【IOS】建立易於使用的擴充套件程式/功能以實現可達性(主機/網際網路WIFI，蜂窩網路)
2020-11-05 IOS
我正在開發一個複雜的應用程式，我想在從伺服器接收資料的每個ViewController上測試兩個主機的網際網路可訪問性，我目前正在使用此庫來實現可訪問性
https://github.com/ashleymills/Reachability.swift
我想建立一個簡單的方法或擴充套件，以檢查網際網路和主機的可達性
我已經在下面的庫中使用了示例程式碼:`import UIKit
import Reachability
class VC22: UIViewController {
@IBOutlet weak var networkStatus: UILabel!
@IBOutlet weak var hostNameLabel: UILabel!
var reachability: Reachability?
override func viewDidLoad() {
super.viewDidLoad()
// Start reachability without a hostname intially
setupReachability(nil, useClosures: true)
startNotifier()
// After 5 seconds, stop and re-start reachability, this time using a hostname
let dispatchTime = DispatchTime.now() + DispatchTimeInterval.seconds(5)
DispatchQueue.main.asyncAfter(deadline: dispatchTime) {
self.stopNotifier()
self.setupReachability("http://81.28.42.42:4242/", useClosures: true)
self.startNotifier()
let dispatchTime = DispatchTime.now() + DispatchTimeInterval.seconds(5)
DispatchQueue.main.asyncAfter(deadline: dispatchTime) {
self.stopNotifier()
self.setupReachability("invalidhost", useClosures: true)
self.startNotifier() }
}
}
func setupReachability(_ hostName: String?, useClosures: Bool) {
hostNameLabel.text = hostName != nil ? hostName : "No host name"
print("--- set up with host name: \(hostNameLabel.text!)")
let reachability = hostName == nil ? Reachability() : Reachability(hostname: hostName!)
self.reachability = reachability
if useClosures {
reachability?.whenReachable = { reachability in
DispatchQueue.main.async {
self.updateLabelColourWhenReachable(reachability)
}
}
reachability?.whenUnreachable = { reachability in
DispatchQueue.main.async {
self.updateLabelColourWhenNotReachable(reachability)
}
}
} else {
NotificationCenter.default.addObserver(self, selector: #selector(VC22.reachabilityChanged(_:)), name: ReachabilityChangedNotification, object: reachability)
}
}
func startNotifier() {
print("--- start notifier")
do {
try reachability?.startNotifier()
} catch {
networkStatus.textColor = .red
networkStatus.text = "Unable to start\nnotifier"
return
}
}
func stopNotifier() {
print("--- stop notifier")
reachability?.stopNotifier()
NotificationCenter.default.removeObserver(self, name: ReachabilityChangedNotification, object: nil)
reachability = nil
}
func updateLabelColourWhenReachable(_ reachability: Reachability) {
print("\(reachability.description) - \(reachability.currentReachabilityString)")
if reachability.isReachableViaWiFi {
self.networkStatus.textColor = .green
} else {
self.networkStatus.textColor = .blue
}
self.networkStatus.text = reachability.currentReachabilityString
}
func updateLabelColourWhenNotReachable(_ reachability: Reachability) {
print("\(reachability.description) - \(reachability.currentReachabilityString)")
self.networkStatus.textColor = .red
self.networkStatus.text = reachability.currentReachabilityString
}
func reachabilityChanged(_ note: Notification) {
let reachability = note.object as! Reachability
if reachability.isReachable {
updateLabelColourWhenReachable(reachability)
} else {
updateLabelColourWhenNotReachable(reachability)
}
}
deinit {
stopNotifier()
}
}
這工作正常，但我只需要一個布林值即可告訴我是否已連線，可以通過應用程式重用
當前我正在使用下面的類:UPDATE
import Foundation
import SystemConfiguration
public class Reachability {
class func isConnectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in
SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
}
}
var flags: SCNetworkReachabilityFlags = SCNetworkReachabilityFlags(rawValue: 0)
if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {
return false
}
let isReachable = flags == .reachable
let needsConnection = flags == .connectionRequired
return isReachable && !needsConnection
}
}
並在如下所示的viewControllers中使用:
if Reachability.isConnectedToNetwork() == true {
print("Internet connection OK")
JSONParseFunction()
} else {
print("Internet connection FAILED")
let alert = UIAlertView(title: "You are not connect to internet", message: "please check you connectivity", delegate: nil, cancelButtonTitle: "OK")
alert.show()
}
這樣，我只需要檢查網際網路，就需要同時檢查主機和網際網路
解決辦法
是否有理由不只是將其放在AppDelegate中並訂閱那裡的觀察者，而不是在特定的vc上這樣做？
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
prepareReachabilityObserver()
return true
}
private func prepareReachabilityObserver() {
AppDelegate.reachability.whenUnreachable = { reachability in
DispatchQueue.main.async {
print("Not reachable")
}
}
do {
try AppDelegate.reachability.startNotifier()
} catch {
print("Unable to start notifier")
}
}
在
host verification extension部分，我可能會喜歡這樣的東西:extension UIViewController {
internal func isReachable() -> Bool {
//this is the function you already have.
}
}
然後您可以在每個ViewController中使用
self.isReachable() //'self' is a UIViewController in this case.
除此之外，由於您似乎已經解決了這個問題，因此我很難理解您的問題。
編輯:我想我現在明白你的問題。您要檢查是否可以訪問以及傳遞的主機名是否也可以訪問。
我認為最好不要同時處理這兩個問題，因為一個是可達性問題(“我可以得到傳出的連線嗎？”)，另一個是連線問題(“我可以得到一個響應嗎？或“此請求是否超時？”)。
我目前處理它的方式是通過AppDelegate之類的Reachability，然後以逐個請求的方式處理超時(然後可以在網路資料範圍內進行概括)。
更具體:
AppDelegate設定可達性。然後，我有一個RequestsManager，它使用配置的timeout處理服務呼叫。然後，您可以執行以下操作:
RequestManager.makeRequest("https://an.endpoint.of.yours",
onSuccess: {},
onFailure: { //Here goes your timeout behaviour.
})
我在哪裡傳遞主機名？
老實說，我認為這是不必要的行為。您不先
try to open door，然後您open door。您只是嘗試看看您是否成功。都一樣您嘗試發出請求，成功了嗎？太棒了不是嗎相應地處理。如果失敗是由於端點故障或由於沒有有效的資料計劃或網路故障，您(該應用程式)在乎什麼？無論哪種方式，請求都會超時，這就是您所關心的。同樣，這全部都是假設我確實瞭解您的情況，但我不確定100％。