Bonjour 是什么？

bonjour其實(shí)來(lái)自法語(yǔ)，是你好的意思。而B(niǎo)onjour服務(wù)是蘋(píng)果公司發(fā)布的一個(gè)基于ZEROCONF工作組(IETF下屬小組)的工作,用于實(shí)現(xiàn)零配置網(wǎng)絡(luò)聯(lián)網(wǎng)的解決方案。Bonjour是基于IP層協(xié)議的,簡(jiǎn)單來(lái)說(shuō),就是一套解決方案,能夠不需要復(fù)雜的配置,即可互相發(fā)現(xiàn)彼此的解決方案?？梢杂盟鼇?lái)輕松探測(cè)并連接到相同網(wǎng)絡(luò)中的其他設(shè)備，并與別的智能硬件進(jìn)行交互或者其他操作。典型的Bonjour應(yīng)用有Remote、AirPrint等。(本段摘自Bonjour的使用-本地通信/智能交互)

如何實(shí)現(xiàn)

    屬性申明 定義
    let domain: String = "local."
    let type: String = "_xiaopao._tcp"
    let port:Int32 = 1234
    var service: NetService!
    var browser: NetServiceBrowser!

1、發(fā)布服務(wù)

    @objc func publishService() {
        // 發(fā)布服務(wù)
        let name: String = "\(Int(Date().timeIntervalSince1970 * 1000))"
        service = NetService(domain: domain, type: type, name: name, port: port)
        service.delegate = self
        service.schedule(in: RunLoop.current, forMode: .common)
        
        // 發(fā)布的數(shù)據(jù)
        let dict: [String: Data] = ["name": "xiaopao".data(using: .utf8) ?? Data()]
        let data = NetService.data(fromTXTRecord: dict)
        service.setTXTRecord(data)
        
        // 開(kāi)始發(fā)布
        service.publish()
    }

1.1 發(fā)布服務(wù)代理

extension ViewController: NetServiceDelegate {
    // 將要發(fā)布服務(wù)
    func netServiceWillPublish(_ sender: NetService) {
        print(#function)
    }
    
    // 發(fā)布失敗處理
    func netService(_ sender: NetService, didNotPublish errorDict: [String : NSNumber]) {
        print(#function)
    }
    
    // 發(fā)布服務(wù)完成
    func netServiceDidPublish(_ sender: NetService) {
        print(#function)
    }
}

2、瀏覽服務(wù)

    @objc func browseService() {
        //瀏覽服務(wù)
        browser = NetServiceBrowser()
        browser.delegate = self
        browser.schedule(in: RunLoop.current, forMode: .common)
        browser.searchForServices(ofType: type, inDomain: domain)
    }

2.1瀏覽服務(wù)代理

// 瀏覽服務(wù)代理
extension ViewController: NetServiceBrowserDelegate {
    // 將要搜索服務(wù)
    func netServiceBrowserWillSearch(_ browser: NetServiceBrowser) {
        print(#function)
    }
    
    // 搜索不成功處理
    func netServiceBrowser(_ browser: NetServiceBrowser, didNotSearch errorDict: [String : NSNumber]) {
        print(#function)
    }
    
    // 搜索到服務(wù)
    func netServiceBrowser(_ browser: NetServiceBrowser, didFind service: NetService, moreComing: Bool) {
        print(#function)
        
        // 搜索服務(wù)開(kāi)始處理
        //調(diào)用 NetServiceDelegate代理的 netServiceWillResolve、netServiceDidResolveAddress等方法
        self.service = service
        service.delegate = self
        service.schedule(in: RunLoop.current, forMode: .common)
        service.resolve(withTimeout: 5)
        
    }
    
    // 服務(wù)已消失或者不可用
    func netServiceBrowser(_ browser: NetServiceBrowser, didRemove service: NetService, moreComing: Bool) {
        print(#function)
        let name = service.name
        let type = service.type
        let domain = service.domain
        print("移除服務(wù):····name:\(name),type:\(type),domain:\(domain)")
    }
}

3、互相通信

// 發(fā)布服務(wù)代理
extension ViewController: NetServiceDelegate {
    // 將要處理服務(wù)
    func netServiceWillResolve(_ sender: NetService) {
        print(#function)
    }
    
    // 處理服務(wù)
    func netServiceDidResolveAddress(_ sender: NetService) {
        guard let txtData = sender.txtRecordData() else { return }
        
        print(#function)
        let name = sender.name
        let type = sender.type
        let domain = sender.domain
        let dict = resolveDictionary(fromTXTRecord: txtData)
        print("處理服務(wù):····name:\(name),type:\(type),domain:\(domain),data\(dict)")
    }
    
    // 處理data數(shù)據(jù)轉(zhuǎn)成 字典[String:String]
    func resolveDictionary(fromTXTRecord data: Data) -> [String: String] {
        var dict = [String: String]()
        var offset = 0
        
        data.withUnsafeBytes({
            while offset < $0.count {
                let recordLength = Int($0[offset])
                offset += 1
                if recordLength > 0 {
                    let subBytes = $0[offset..<offset + recordLength]
                    let compoments = subBytes.split(separator: 61)
                    if compoments.count == 2 {
                        let key = String(bytes: Data(compoments[0]), encoding: .utf8) ?? ""
                        let value = String(bytes: Data(compoments[1]), encoding: .utf8) ?? ""
                        dict[key] = value
                    }
                }
                offset += recordLength
            }
        })
        return dict
    }
    
    // 處理服務(wù)時(shí) 發(fā)生錯(cuò)誤
    func netService(_ sender: NetService, didNotResolve errorDict: [String : NSNumber]) {
        print(#function)
    }
    
    func netService(_ sender: NetService, didUpdateTXTRecord data: Data) {
        print(#function)
    }
}

參考文檔：
http://www.itdecent.cn/p/94c5848894e1