Cocoa Programming for OS X: The Big Nerd Ranch Guide

For the More Curious: The caseInsensitiveCompare(_:) Method

In the previous section, you specified that the Selector used to sort the Name column should be caseInsensitiveCompare:. The caseInsensitiveCompare: selector corresponds to the method caseInsensitiveCompare(_:) on String. You can use that method programmatically as follows:

let motorsickle: String = "Piaggio"
let motorsigh: String = "Italjet"
let order: NSComparisonResult = motorsickle.caseInsensitiveCompare(motorsigh)

// Would motorsickle come first in the dictionary?
if order == .OrderedAscending {

}

Notice that caseInsensitiveCompare(_:) returns an NSComparisonResult. The NSComparisonResult describes the how the first string (motorsickle in this example) is ordered ...