APS Dictionary Keys
The aps dictionary contains the keys used by Apple to deliver the notification to the user’s device. The keys specify the type of interactions that you want the system to use when alerting the user. Table 9-1 lists the keys to include in this dictionary along with the type of information to include in each. Any other keys in the aps dictionary are ignored by Apple.
Table 9-1Keys and values of the aps dictionary
Key | Value type | Comment |
| Dictionary or String | Include this key when you want the system to display a standard alert or a banner. The notification settings for your app on the user’s device determine whether an alert or banner is displayed. The preferred value for this key is a dictionary, the keys for which are listed in Table 9-2. If you specify a string as the value of this key, that string is displayed as the message text of the alert or banner. The JSON |
| Number | Include this key when you want the system to modify the badge of your app icon. If this key is not included in the dictionary, the badge is not changed. To remove the badge, set the value of this key to |
| String | Include this key when you want the system to play a sound. The value of this key is the name of a sound file in your app’s main bundle or in the For details about providing sound files for notifications; see Preparing Custom Alert Sounds. |
| Number | Include this key with a value of |
| String | Provide this key with a string value that represents the notification’s type. This value corresponds to the value in the |
| String | Provide this key with a string value that represents the app-specific identifier for grouping notifications. If you provide a Notification Content app extension, you can use this value to group your notifications together. For local notifications, this key corresponds to the |
Alert Keys
Table 9-2 lists the keys and expected values for the alert dictionary.
Table 9-2Child properties of the alert property
Key | Value type | Comment |
| String | A short string describing the purpose of the notification. Apple Watch displays this string as part of the notification interface. This string is displayed only briefly and should be crafted so that it can be understood quickly. This key was added in iOS 8.2. |
| String | The text of the alert message. |
| String or | The key to a title string in the |
| Array of strings or | Variable string values to appear in place of the format specifiers in |
| String or | If a string is specified, the system displays an alert that includes the Close and View buttons. The string is used as a key to get a localized string in the current localization to use for the right button’s title instead of “View”. See Localizing the Content of Your Remote Notifications for more information. |
| String | A key to an alert-message string in a |
| Array of strings | Variable string values to appear in place of the format specifiers in |
| String | The filename of an image file in the app bundle, with or without the filename extension. The image is used as the launch image when users tap the action button or move the action slider. If this property is not specified, the system either uses the previous snapshot, uses the image identified by the |
------------------越是喧嚣的世界，越需要宁静的思考------------------ 合抱之木，生于毫末；九层之台，起于垒土；千里之行，始于足下。 积土成山，风雨兴焉；积水成渊，蛟龙生焉；积善成德，而神明自得，圣心备焉。故不积跬步，无以至千里；不积小流，无以成江海。骐骥一跃，不能十步；驽马十驾，功在不舍。锲而舍之，朽木不折；锲而不舍，金石可镂。蚓无爪牙之利，筋骨之强，上食埃土，下饮黄泉，用心一也。蟹六跪而二螯，非蛇鳝之穴无可寄托者，用心躁也。
