Max length UITextField

Question

When I\'ve tried How to you set the maximum number of characters that can be entered into a UITextField using swift?, I saw that if I use all 10 characters, I can\'t erase t

Answer 1

you can extend UITextField and add an @IBInspectable object for handle it:

SWIFT 5

import UIKit
private var __maxLengths = [UITextField: Int]()
extension UITextField {
    @IBInspectable var maxLength: Int {
        get {
            guard let l = __maxLengths[self] else {
                return 150 // (global default-limit. or just, Int.max)
            }
            return l
        }
        set {
            __maxLengths[self] = newValue
            addTarget(self, action: #selector(fix), for: .editingChanged)
        }
    }
    @objc func fix(textField: UITextField) {
        if let t = textField.text {
            textField.text = String(t.prefix(maxLength))
        }
    }
}

and after that define it on attribute inspector

See Swift 4 original Answer