substringFromIndex in Swift 3

Question

Ich bekomme Fehler für diese TeilstringFromIndex in Swift 3. Unten ist der Code in Objective-C, wenn ich versuche, in Swift 3, substringFromIndex konvertieren Fehler zu konvertieren.

NSString *checkhypenString = [securityNumberField.text substringFromIndex: [securityNumberField.text length] - 5]; 
    checkhypenString = [checkhypenString substringToIndex:1]; 

Answer 1

Try this -

let s = securityNumberField.text! // your string. 
    let start = s.startIndex 
    let end = s.index(s.endIndex, offsetBy: -5) 
    let substring = s[start..<end] 
    print(substring) 

Answer 2

Try this:

var index1 = string1.index(securityNumberField.text.endIndex, offsetBy: -4) 

var substring1 = string1.substring(from: index1)