How to resolve 'scanLocation' was deprecated in iOS 13.0

@rmaddy already gave the correct answer, but this shows how to increment the currentIndex since it is different from just adding 1 to the scanLocation.

while !scanner.isAtEnd {
    print(scanner.scanUpToCharacters(from: brackets))
    let block = scanner.string[scanner.currentIndex...]
    print(block)
    scanner.currentIndex = scanner.string.index(after: scanner.currentIndex)
}

tl;dr - use currentIndex instead of scanLocation when using Scanner in Swift.

Shame on Apple for the poor documentation. But based on information in the NSScanner.h file for the Objective-C version of Scanner, only in Swift, the scanLocation property has been deprecated and replaced with the currentIndex property.