iOS 16+下获取SSID返回空值/nil的适配问题求助

阿华AIGC实验室

2026-4-2

各位大佬好，我最近碰到了一个iOS版本适配的棘手问题：在iOS 16之前，用旧代码获取当前WiFi的SSID一直很正常，但升级到iOS 16及更高版本后，拿到的SSID总是空值或者nil，试了好几种方法都没解决，想请教下大家有没有类似的踩坑经历或者解决思路？

旧代码（iOS 16以下稳定可用）

这段代码在iOS 16及以下系统能正常获取到SSID：

func fetchSSIDInfo() -> String {
    var currentSSID = ""
    if let interfaces = CNCopySupportedInterfaces() {
        for i in 0..<CFArrayGetCount(interfaces) {
            let interfaceName: UnsafeRawPointer = CFArrayGetValueAtIndex(interfaces, i)
            let rec = unsafeBitCast(interfaceName, to: AnyObject.self)
            let unsafeInterfaceData = CNCopyCurrentNetworkInfo("\(rec)" as CFString)
            if let interfaceData = unsafeInterfaceData as? [String: AnyObject] {
                currentSSID = interfaceData["SSID"] as? String ?? ""
                debugPrint("fetchSSIDInfo 4", BUtility().currentDateInMillisec())
                debugPrint("ssid=\(currentSSID)")
            }
        }
    }
    return currentSSID
}

我尝试的新代码（iOS 16+仍返回空值）

查资料后知道iOS 14+推荐用NEHotspotNetwork.fetchCurrent API，于是写了带异步等待的新代码，同时保留了旧API的降级逻辑，但不管走新API还是降级到旧逻辑，返回的SSID都是空的：

func fetchSSIDInfo(_ timeout: TimeInterval = 1.0) -> String {
    // iOS 14+ path (NEHotspotNetwork.fetchCurrent is async callback)
    if #available(iOS 14.0, *) {
        let sem = DispatchSemaphore(value: 0)
        var ssidResult: String?
        
        NEHotspotNetwork.fetchCurrent { network in
            if let s = network?.ssid, !s.isEmpty {
                ssidResult = s
            }
            sem.signal()
        }
        
        // Wait for the callback (bounded by timeout)
        _ = sem.wait(timeout: .now() + timeout)
        
        if let s = ssidResult, !s.isEmpty {
            return s
        }
        // If NEHotspotNetwork didn't return an SSID (or timed out), fall through to CaptiveNetwork fallback.
    }
    
    // Fallback for older iOS or if NEHotspotNetwork didn't provide SSID
    if let interfaces = CNCopySupportedInterfaces() as? [String] {
        for interface in interfaces {
            if let info = CNCopyCurrentNetworkInfo(interface as CFString) as? [String: Any],
               let ssid = info["SSID"] as? String, !ssid.isEmpty {
                return ssid
            }
        }
    }
    return ""
}