDictionary.value(forKey: "itemC") as? NSData
        let newContactImage:UIImage = UIImage(data: image! as Data)!
        let smallPicture            = self.scaleContactImageWith(newContactImage, newSize: CGSize(width: 100, height: 100))
        var sizeOfImage:CGRect      = self.contactImageView.frame
            sizeOfImage.size        = smallPicture.size
        self.contactImageView.frame = sizeOfImage
        self.contactImageView.image = smallPicture
    }
}


func browserViewControllerDidFinish(_ browserViewController: MCBrowserViewController) {
    dismiss(animated: true, completion: nil)
}
func browserViewControllerWasCancelled(_ browserViewController: MCBrowserViewController) {
    dismiss(animated: true, completion: nil)
}
func browserViewController(_ browserViewController: MCBrowserViewController, shouldPresentNearbyPeer peerID: MCPeerID, withDiscoveryInfo info: [String : String]?) -> Bool {
    return true
}

func session(_ session: MCSession, peer peerID: MCPeerID, didChange state: MCSessionState) {
    switch state {
    case MCSessionState.connected:
        print("Connected: \(peerID.displayName)")
    case MCSessionState.connecting:
        print("Connecting: \(peerID.displayName)")
    case MCSessionState.notConnected:
        print("Not Connected: \(peerID.displayName)")
    }
}

func session(_ session: MCSession, didStartReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, with progress: Progress) {
}
func session(_ session: MCSession, didFinishReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, at localURL: URL, withError error: Error?) {
}
func session(_ session: MCSession, didReceive stream: InputStream, withName streamName: String, fromPeer peerID: MCPeerID) {
}

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    textField.resignFirstResponder()
    return true
}



func loadPeerToPeer(){
    self.peerID  = MCPeerID(displayName: UIDevice.current.name)
    self.session = MCSession(peer: peerID, securityIdentity: nil, encryptionPreference: .required)
    self.session = MCSession(peer: self.peerID)
    self.session.delegate = self
    self.assistant = MCAdvertiserAssistant(serviceType:"VBC-ShareCard", discoveryInfo:nil, session:self.session)
    self.assistant.start()
    self.browser = MCBrowserViewController(serviceType: "VBC-ShareCard", session: self.session)
    self.browser.delegate = self
}

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    picker.dismiss(animated: true, completion: nil)
}


// Picking the image
func chooseImageContact(){
    let imagePicker            = UIImagePickerController()
        imagePicker.delegate   = self
        imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
    self.present(imagePicker, animated: true, completion: nil)
}


//Scalling the image
func scaleContactImageWith(_ image:UIImage, newSize:CGSize)->UIImage{
        UIGraphicsBeginImageContextWithOptions(newSize, false, 0.0)
        image.draw(in: CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height))
    let newContactImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
    return newContactImage
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

    //This gets the Contact image inside the imagePickerController
    let pickedImage:UIImage     = info[UIImagePickerControllerOriginalImage] as! UIImage
    let smallPicture            = scaleContactImageWith(pickedImage, newSize: CGSize(width: 100, height: 100))
    var sizeOfImage:CGRect      = contactImageView.frame
        sizeOfImage.size        = smallPicture.size
        contactImageView.frame  = sizeOfImage
        picker.dismiss(animated: true, completion: nil)
        contactImageView.image  = smallPicture as UIImage
    let test : Data             = UIImagePNGRepresentation(smallPicture)!
        imageDataVar            = test as NSData!
}

}

Answer 1

蓝牙问题出现在蓝牙连接测试中，而不是代码中。 我发现在 Swift 3.0(我正在运行)中，您无法关闭 Wifi 并进行测试，您必须进入“设置”> Wi-Fi，然后选择您连接的 Wi-Fi/网络。然后选择忘记此网络。

即使您现在没有 Wi-Fi/网络，也必须打开 WiFi 本身和蓝牙。