<p>How do you add that little "X" button on the right side of a UITextField that clears the text?  I can't find an attribute for adding this sub-control in Interface Builder in the iPhone OS 2.2 SDK.</p>

<p><strong>Note:</strong> In Xcode 4.x and later (iPhone 3.0 SDK and later), you can do this in Interface Builder.</p>

This button is a built-in overlay that is provided by the
```
UITextField
```
class, but as of the iOS 2.2 SDK, there isn't any way to set it via Interface Builder.  You have to enable it programmatically.
Add this line of code somewhere (
```
viewDidLoad
```
, for example):
Objective-C
```
```
myUITextField.clearButtonMode = UITextFieldViewModeWhileEditing;
```
```
Swift 5.0
```
```
myUITextField.clearButtonMode = .whileEditing
```
```