GNSSubscriptionParams 類別
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
訂閱項目的選用參數。
如需各個參數的說明，請參閱下方的屬性宣告。
繼承 NSObject。
| - (GNSDeviceTypes) deviceTypesToDiscover |
|
readwritenonatomicassign |
要探索的裝置類型。
預設值為 kGNSDeviceUsingNearby。
| - (NSString*) messageNamespace |
|
readwritenonatomicassign |
要比對的訊息命名空間。
空字串是預設的命名空間，而且僅供每個應用程式 (或共用 Google Developer Console 專案的應用程式) 使用。
| - (GNSOperationStatusHandler) statusHandler |
|
readwritenonatomiccopy |
訂閱狀態的處理常式。
可用於追蹤新建訂閱項目的狀態。
| - (GNSPermissionRequestHandler) permissionRequestHandler |
|
readwritenonatomiccopy |
用於要求使用者授予鄰近分享功能使用權限的處理常式。
這個處理常式會覆寫「附近」使用的預設對話方塊；如果您提供這個處理常式，「附近」就不會顯示其權限對話方塊。
在要求處理常式中，建議您向使用者要求權限，以執行需要使用 Nearby 功能的工作，並說明使用原因。當使用者表示同意或拒絕同意時，您必須呼叫傳遞至要求處理常式的區塊。如果您傳遞 YES 到區塊，表示使用者已同意允許使用 Nearby 功能。如果您傳遞 NO，表示使用者尚未表示同意；在取得同意聲明後，您的出版品和訂閱才會生效。
處理常式也可做為 iOS 權限對話方塊的「預檢」方法。您可以使用這個圖示，說明應用程式為何需要先取得 iOS 權限，才能執行「鄰近分享」相關功能。
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上次更新時間：2025-08-13 (世界標準時間)。
[null,null,["上次更新時間：2025-08-13 (世界標準時間)。"],[[["\u003cp\u003e\u003ccode\u003eGNSSubscriptionParams\u003c/code\u003e provides optional parameters for customizing Nearby Messages subscriptions.\u003c/p\u003e\n"],["\u003cp\u003eParameters include device types, message namespace and type, discovery strategies, and handlers for status and permissions.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003estrategy\u003c/code\u003e property controls discovery of Nearby devices, while \u003ccode\u003ebeaconStrategy\u003c/code\u003e is for beacon scanning.\u003c/p\u003e\n"],["\u003cp\u003eYou can define handlers to monitor subscription status and manage user permission requests for Nearby.\u003c/p\u003e\n"],["\u003cp\u003eDefault values are provided for most parameters, simplifying basic subscription setup.\u003c/p\u003e\n"]]],[],null,["# GNSSubscriptionParams Class\n\n[Properties](#properties) \nGNSSubscriptionParams Class Reference \n\nOverview\n--------\n\nOptional parameters for a subscription.\n\nSee the property declarations below for explanations of each parameter.\n\nInherits NSObject.\n\n|----------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------|\n| Property Summary ---------------- ||\n| GNSDeviceTypes | [deviceTypesToDiscover](/nearby/messages/ios/reference/interface_g_n_s_subscription_params#aa972c219c7211e4a7c5fa785d0b11274) |\n| | The types of devices to discover. [More...](#aa972c219c7211e4a7c5fa785d0b11274) |\n| ||\n| NSString \\* | [messageNamespace](/nearby/messages/ios/reference/interface_g_n_s_subscription_params#a70e97d712c8bc53a7f9076055a91256a) |\n| | The message namespace to match. [More...](#a70e97d712c8bc53a7f9076055a91256a) |\n| ||\n| NSString \\* | [type](/nearby/messages/ios/reference/interface_g_n_s_subscription_params#a86a3f486660ee32e5824b03fcef62533) |\n| | The message type to match. Must not be nil. The empty string is the default type. [More...](#a86a3f486660ee32e5824b03fcef62533) |\n| ||\n| [GNSStrategy](/nearby/messages/ios/reference/interface_g_n_s_strategy) \\* | [strategy](/nearby/messages/ios/reference/interface_g_n_s_subscription_params#a20f64cb0cfd8890f640536dfb586e814) |\n| | The strategy to use for discovering Nearby devices (non-beacons). [More...](#a20f64cb0cfd8890f640536dfb586e814) |\n| ||\n| [GNSBeaconStrategy](/nearby/messages/ios/reference/interface_g_n_s_beacon_strategy) \\* | [beaconStrategy](/nearby/messages/ios/reference/interface_g_n_s_subscription_params#a2a2c2aecb81fef6ff47fc4204110f6da) |\n| | The strategy to use for beacon scanning. [More...](#a2a2c2aecb81fef6ff47fc4204110f6da) |\n| ||\n| GNSOperationStatusHandler | [statusHandler](/nearby/messages/ios/reference/interface_g_n_s_subscription_params#afb1a6c67329810c58745f2f4625240cc) |\n| | A