@selector() in Swift?

Question

I\'m trying to create an NSTimer in Swift but I\'m having some trouble.

NSTimer(timeInterval: 1, target: self, selector: test(), us         


        

Answer 1

selector is a word from Objective-C world and you are able to use it from Swift to have a possibility to call Objective-C from Swift It allows you to execute some code at runtime

Before Swift 2.2 the syntax is:

Selector("foo:")

Since a function name is passed into Selector as a String parameter("foo") it is not possible to check a name in compile time. As a result you can get a runtime error:

unrecognized selector sent to instance

After Swift 2.2+ the syntax is:

#selector(foo(_:))

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