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swiftuitextfielduitextfielddelegate

TextField delegate shouldChangeCharactersInRange

Why doesn't the shouldChangeCharactersInRange update the textfield right away. It is 1 delayed by one character.

For example, download this file: https://www.dropbox.com/s/goljs3d6lcxutxy/UITextField%20Tutorial.zip?dl=0

add the following code to 

func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {

method

print(textField.text)

see how it is delayed by one character. I want it to be updated as I type the text not one delayed.

Solution

  • That method is asking you if it should take the replacementString and add it onto textField.text. It is called immediately after you press a key on the keyboard and before letter appears on screen.

    To see what the new string will be, you'd need to to something like this.

    let newText = textField.text.stringByReplacingCharactersInRange(range, withString: string)
print(newText)