handler for subscription status. [More...](#afb1a6c67329810c58745f2f4625240cc) |\n| ||\n| GNSPermissionRequestHandler | [permissionRequestHandler](/nearby/messages/ios/reference/interface_g_n_s_subscription_params#ac037a18632caddcdb730bdb2a0f9c1b1) |\n| | A handler for requesting user permission to use Nearby. [More...](#ac037a18632caddcdb730bdb2a0f9c1b1) |\n| ||\n\nProperty Detail\n---------------\n\n|-------------------------------------------------------------------------------------------|--------------------------|\n| |------------------------------------------| | - (GNSDeviceTypes) deviceTypesToDiscover | | readwritenonatomicassign |\n\nThe types of devices to discover.\n\nThe default is `kGNSDeviceUsingNearby`. \n\n|-------------------------------------------------------------------------|--------------------------|\n| |---------------------------------| | - (NSString\\*) messageNamespace | | readwritenonatomicassign |\n\nThe message namespace to match.\n\nThe empty string is the default namespace, and is private to each app (or apps sharing a Google Developer Console project). \n\n|-------------------------------------------------|--------------------------|\n| |---------------------| | - (NSString\\*) type | | readwritenonatomicassign |\n\nThe message type to match. Must not be nil. The empty string is the default type. \n\n|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------|\n| |---------------------------------------------------------------------------------------| | - ([GNSStrategy](/nearby/messages/ios/reference/interface_g_n_s_strategy)\\*) strategy | | readwritenonatomicassign |\n\nThe strategy to use for discovering Nearby devices (non-beacons). \n\n|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------|\n| |----------------------------------------------------------------------------------------------------------| | - ([GNSBeaconStrategy](/nearby/messages/ios/reference/interface_g_n_s_beacon_strategy)\\*) beaconStrategy | | readwritenonatomicassign |\n\nThe strategy to use for beacon scanning. \n\n|-------------------------------------------------------------------------------------------------|------------------------|\n| |---------------------------------------------| | - (GNSOperationStatusHandler) statusHandler | | readwritenonatomiccopy |\n\nA handler for subscription status.\n\nIt can be used for tracking the status of a newly created subscription. \n\n|---------------------------------------------------------------------------------------------------------------------------|------------------------|\n| |----------------------------------------------------------| | - (GNSPermissionRequestHandler) permissionRequestHandler | | readwritenonatomiccopy |\n\nA handler for requesting user permission to use Nearby.\n\nThis handler overrides the default dialog used by Nearby; if you supply this handler, Nearby will not show its permission dialog.\n\nIn your request handler, you should request the user's permission to perform the task that requires the use of Nearby, explaining why it's being used. When the user has given or denied consent, you must call the block that's passed into your request handler. If you pass `YES` into the block, it means the user has consented to allow Nearby to function. If you pass `NO`, it means the user has not consented; your publications and subscriptions will not work until consent has been given.\n\nThe handler can also be used as a method of \"preflighting\" for the iOS permission dialogs. You can use it to explain why the user is expected to consent to the iOS permissions before your app can perform its Nearby related functions."]]
