### SharingServices ###
This example shows how to use the sharing services API (NSSharingService) in several ways:
* It invokes standard Twitter and Email sharing services directly from respective buttons.
* It creates a custom sharing service that can be selected from a sharing service picker (NSSharingServicePicker).
The main class is APLAppDelegate. This is the application delegate that configures the sharing buttons and acts as a controller to manage the sharing services.
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