Checking if a string contains a text in a textfield

Question

How can I check if a String (for example "apple") contains text that I typed in a UITextField (for example "p" or "pp").
If the String contains the UITextField's text, I want to print a message - for example: "apple contains pp".

Try this http://stackoverflow.com/questions/24034043/how-do-i-check-if-a-string-contains-another-string-in-swift — Pet Rat, Jun 19 '16 at 13:42

Akshansh Thakur · Accepted Answer · 2016-06-19T13:42:17.687

3

You can achieve that like so

class youClass: NSObject {
  var yourTextFieldName = UITextField()

   func someMethod() {
     var apple = "apple"
     if apple.containsString(self.yourTextfieldName.text!) {
        print("apple contains \(self.yourTextfieldName.text!)")
     }
   }
}

edited Jun 19 '16 at 13:42

answered Jun 19 '16 at 13:35

Akshansh Thakur

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Glad I could help, @NoNameL. Happy coding – Akshansh Thakur Jun 19 '16 at 14:38

Marcus Rossel · Answer 2 · 2016-06-19T14:07:54.090

You could extend String:

extension String {
  @discardableResult
  func containsText(of textField: UITextField) -> Bool {
    // Precondition
    guard let text = textField.text else { return false }

    let isContained = self.contains(text)
    if isContained { print("\(self) contains \(text)") }
    return isContained
  }
}

Instead of just printing a result, it also returns a Bool indicating whether or not the textField's text was contained in the String. The @discardableResult attribute allows you to ignore the return value if you want to though, without generating a compiler warning.

You could also take a reversed approach, by extending UITextField:

extension UITextField {
  @discardableResult
  func textIsContained(in target: String) -> Bool {
    // Precondition
    guard let text = self.text else { return false }

    let isContained = target.contains(text)
    if isContained { print("\(target) contains \(text)") }
    return isContained
  }
}

You would use these methods as follows:

// Your `UITextField`
let textField = UITextField()
textField.text = "pp"

// String extension:
"apple".containsText(of: textField) // returns `true` and prints "apple contains pp"

// UITextField extension:
textField.textIsContained(in: "apple") // returns `true` and prints "apple contains pp"

Checking if a string contains a text in a textfield

2 Answers2