> On May 26, 2016, at 9:25 PM, Austin Zheng via swift-evolution
> <[email protected]> wrote:
>
> ```
> myPerson.typedReadWriteProperty<Int>("age")?.set(30)
>
> try myPerson.allNamedProperties["age"]?.set(30)
> ```
>
Can you elaborate on what this API would be used for? KVC? For instance, I
played with Mirror the other day and my code to get a value given the property
name looked more like this:
let age = myPerson.value(forKey:”age”) as! Int
And this is what I did:
// KVC stands for key-value-coding… but I only know how to get values. I don’t
know how to set values
protocol KVC {
func value(forKey key: String) -> Any!
}
// Default implementation
extension KVC {
func value(forKey key: String) -> Any! {
let aMirror = Mirror(reflecting:self)
for case let (label?, value) in aMirror.children {
if label == key {
return value
}
}
return nil
}
}
public struct Person : KVC {
let firstName: String
let lastName: String
let age: Int
func fullName() -> String {
return "\(firstName) \(lastName)"
}
}
let aPerson = Person(firstName:"John", lastName:"Doe", age:48)
// It works for stored properties
let lastName = aPerson.value(forKey:"lastName") as! String
print("Last name is \(lastName)")
// It does not work for instance methods, i.e. fullName is not a stored property
let fullName = aPerson.value(forKey:"fullName")
if fullName != nil {
print("Full name is \(fullName)")
} else {
print("Unable to get fullName via KVC")
}
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