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    <p><strong>Shake-to-undo</strong><br> Put this line in your appDelegate's <code>application:didFinishLaunchingWithOptions:</code> method:</p> <pre><code> application.applicationSupportsShakeToEdit = YES; </code></pre> <p>and in the relevant viewController.m</p> <pre><code> -(BOOL)canBecomeFirstResponder { return YES; } </code></pre> <p>the rest of this code goes in viewController.m</p> <p><strong>Property</strong><br> Put this in the class extension...</p> <pre><code> @interface myViewController() @property (weak, nonatomic) IBOutlet UITextField *inputTextField; @end </code></pre> <p>link it up to your text field in Interface Builder.</p> <p><strong>Undo method</strong><br> Adds an invocation of itself to the redo stack</p> <pre><code> - (void)undoTextFieldEdit: (NSString*)string { [self.undoManager registerUndoWithTarget:self selector:@selector(undoTextFieldEdit:) object:self.inputTextField.text]; self.inputTextField.text = string; } </code></pre> <p>(we do not need to create an NSUndoManager instance, we inherit one from the UIResponder superclass)</p> <p><strong>Undo actions</strong><br> Not required for shake-to-undo, but could be useful...</p> <pre><code> - (IBAction)undo:(id)sender { [self.undoManager undo]; } - (IBAction)redo:(id)sender { [self.undoManager redo]; } </code></pre> <p><strong>Invocations of the undo method</strong><br> Here are two different examples of changing the textField's contents…</p> <p><em>Example 1</em><br> Set the textField's contents from a button action</p> <pre><code> - (IBAction)addLabelText:(UIButton*)sender { [self.undoManager registerUndoWithTarget:self selector:@selector(undoTextFieldEdit:) object:self.inputTextField.text]; self.inputTextField.text = @"text"; } </code></pre> <p>Risking loss of clarity, we can shorten this to:</p> <pre><code> - (IBAction)addLabelText:(UIButton*)sender { [self undoTextFieldEdit: @"text"]; } </code></pre> <p>as the undoManager invocation is the same in both methods</p> <p><em>Example 2</em><br> Direct keyboard input editing</p> <pre><code> #pragma mark - textField delegate methods - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField { [self.undoManager registerUndoWithTarget:self selector:@selector(undoTextFieldEdit:) object:textField.text]; return YES; } - (BOOL)textFieldShouldReturn:(UITextField *)textField { //to dismiss the keyboard [textField resignFirstResponder]; return YES; } </code></pre>
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    1. COI tried this but it didn't work. Maybe it's because the viewController is a UITableViewCell? I added the code I've used so far. And I also did add the shaketoedit to the appDelegate. When I add the "canBecomeFirstResponder" it no longer supports shake to undo for the cell.
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    2. CO@Hackmodford: "Maybe it's because the viewController is a UITableViewCell?" ...that sounds a little... impossible... do you mean, the _textField_ is in a table view cell? Or do you mean that you have a viewController that controls the contentView of each tableViewCell? Or...?
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    3. CO@Hackmodford, I have tested this code with the textField inside a `UITableViewCell` in a static table. It just works. All of the code that is not in the App Delegate is in the `TableViewController`. The textField has to have two connections to the `TableViewController` - (1) `delegate` is the TableVC; (2) IBOutlet is `self.inputTextField` (or in your case `customTextField`). `canBecomeFirstResponder` is in the TableViewController and works fine.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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