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    <h2>Swift 4:</h2> <hr> <p>Subclass <code>UITextField</code>:</p> <pre><code>// MyTextField.swift import UIKit protocol MyTextFieldDelegate { func textFieldDidDelete() } class MyTextField: UITextField { var myDelegate: MyTextFieldDelegate? override func deleteBackward() { super.deleteBackward() myDelegate?.textFieldDidDelete() } } </code></pre> <p>Implementation:</p> <pre><code>// ViewController.swift import UIKit class ViewController: UIViewController, MyTextFieldDelegate { override func viewDidLoad() { super.viewDidLoad() // initialize textField let input = MyTextField(frame: CGRect(x: 50, y: 50, width: 150, height: 40)) // set viewController as "myDelegate" input.myDelegate = self // add textField to view view.addSubview(input) // focus the text field input.becomeFirstResponder() } func textFieldDidDelete() { print("delete") } } </code></pre> <hr> <h2>Objective-C:</h2> <hr> <p>Subclass <code>UITextField</code>:</p> <pre><code>//Header //MyTextField.h //create delegate protocol @protocol MyTextFieldDelegate &lt;NSObject&gt; @optional - (void)textFieldDidDelete; @end @interface MyTextField : UITextField&lt;UIKeyInput&gt; //create "myDelegate" @property (nonatomic, assign) id&lt;MyTextFieldDelegate&gt; myDelegate; @end //Implementation #import "MyTextField.h" @implementation MyTextField - (void)deleteBackward { [super deleteBackward]; if ([_myDelegate respondsToSelector:@selector(textFieldDidDelete)]){ [_myDelegate textFieldDidDelete]; } } @end </code></pre> <p>Now simply add <strong>MyTextFieldDelegate</strong> to your <code>UIViewController</code> and set your <code>UITextFields</code> <strong>myDelegate</strong> to <code>self</code>:</p> <pre><code>//View Controller Header #import "MyTextField.h" //add "MyTextFieldDelegate" to you view controller @interface ViewController : UIViewController &lt;MyTextFieldDelegate&gt; @end //View Controller Implementation - (void)viewDidLoad { //initialize your text field MyTextField *input = [[MyTextField alloc] initWithFrame:CGRectMake(0, 0, 70, 30)]; //set your view controller as "myDelegate" input.myDelegate = self; //add your text field to the view [self.view addSubview:input]; } //MyTextField Delegate - (void)textFieldDidDelete { NSLog(@"delete"); } </code></pre>
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    1. USJacob Caraballo
    1. USJacob Caraballo
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      1. VTUpMod
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    1. COThis is the best solution. The answer accepted is a hack. Objective C is based on sub classing and this solution uses it properly to solve the problem.
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    2. COSadly, this only works for >= iOS 6 though
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      1. USjaetzold
 

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