fíam

/* UIDatePickerViewController.h */
#import <UIKit/UIKit.h>

@class UIDatePickerController;

@protocol UIDatePickerControllerDelegate

@required
- (void)datePickerControllerCancelled:(UIDatePickerController *)picker;
- (void)datePickerControllerSaved:(UIDatePickerController *)picker withDate:(NSDate *)theDate;

@end

@interface UIDatePickerController : UIViewController <UITableViewDelegate, UITableViewDataSource> {
    UIDatePicker *_picker;
    UITableViewCell *_cell;
    UITableView *_tableView;
    NSDateFormatter *_formatter;
    id <NSObject, UIDatePickerControllerDelegate> _delegate;
}

@property(nonatomic, readonly) UIDatePicker *picker;
@property(nonatomic, readonly) NSDateFormatter *formatter;
@property(nonatomic, retain) NSDate *date;
@property(nonatomic, assign) id <NSObject, UIDatePickerControllerDelegate> delegate;

@end

/* UIDatePickerViewController.m */
#import <QuartzCore/QuartzCore.h>

#import "UIDatePickerController.h"


@implementation UIDatePickerController

@synthesize picker = _picker;
@synthesize formatter = _formatter;
@synthesize delegate = _delegate;

- (id)init {
    if (self = [super init]) {
        _picker = [[UIDatePicker alloc] initWithFrame:CGRectZero];
        [_picker addTarget:self action:@selector(dateDidChange:) forControlEvents:UIControlEventValueChanged];
        _tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStyleGrouped];
        _formatter = [NSDateFormatter new];

        _tableView.delegate = self;
        _tableView.dataSource = self;
    }

    return self;
}

#pragma mark properties

- (NSDate *)date {
    return _picker.date;
}

- (void)setDate:(NSDate *)theDate {
    _picker.date = theDate;
}

- (void)loadView {
    [super loadView];

    self.view.backgroundColor = [UIColor groupTableViewBackgroundColor];
    [self.view addSubview:_picker];
    [self.view addSubview:_tableView];

    UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                                                                                  target:self action:@selector(cancel)];
    self.navigationItem.leftBarButtonItem = cancelButton;
    [cancelButton release];
    UIBarButtonItem *saveButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSave
                                                                                target:self action:@selector(save)];
    self.navigationItem.rightBarButtonItem = saveButton;
    [saveButton release];
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    CGFloat pickerYOrigin = CGRectGetMaxY(self.view.layer.visibleRect) - CGRectGetHeight(_picker.frame);
    _picker.frame = CGRectMake(0, pickerYOrigin, CGRectGetWidth(_picker.frame), CGRectGetHeight(_picker.frame));

    CGFloat viewYOrigin = CGRectGetMinX(self.view.bounds);
    CGFloat tableHeight = 65;
    CGFloat tableYOrigin = viewYOrigin + (pickerYOrigin - viewYOrigin - tableHeight) / 2;
    _tableView.frame = CGRectMake(0, tableYOrigin, CGRectGetWidth(self.view.frame), tableHeight);
}

#pragma mark Table view methods

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    if (_cell == nil) {
        _cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:nil] autorelease];
        _cell.font = [UIFont systemFontOfSize:17.0];
        _cell.textColor = [UIColor colorWithRed:62/255.0 green:78/255.0 blue:111/255.0 alpha:1.0];
        _cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }

    _cell.text = [_formatter stringFromDate:_picker.date];

    return _cell;
}

- (void)dealloc {
    [_picker release];
    [_tableView release];
    [_formatter release];
    [super dealloc];
}

- (void)save {
    [_delegate datePickerControllerSaved:self withDate:_picker.date];
}

- (void)cancel {
    [_delegate datePickerControllerCancelled:self];
}

- (void)dateDidChange:(UIDatePicker *)picker {
    _cell.text = [_formatter stringFromDate:picker.date];
}

@end