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KeyValueCoding provides a mechanism by which you can access the properties of pure Swift struct or class instances indirectly by a property name or a key path.
The basic methods of KeyValueCoding protocol for accessing an instance’s values are setValue(_ value: Any?, key: String), which sets the value for the property identified by the specified name or key path, and value(key: String) -> Any?, which returns the value for the property identified by the specified name or key path.
Thus, all of the properties can be accessible in a consistent manner including:
There are next limitations:
In order to make your types key-value coding compliant just adopt them from the KeyValueCoding protocol, for instance:
You can also use subscripts to set and retrieve values by a name or a key path without needing separate methods for setting and retrieval:
Properties from inherited classes are also accessible by KeyValueCoding protocol:
KeyValueCoding doesn’t conflict with key-value conding of NSObject class and they can work together:
KeyValueCoding works with structs as well:
You can inherit any protocol from KeyValueCoding one and then use instances with the protocol type to access to declared properties:
In additional you can use API functions to set and get values of any properties without adopting KeyValueCoding protocol at all:
Swift instances of struct or class that adopt KeyValueCoding protocol are key-value coding compliant for their properties and they are addressable via essential methods value(key:) and setValue(_: key:).
Returns the metadata of the instance which includes its type, kind, size and a list of accessible properties:
Outputs:
Returns a value for a property identified by a given name or key path.
Sets a property specified by a given name or key path to a given value.
Gets and sets a value for a property identified by a name or a key path.
Global API functions to set, get and retrieve metadata information from any instance or type even without adopting KeyValueCoding protocol.
Returns the metadata of an instance or a type which includes its type, kind, size and a list of accessible properties:
Outputs:
Returns the value for the instance’s property identified by a given name or key path.
Sets a property of an instance specified by a given name or key path to a given value.
Add KeyValueCoding package dependency to your Package.swift file:
KeyValueCoding is available under the MIT license. See the LICENSE file for more info.
View Github
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