Hi,
Members of NSString, except those defined in Foundation, are available on
values of type String. For example,
extension NSString {
@objc func foo() {}
}
let s: String = “hello”
s.foo()
We don’t do this for any other bridged types, for instance NSArray methods are
not imported as Array methods. It’s literally a special case in the type
checker for member lookup on String.
This behavior doesn’t really much sense conceptually and it was put in as a
stop-gap in Swift 1 to beef up the String API. I would like to phase it out as
follows:
- Unconditional warning in Swift 4.1, with a fixit to insert an ‘as NSString’
cast
- Error in Swift 5 with -swift-version 5
What does everyone think about this?
Slava
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