Undo/redo with a UITextView (iOS/iPHone)

Question

I have a view where a UITextView always has focus. What I want to do is extend the built-in undo/redo behavior to support undo/redo for when I programmatically set the text

Answer 1

You can change your textview to whatever text you want and preserve undo and redo manager's memory stacks. self.content is UITextView.

-(void) yourClearAllButtonIsPressed
{
    [[self.content.undoManager prepareWithInvocationTarget:self] undoClear:self.content.text];
    [self.content setText:@""];//Or something else you want to change your textview to
}

}

//just one, my method I created

-(void) undoClearBlablabla:(NSString*) text
    {
        [[self.content.undoManager prepareWithInvocationTarget:self] undoClear:self.content.text];
        [self.content setText:text];
    }