CODEWITHSUNDEEP
swiftbackground-task
user8862022
user8862022

Reputation:

Background tasks in swift 3

What is equivalent of respond to selector for background tasks? I found the code in Objective-C. I'm trying to get the same in Swift.

Here is the Objective-C code:

if ([application respondsToSelector:@selector(beginBackgroundTaskWithExpirationHandler:)]){
    bgTaskId = [application beginBackgroundTaskWithExpirationHandler:^{
    })

Swift code:

if application.responds(to: #selector(self.beginBackgroundTaskWithExpirationHandler)) {
    bgTaskId = application.beginBackgroundTask(expirationHandler: {() -> Void in
        print("background task \(UInt(bgTaskId!)) expired")
    })

It's saying BackgroundTaskManager has no member 'beginBackgroundTaskWithExpirationHandler'.

What is the exact thing we can replicate in Swift 3?

Upvotes: 0

Views: 444

Answers (1)

rmaddy
rmaddy

Reputation: 318804

Unless you are attempting to support iOS 3 or earlier, there is no need to check for the existence of the selector since it was added in iOS 4.0.

But the Swift selector would be: beginBackgroundTask(expirationHandler:).

Here's a simple trick when trying to convert an Objective-C API into Swift. Pull up the API documentation in Xcode or online. Choose the Objective-C APIs. Find the method you wish to convert. Then switch the documentation to the Swift APIs. In a case like this you will now see the same method but in Swift.

Upvotes: 1

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