CODEWITHSUNDEEP
iosswift
Oliver Atkinson
Oliver Atkinson

Reputation: 8029

Swift Class Extension - unrecognized selector sent to instance

When creating a class extension on a foundation class I get a unrecognized selector sent to instance when using the following:

extension NSURLSessionDataTask: Taskable {

  func isRunning() -> Bool {
    return state == .Running
  }

}

Error:

[__NSCFLocalDataTask isRunning]: unrecognized selector sent to instance 0x7fa93bdc07d0

I am trying to create a common task interface so I am able to use different kinds of classes such as operations and session tasks, is there something I am missing here?

Upvotes: 2

Views: 935

Answers (2)

Code Different
Code Different

Reputation: 93161

Many of Cocoa classes are "class clusters", meaning you may get a different one from what you asked for. NSCFLocalDataTask is a private class and looks like it doesn't inherit from NSURLSessionDataTask. Try moving your extension to NSURLSessionTask.

Upvotes: 4

gnasher729
gnasher729

Reputation: 52538

Why this might happen: Objective-C BOOL properties starting with "is" may be handled differently. It may be that your func is exported to Objective-C as the "running" method, not as "isRunning".

Upvotes: 0

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