6

My code suddenly can't be compiled in Xcode 6.1 (I'm sure it's working in Xcode 6 GM and beta version). It shows the error message:

'NSInvocationOperation' is unavailable

My code is:

let operation = NSInvocationOperation(target:self, selector:"backgroundRun:", object:self)

Can anybody help? Thanks.

Bagusflyer
  • 12,675
  • 21
  • 96
  • 179
  • The [8.1 API differences](https://developer.apple.com/library/ios/releasenotes/General/iOS81APIDiffs/modules/Foundation.html) list `NSInvocationOperation` as having been removed. – Rob Oct 30 '14 at 04:13

1 Answers1

20

As of Xcode 6.1, NSInvocation is disabled in Swift, therefore, NSInvocationOperation is disabled too. See this thread in Developer Forum

Because it's not type-safe or ARC-safe. Even in Objective-C it's very very easy to shoot yourself in the foot trying to use it, especially under ARC. Use closures/blocks instead.

You have to use NSBlockOperation in Swift.

or addOperationWithBlock to NSOperationQueue

queue.addOperationWithBlock { [weak self] in
    self?.backgroundRun(self)
    return
}
rintaro
  • 51,423
  • 14
  • 131
  • 139