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I am using the following code to get a String substring from an NSRange:
func substring(with nsrange: NSRange) -> String? {
guard let range = Range.init(nsrange)
else { return nil }
let start = UTF16Index(range.lowerBound)
let end = UTF16Index(range.upperBound)
return String(utf16[start..<end])
}
(via: https://mjtsai.com/blog/2016/12/19/nsregularexpression-and-swift/)
When I compile with Swift 4 (Xcode 9b4), I get the following errors for the two lines that declare start and end:
'init' is unavailable
'init' was obsoleted in Swift 4.0
I am confused, since I am not using an init.
How can I fix this?
992
A structure used to describe a portion of a series, such as characters in a string or objects in an array. iOS 2.0+ iPadOS 2.0+ macOS 10.0+ Mac Catalyst 13.0+ tvOS 9.0+ watchOS 2.0+
In Swift 4 you slice a string into a substring using subscripting. The use of substring(from:) , substring(to:) and substring(with:) are all deprecated.
Ranges with Strings< range operators are a shorthand way of creating ranges. For example: let myRange = 1..<3. let myRange = CountableRange<Int>(uncheckedBounds: (lower: 1, upper: 3)) // 1..<3.
Use Range(_, in:) to convert an NSRange to a Range in Swift 4.
extension String {
func substring(with nsrange: NSRange) -> Substring? {
guard let range = Range(nsrange, in: self) else { return nil }
return self[range]
}
}
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