The array of fields used to build the alert message
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- watchOS 3.0+
This property contains an array of
NSString objects, each of which corresponds to a field of the record that triggered the push notification. Use the field values to replace any substitution variables in the alert strings specified by the
notification or Identifying the Notification Object properties. The field values must be
NSDate objects. String values that are greater than 100 characters in length may be truncated when added to the push notification.
If you used
%@ for your substitution variables, those variables are replaced by walking the array in order. If you use variables of the form
n is an integer,
n represents the index (starting at 1) of the item in the array to use. Thus, the first item in the array replaces the variable
%1$@, the second item replaces the variable
%2$@, and so on. You can use indexed substitution variables to change the order of items in the resulting string, which might be necessary when you localize your app’s messages.