Keep UIAlertView displayed - objective-c

Question

I have a UIAlertView with a textField on it and two buttons: Save & Cancel. When the Save button is tapped I am checking if the text field isn't empty and after if it is I simply want to change the textFields placeholder to: #"enter a name please" and KEEP the alert view on screen. However it is automatically dismissed.
How do I override that?

Answer 1

Add a target to the textfield in a subclassed alertView. You can subclass the alertView and not dismiss as described in this post
[[alertView textFieldAtIndex:0] addTarget:self action:#selector(textFieldDidChange) forControlEvents:UIControlEventEditingChanged];
Then write a function called textFieldDidChange that checks the current textfield of your alertView and set a boolean value so you know whether or not to dismiss the alert.
- (void) textFieldDidChange
{
NSString *alertViewText = [[alertView textFieldAtIndex:0] text];
if ([alertViewText isEqualToString:#""]) {
[alertView setMessage:#"Enter a name please."];
} else {
[alertView setMessage:#"Default Message"];
}
}
* Alternatively, I would suggest disabling "Save" when it is empty and not have to subclass. *
- (void) textFieldDidChange
{
NSString *alertViewText = [[alertView textFieldAtIndex:0] text];
if ([alertViewText isEqualToString:#""]) {
[alertView setMessage:#"Enter a name please."];
for (UIViewController *view in alertView.subview) {
if ([view isKindOfClass:[UIButton class]]) {
UIButton *button = (UIButton *)view;
if ([[[button titleLabel] text] isEqualToString:#"Save"])
[button setEnabled:NO];
}
}
} else {
[alertView setMessage:#"Default Message"];
for (UIViewController *view in alertView.subview) {
if ([view isKindOfClass:[UIButton class]]) {
UIButton *button = (UIButton *)view;
if ([[[button titleLabel] text] isEqualToString:#"Save"])
[button setEnabled:YES];
}
}
}
}