Instance Method インスタンスメソッド

validateValue(_:forKeyPath:)

Throws an error when the value specified by a given pointer is not valid for a given key path relative to the receiver.

Declaration 宣言 

func validateValue(_ ioValue: AutoreleasingUnsafeMutablePointer<AnyObject?>, 
        forKeyPath inKeyPath: String) throws

Parameters パラメータ

ioValue

A pointer to a new value for the property identified by inKeyPath. This method may modify or replace the value in order to make it valid.

inKeyPath

The name of one of the receiver's properties. The key path must specify an attribute or a to-one relationship. The key path has the form relationship.property (with one or more relationships); for example department.name or department.manager.lastName.

Return Value 戻り値

A Boolean that is true if the value pointed at by ioValue is valid for the property identified by inKeyPath, or if the method is able to modify the value at ioValue to make it valid; otherwise false.

Discussion 解説

The default implementation of this function gets the destination instance for each relationship using value(forKey:) and then calls the validateValue(_:forKey:) function for the property. The outcome of that call determines whether this one throws an error or not.

See Also 参照

Validation 検証

func validateValue(AutoreleasingUnsafeMutablePointer<AnyObject?>, forKey: String)
Throws an error when the value specified by a given pointer is not valid or can't be made valid for the property identified by a given key.