Returns a new URL made by appending a path component to the original URL, along with a trailing slash if the component is designated a directory.
- iOS 5.0+
- macOS 10.7+
- tvOS 5.0+
- watchOS 2.0+
The path component to add to the URL.
true, a trailing slash is appended after
A new URL with
If the original URL does not end with a forward slash and
path does not begin with a forward slash, a forward slash is inserted between the two parts of the returned URL, unless the original URL is the empty string.