swiftios8nsinvocationoperation

'NSInvocationOperation' is unavailable in Xcode 6.1

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.

Solution

  • 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
}