How to silence a warning in swift

Question

I have a piece of code which is generating lots of warnings (deprecated API)

Using clang* I could do

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    ...
#pragma clang diagnostic pop

However this does not work in swift.

How to do it in swift ?

Note: I don't want to disable the warning globally, nor even file wide, but just disable a specific warning in a specific part of my source code.

Edit: I looks like my note was not clear enough: I do NOT want conditional compilation (which is the proposed answer of the supposed duplicate). I just want to silence a warning WITHOUT using the new APIs.

Answer 1

As of 2018, Xcode 10.0, the consensus is that there is no way to achieve that.

I'll update/edit this answer if Apple add the feature.

Put it in your wish list for WWDC 2019 !

Answer 2

Actually, you can suppress these warnings by using @available in the enclosing logical structure (i.e. function/type).

For example, say you have some code which uses the AddressBook framework, but you're building against iOS 9.

@available(iOS, deprecated: 9.0)
func addressBookStatus() -> ABAuthorizationStatus {
    return ABAddressBookGetAuthorizationStatus()
}

As of Xcode 7.0.1 this will prevent the inline warnings from being displayed.

Answer 3

There is no general construct to silence deprecation warnings in Swift, but there is a workaround that can be applied in many cases.

Let's say you have a method getLatestImage() on class Foo which uses deprecated methods/classes.

Use @available as Daniel Thorpe described to silence all the warnings inside the method:

@available(iOS, deprecated: 9.0)
func getLatestImage() -> UIImage? {
    ...
}

Now you would like to call the method getLatestImage() without having a deprecation warning. You can achieve that by first defining a protocol and an extension:

private protocol GetLatestImage {
    func getLatestImage() -> UIImage?
}
extension Foo: GetLatestImage {}

And then call the method without a deprecation warning (if foo is an instance of Foo):

(foo as GetLatestImage).getLatestImage() // no deprecation warning

The result is you have Swift code that uses deprecated API without any deprecation warnings.