A Better Generic Date Picker

I've tweaked my generic date picker class so it matches, pixel-for-pixel, the date picker used by Apple's built-in apps like the Address Book (Contacts.app), and also fixed some bugs in the previous version.



Here is the code that implements it. Use is exactly the same as with the previous version.

Note: if you copied this before about 5:30pm EST, Friday January 23, 2009, you might want to re-copy it. There was a memory leak thanks to me forgetting to release the the date formatter instance.

DateViewController.h

/*
 DateViewController.h
 */

#import <UIKit/UIKit.h>

@protocol DateViewDelegate <NSObject>
@required
- (void)takeNewDate:(NSDate *)newDate;
- (UINavigationController *)navController;          // Return the navigation controller
@end

@interface DateViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
{
    UIDatePicker            *datePicker;
    UITableView             *dateTableView;
    NSDate                  *date;
    
    id <DateViewDelegate>   delegate;   // weak ref
}
@property (nonatomic, retain) UIDatePicker *datePicker;
@property (nonatomic, retain) UITableView *dateTableView;
@property (nonatomic, retain) NSDate *date;
@property (nonatomic, assign)  id <DateViewDelegate> delegate;
-(IBAction)dateChanged;
@end

DateViewController.m

/*
 DateViewController.m
 */
#import "DateViewController.h"

@implementation DateViewController
@synthesize datePicker;
@synthesize dateTableView;
@synthesize date;
@synthesize delegate;

-(IBAction)dateChanged
{
    self.date = [datePicker date];
    [dateTableView reloadData];
}
-(IBAction)cancel
{
    [[self.delegate navController] popViewControllerAnimated:YES];
}
-(IBAction)save
{
    [self.delegate takeNewDate:date];
    [[self.delegate navController] popViewControllerAnimated:YES];
}
- (void)loadView
{
    UIView *theView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.view = theView;
    [theView release];

    UITableView *theTableView = [[UITableView alloc] initWithFrame:CGRectMake(0.0, 67.0, 320.0, 480.0) style:UITableViewStyleGrouped];
    theTableView.delegate = self;
    theTableView.dataSource = self;
    [self.view addSubview:theTableView];
    self.dateTableView = theTableView;
    [theTableView release];
    
    UIDatePicker *theDatePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0.0, 200.0, 320.0, 216.0)];
    theDatePicker.datePickerMode = UIDatePickerModeDate;
    self.datePicker = theDatePicker;
    [theDatePicker release];
    [datePicker addTarget:self action:@selector(dateChanged) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:datePicker];
    

    
    
    UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc]
                                     initWithTitle:NSLocalizedString(@"Cancel", @"Cancel - for button to cancel changes")
                                     style:UIBarButtonItemStylePlain
                                     target:self
                                     action:@selector(cancel)];
    self.navigationItem.leftBarButtonItem = cancelButton;
    [cancelButton release];
    UIBarButtonItem *saveButton = [[UIBarButtonItem alloc]
                                   initWithTitle:NSLocalizedString(@"Save", @"Save - for button to save changes")
                                   style:UIBarButtonItemStylePlain
                                   target:self
                                   action:@selector(save)];
    self.navigationItem.rightBarButtonItem = saveButton;
    [saveButton release];
    
    self.view.backgroundColor = [UIColor groupTableViewBackgroundColor];
    
}

- (void)viewWillAppear:(BOOL)animated
{
    if (self.date != nil)
        [self.datePicker setDate:date animated:YES];
    else 
        [self.datePicker setDate:[NSDate date] animated:YES];
    
    [super viewWillAppear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

- (void)dealloc 
    {
    [datePicker release];
    [dateTableView release];
    [date release];
    [super dealloc];
}
#pragma mark -
#pragma mark Table View Methods
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    
    static NSString *DateCellIdentifier = @"DateCellIdentifier";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:DateCellIdentifier];
    if (cell == nil) 
    {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:DateCellIdentifier] autorelease];
        cell.font = [UIFont systemFontOfSize:17.0];
        cell.textColor = [UIColor colorWithRed:0.243 green:0.306 blue:0.435 alpha:1.0];
    }
    
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"MMMM dd, yyyy"];
    cell.text = [formatter stringFromDate:date];
    [formatter release];

    
    return cell;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 1;   
}
@end