iOS11以降の Network Reachability

よく使われているReachabilityに関する誤解やネットワークの接続状況を確認するためにiOS11以降で登場したフレームワークやAppleのドキュメントに記載のある接続が切断された時の対処法などについての資料です。

Transcript

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3. ΞϓϦར༻؀ڥ͕֦େ wϚϧνϓϥοτϑΥʔϜ
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4. 4$/FUXPSL3FBDIBCJMJUZ w4ZTUFN$POpHVSBUJPOGSBNFXPSLͷΠϯ λʔϑΣΠε
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5. 3FBDIBCJMJUZTXJGU w"QQMF͕ఏڙ͍ͯ͠ΔαϯϓϧίʔυΛݩʹ ͨ͠ωοτϫʔΫ઀ଓঢ়گΛ֬ೝ͢ΔϥΠ ϒϥϦ
   wΫϩʔδϟ΍/PUJpDBUJPOͰݱࡏͷ઀ଓঢ়گ Λ֬ೝͰ͖Δ https://github.com/ashleymills/Reachability.swift
6. 3FBDIBCJMJUZTXJGU https://github.com/ashleymills/Reachability.swift //declare this property where it won't go out of scope relative to your listener let reachability = Reachability()! reachability.whenReachable = { reachability in if reachability.connection == .wifi { print("Reachable via WiFi") } else { print("Reachable via Cellular") } } reachability.whenUnreachable = { _ in print("Not reachable") } do { try reachability.startNotifier() } catch { print("Unable to start notifier") }
7. 3FBDIBCJMJUZͷޡղ let reachability = Reachability()! if reachability.connection == .wifi { print("ϦϞʔτ௨৴ͯ͠ը૾Λऔಘ") } else { print(“ϩʔΧϧΩϟογϡΛ࢖͏") }
8. 3FBDIBCJMJUZͷޡղ “Always attempt to make a connection. Do not attempt to guess whether network service is available, and do not cache that determination.” https://developer.apple.com/library/archive/documentation/NetworkingInternetWeb/Conceptual/NetworkingOverview/WhyNetworkingIsHard/WhyNetworkingIsHard.html#//apple_ref/doc/ uid/TP40010220-CH13-SW3 ઀ଓΛࢼΈΔલʹνΣοΫΛͯ͠͸͍͚ͳ͍
9. 3FBDIBCJMJUZͷਖ਼͍͠࢖͍ํ Important: The SCNetworkReachability API is not intended for use as a preflight mechanism for determining network connectivity. You determine network connectivity by attempting to connect. If the connection fails consult the SCNetworkReachability API to help diagnose the cause of the failure. https://developer.apple.com/library/archive/documentation/NetworkingInternetWeb/Conceptual/NetworkingOverview/WhyNetworkingIsHard/WhyNetworkingIsHard.html#//apple_ref/doc/ uid/TP40010220-CH13-SW3 ·ͣ͸઀ଓΛࢼͯ͠Έͯ
   ࣦഊͨ͠ͱ͖ͷݪҼΛಛఆ͢ΔͨΊʹ࢖͏
10. ͨͩɻɻɻ ࠁʑͱมԽ͢Δ ωοτϫʔΫͷ઀ଓঢ়گΛߟྀͯ͠ ਖ਼࣮͘͠૷͢Δͷ͸೉͍͠
11. XBJUT'PS$POOFDUJWJUZ https://developer.apple.com/documentation/foundation/urlsessionconfiguration/2908812-waitsforconnectivity wJ04Ͱొ৔
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    wඞཁͳ઀ଓঢ়گΛߟྀͯ͘͠ΕΔ
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12. ઃఆํ๏ λΠϛϯά͸63-4FTTJPOͷΠϯελϯεੜ੒લ let configuration = URLSessionConfiguration.default configuration.waitsForConnectivity = true let session = URLSession(configuration: configuration) λΠϜΞ΢τΛઃఆ͢Δ σϑΥϧτ͸̍िؒ configuration.timeoutIntervalForResource = 600 // 10෼
13. ઃఆํ๏ EFMFHBUFͰ࠶઀ଓ࣌ͷΠϕϯτΛड͚औΔ let session = URLSession(configuration: configuration, delegate: delegate, delegateQueue: nil) 63-4FTTJPO͸EFMFHBUFΛڧࢀর͢Δ “The session object keeps a strong reference to the delegate until your app exits or explicitly invalidates the session. If you don’t invalidate the session, your app leaks memory until it exits.” session.invalidateAndCancel()
14. ͨͩɻɻɻ ༗ޮͳͷ͸ϦΫΤετ࣌ʹ઀ଓ͕ͳ͘࠶઀ଓͨ࣌͠ ⽐ ϦΫΤετ࣌ʹ͸੒ޭͨ͠΋ͷͷ
    ్தͰ઀ଓ͕੾Εͯ͠·ͬͨ৔߹ʹ͸
    ࠶ૹͯ͘͠Εͳ͍ NSURLErrorNetworkConnectionLost 1005)
15. ରॲ๏ 63-4FTTJPOͷڍಈΛཧղ͢Δ https://developer.apple.com/library/archive/qa/qa1941/_index.html#//apple_ref/doc/uid/DTS40017602 
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16. ରॲ๏ ࣮૷ͷํ਑ https://developer.apple.com/library/archive/qa/qa1941/_index.html#//apple_ref/doc/uid/DTS40017602 
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    Ϩεϙϯε͕͍ͭ΋ಉ͡ϦΫΤετ (&5ͳͲ ͷ৔߹
    
    
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    ɹؒҧ͍ͬͯΔ৔߹͸αʔόʔଆͰରॲ͢Δํ͕ద੾
17. ଞͷ໰୊ ϞόΠϧσʔλ௨৴ͷ࢖༻Մ൱͸ϑϥάͰ൑ఆͰ͖ͳ͍
    
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