How to implement a modal date picker? - iphone

Question

I am using code from Ed Marty's answer for the question here but am having real trouble with a few bits.
On the click of a button I have got the datepicker appearing, but the 'done' button however isn't. I am also getting an error from the line:
[delegate datePickerController:controller didPickDate:datePicker.date];
Error message:
'controller' undeclared (first use in this function)
All in all I have 6 files:
ModalDatePickerViewController.m
ModalDatePickerViewController.h
ModalDatePickerAppDelegate.m
ModalDatePickerAppDelegate.h
DatePickerController.m
DatePickerController.h
My DatePickerController.h is looking like:
#import <UIKit/UIKit.h>
#class DatePickerController;
#protocol DatePickerControllerDelegate
- (void) datePickerController:(DatePickerController *)controller didPickDate:(NSDate *)date;
#end
#interface DatePickerController : UIViewController {
UIDatePicker *datePicker;
NSObject <DatePickerControllerDelegate> *delegate;
}
#property (nonatomic, retain) UIDatePicker *datePicker;
#property (nonatomic, assign) NSObject <DatePickerControllerDelegate> *delegate;
#end
and the DatePickerController.m:
#import "DatePickerController.h"
#implementation DatePickerController
#synthesize datePicker;
#synthesize delegate;
- (void) loadView {
self.view = [[[UIView alloc] init] autorelease];
self.datePicker = [[[UIDatePicker alloc] init] autorelease];
[self.view addSubview:self.datePicker];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:#"Done" forState:UIControlStateNormal];
button.center = CGPointMake(160,230);
[button addTarget:self action:#selector(done) forControlEvents:(UIControlEventTouchUpInside)];
[self.view addSubview:button];
}
- (void) done {
[delegate datePickerController:controller didPickDate:datePicker.date];
}
- (void) dealloc {
[datePicker release];
[super dealloc];
}
#end
On the main view I have a button that call this class as below:
#import "ModalDatePickerViewController.h"
#implementation ModalDatePickerViewController
- (void) pickDate {
DatePickerController *screen = [[[DatePickerController alloc] init] autorelease];
screen.delegate = self;
[self presentModalViewController:screen animated:YES];
}
- (void) datePickerController:(DatePickerController *)controller didPickDate:(NSDate *)date {
//[self doSomethingWithDate:date];
[controller dismissModalViewControllerAnimated:YES];
}
- (IBAction)HitMe:(id)sender {
[self pickDate];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (void)viewDidUnload {
}
- (void)dealloc {
[super dealloc];
}
#end
and:
#import <UIKit/UIKit.h>
#import "DatePickerController.h"
#interface ModalDatePickerViewController : UIViewController <DatePickerControllerDelegate> {
}
- (IBAction)HitMe:(id)sender;
#end

Answer 1

On this line:
[delegate datePickerController:controller didPickDate:datePicker.date];
try replacing controller with self.