kev kev - 6 months ago 60
Swift Question

Key-Value Coding (KVC) with Array/Dictionary in Swift

Is it possible to key-value code (KVC) with native Swift data structures such as Array and Dictionary? Key-Value coding is still available for NSFoundation structures within Swift, just like in Objective C.

For example, this is valid:

var nsarray: NSArray = NSArray()
// Fill the array with objects
var array: NSArray = nsarray.valueForKeyPath("key.path")


But this is invalid:

var swiftarray: Array = []
// Fill the array with objects
var array = swiftarray.valueForKeyPath("key.path") // Invalid, produces a compile-time error

kev kev
Answer

It seems that KVC on native Swift objects is just not supported. Here's the most elegant workaround I've found:

var swiftarray: Array = []
// Fill the array with objects
var array: NSArray = (swiftarray as NSArray).valueForKeyPath("key.path") as NSArray
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