Change UITextField background when editing begins

Question

I\'d like to change the background image of a UITextField when it becomes the firstResponder to show the user that it has focus, similar to the :active or :focus pseudo-clas

Answer 1

You can probably try observing for changes to isFirstResponder. and changing the background in the notification method. Something like:

[textField addObserver:theObserver forKeyPath:@"isFirstResponder" options:0 context:nil];

Then in the observer:

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    if(object == textField && [keyPath isEqual:@"isFirstResponder"]) {
        //fiddle with object here
    }
}