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Summary:
When displaying a UIAlertView with a UITextField in iOS 7, the "alertViewShouldEnableFirstOtherButton:" method is never called when a change is made to the UITextField.

Steps to Reproduce:
1. Open Xcode
2. Create a new "Single View Application"
3. Open "ViewController.m"
4. In the "viewDidLoad" method, instantiate a UIAlertView, and set its "alertViewStyle" to "UIAlertViewStylePlainTextInput"
5. Implement the UIAlertViewDelegate "alertViewShouldEnableFirstOtherButton:" method in the view controller
6. Build and Run the Xcode project
7. Input some text into the UITextField

Expected Results:
The UIAlertViewDelegate "alertViewShouldEnableFirstOtherButton:" method should be called whenever a change is made to the UITextField.

Actual Results:
The UIAlertViewDelegate "alertViewShouldEnableFirstOtherButton:" method is never called.

Regression:
The expected result still functions in iOS 6, but is not working in iOS 7.

Notes:
Below is an example of the code required to reproduce the bug.

- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView {
	NSLog(@"alertViewShouldEnableFirstOtherButton: was called!");
	return YES;
}

- (void)viewDidLoad {
	[super viewDidLoad];
	
	// Do any additional setup after loading the view, typically from a nib.
	UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"I’m an alert view!" message:nil delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Next", nil];
	[alertView setAlertViewStyle:UIAlertViewStylePlainTextInput];
	[[alertView textFieldAtIndex:0] setDelegate:self];
	[alertView show];
}