Swift extension for a specific iOS version

Question

I need to create custom extension for my class that depends on iOS version.

So, for instance:

@available(iOS 10.0, *) extension Foo { func test() { print("do something for iOS 10.0 and later") } }

What if I would execute test for version between 9.0 (included) and 10.0 (excluded)?

You can't mark an extension with available. Just curious, why not add an availability check in the function? — ebby94
– ebby94, Commented Apr 11, 2017 at 9:13

Sivajee Battina · Accepted Answer · 2017-04-11 09:02:33Z

I should appreciate you for asking this question.

@available works similarly to #available in that you specify the iOS release you want to target, and then Xcode handles the rest. For example:

@available(iOS 9, *) func iOS9Work() { // do stuff }

If your deployment target is iOS 8, you can't call that iOS9Work() method without some availability checking first. You can stack up these checks if you need to, for example:

//You need to perform this check before calling if #available(iOS 9, *) { iOS9Work() } @available(iOS 9, *) func iOS9Work() { // do stuff }

In your case you have to call like this:

 if #available(iOS 10, *) { Foo() }

For more info: Availability Checking in Swift

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