'NSInvocationOperation' is unavailable in Xcode 6.1

问题

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.

回答1:

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
}

来源：https://stackoverflow.com/questions/26644477/nsinvocationoperation-is-unavailable-in-xcode-6-1