setValue:forKey is always crashing in swift

Question

I have below use case:

class Foo: NSObject { var bar = "" } let foo = Foo() foo.setValue("A name", forKey: "bar") //throws exception: this class is not key value coding-compliant for the key bar. print("Foo.bar: \(foo.bar)")

Apple documentation (here) sais that in Swift each class subclasing NSObject becomes by default key value compliant. If so why am I getting not key value compliant exception?

Swift objects that inherit from NSObject or one of its subclasses are key-value coding compliant for their properties by default.

Am I missing something? Dose any one know which could be the problem?

Note: I tried to make the "bar" property NSString but i got the same exception.

This is answered. stackoverflow.com/questions/26667380/…

Tony Nguyen
– Tony Nguyen

2020-05-09 08:29:18 +00:00
Commented May 9, 2020 at 8:29 — Tony Nguyen
– Tony Nguyen, Commented May 9, 2020 at 8:29

Debashish Das · Accepted Answer · 2020-05-09 08:47:04Z

To implement KVC(Key-Value Coding) support for a property. you need the @objc annotation on your property, Since the current implementation of KVC is written in Objective-C, After adding @objc, Objective-c can see it.

class Foo: NSObject { @objc var bar = "" } let foo = Foo() foo.setValue("A name", forKey: "bar") print("Foo.bar: \(foo.bar)")

Collectives™ on Stack Overflow

setValue:forKey is always crashing in swift

1 Answer 1

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Linked

Related