如何检测在 iOS 8 上的包含应用程序中启用了应用程序扩展？

Question

我正在 iOS 8 beta 上开发自定义键盘，我想告诉用户如果我的自定义键盘未启用，如何在包含应用程序中启用它，有什么方法可以检测应用程序扩展是否已启用？

Answer 1

1. first of all let's set some constants to make it easy to understand each other:

   • containing app = the app that installs the extension and holds the extension binary and target
   • host app = the app that the extension is running inside (other party)
   • extension = any of iOS8's new components/modules that we can now build into system-wide use: custom keyboards, today widgets, photo editing effects, and more..

2. Apple also released a more quiet API called App Groups API This API allows a developer to group n extensions under 1 bundle identifier, and creates a communication wire between the app and the extensions contained in it.

3. you can share data between the extensions and the containing app using NUserDefaults, but with this new method:

    [[NSUserDefaults alloc] initWithSuiteName:@"<app group identifier>"];

   read/write... and sync:

    [myDefaultsObj synchronize];

4. and now to the bottom line:

   use the app group's url schemes to test what you want:

   https://developer.apple.com/library/prerelease/ios/documentation/Foundation/Reference/NSExtensionContext_Class/#//apple_ref/occ/instm/NSExtensionContext/openURL:completionHandler :

    - (void)openURL:(NSURL *)URL completionHandler:(void (^)(BOOL success))completionHandler

   • URL - The URL to open.
   • completionHandler - A block that is called when the URL has opened.
   • this parameter - success - is a Boolean value that indicates whether the open was successful.

Good luck!!!