CODEWITHSUNDEEP
swiftoverridingclass-extensions
Duck
Duck

Reputation: 35953

Trying to override NSView's drawRect from extension class

I am designing an NSView class extension in Swift. Inside that extension class, I am trying to override drawRect using this

extension NSView {


  override func drawRect(rect: NSRect) {


  }

There is an error pointing to the override and saying Method does not override any method from its superclass... Method drawRect with Objective-C (???) selector 'drawRect' conflicts with the previous declaration with the same Objective-C selector

What? Objective-C? I am using swift.

What is going on?

Upvotes: 0

Views: 699

Answers (1)

Matteo Piombo
Matteo Piombo

Reputation: 6726

You are extending not subclassing and then overriding a method which was already defined by the superclass.

drawRect is already defined by NSView, that's why the conflict with already defined ...

In order to do a custom view you are intended to define your own subclass of NSView and override your subclass's drawRect implementation.

class MyView: NSView {

    override func drawRect(rect: NSRect) {

     // Your custom implementation ....

    } 
}

Hope this helps

Upvotes: 2

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