phonegap-plugins/iOS/DatePicker/DatePicker.m

//	Phonegap DatePicker Plugin
//	Copyright (c) Greg Allen 2011
//	MIT Licensed
//
//  Additional refactoring by Sam de Freyssinet

#import "DatePicker.h"

@interface DatePicker (Private)

// Initialize the UIActionSheet with ID <UIActionSheetDelegate> delegate UIDatePicker datePicker (UISegmentedControl)closeButton
- (void)initActionSheet:(id <UIActionSheetDelegate>)delegateOrNil datePicker:(UIDatePicker *)datePicker closeButton:(UISegmentedControl *)closeButton;

// Creates the NSDateFormatter with NSString format and NSTimeZone timezone
- (NSDateFormatter *)createISODateFormatter:(NSString *)format timezone:(NSTimeZone *)timezone;

// Creates the UIDatePicker with NSMutableDictionary options
- (UIDatePicker *)createDatePicker:(CGRect)pickerFrame;

// Creates the UISegmentedControl with UIView parentView, NSString title, ID target and SEL action
- (UISegmentedControl *)createActionSheetCloseButton:(NSString *)title target:(id)target action:(SEL)action;

// Configures the UIDatePicker with the NSMutableDictionary options
- (void)configureDatePicker:(NSMutableDictionary *)optionsOrNil;

@end

@implementation DatePicker

@synthesize datePickerSheet = _datePickerSheet;
@synthesize datePicker = _datePicker;
@synthesize isoDateFormatter = _isoDateFormatter; 

#pragma mark - Public Methods

- (CDVPlugin *)initWithWebView:(UIWebView *)theWebView
{
	self = (DatePicker *)[super initWithWebView:theWebView];

	if (self)
	{
		UIDatePicker *userDatePicker = [self createDatePicker:CGRectMake(0, 40, 0, 0)];
		UISegmentedControl *datePickerCloseButton = [self createActionSheetCloseButton:@"Close" target:self action:@selector(dismissActionSheet:)];
		NSDateFormatter *isoTimeFormatter = [self createISODateFormatter:k_DATEPICKER_DATETIME_FORMAT timezone:[NSTimeZone defaultTimeZone]];

		self.datePicker = userDatePicker;
		self.isoDateFormatter = isoTimeFormatter;

		[self initActionSheet:self datePicker:userDatePicker closeButton:datePickerCloseButton];        
	}

	return self;
}

- (void)show:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options
{
	if (isVisible) {
		return;        
	}

	[self configureDatePicker:options];
	[self.datePickerSheet showInView:[[super webView] superview]];	
	[self.datePickerSheet setBounds:CGRectMake(0, 0, 320, 485)];

	isVisible = YES;
}

- (void)dismissActionSheet:(id)sender {
	[self.datePickerSheet dismissWithClickedButtonIndex:0 animated:YES];
}

- (void)onMemoryWarning
{
	// It could be better to close the datepicker before the system
	// clears memory. But in reality, other non-visible plugins should
	// be tidying themselves at this point. This could cause a fatal
	// at runtime.
	if (isVisible) {
		return;
	}

	[self release];
}

- (void)dealloc
{
	[_datePicker release];
	[_datePickerSheet release];
	[_isoDateFormatter release];

	[super dealloc];
}

#pragma mark - UIActionSheetDelegate methods

- (void)actionSheet:(UIActionSheet *)actionSheet willDismissWithButtonIndex:(NSInteger)buttonIndex
{
	NSString* jsCallback = [NSString stringWithFormat:@"window.plugins.datePicker._dateSelected(\"%i\");", (int)[self.datePicker.date timeIntervalSince1970]];
	[super writeJavascript:jsCallback];
}

- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{
	isVisible = NO;
}

#pragma mark - Private Methods

- (void)initActionSheet:(id <UIActionSheetDelegate>)delegateOrNil datePicker:(UIDatePicker *)datePicker closeButton:(UISegmentedControl *)closeButton
{
	UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil
															 delegate:delegateOrNil 
													cancelButtonTitle:nil 
											   destructiveButtonTitle:nil 
													otherButtonTitles:nil];

	[actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];

	[actionSheet addSubview:datePicker];
	[actionSheet addSubview:closeButton];

	self.datePickerSheet = actionSheet;

	[actionSheet release];
}

- (UIDatePicker *)createDatePicker:(CGRect)pickerFrame
{
	UIDatePicker *datePickerControl = [[UIDatePicker alloc] initWithFrame:pickerFrame];
	return [datePickerControl autorelease];
}

- (NSDateFormatter *)createISODateFormatter:(NSString *)format timezone:(NSTimeZone *)timezone;
{
	NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
	[dateFormatter setTimeZone:timezone];
	[dateFormatter setDateFormat:format];

	return [dateFormatter autorelease];
}

- (UISegmentedControl *)createActionSheetCloseButton:(NSString *)title target:(id)target action:(SEL)action
{
	UISegmentedControl *closeButton = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObject:title]];

	closeButton.momentary = YES; 
	closeButton.frame = CGRectMake(260, 7.0f, 50.0f, 30.0f);
	closeButton.segmentedControlStyle = UISegmentedControlStyleBar;
	closeButton.tintColor = [UIColor blackColor];

	[closeButton addTarget:target action:action forControlEvents:UIControlEventValueChanged];

	return [closeButton autorelease];
}

- (void)configureDatePicker:(NSMutableDictionary *)optionsOrNil;
{
 	NSString *mode = [optionsOrNil objectForKey:@"mode"];
	NSString *dateString = [optionsOrNil objectForKey:@"date"];
	BOOL allowOldDates = NO;
	BOOL allowFutureDates = YES;

	if ([[optionsOrNil objectForKey:@"allowOldDates"] intValue] == 1) {
		allowOldDates = YES;
	}

	if ( ! allowOldDates) {
		self.datePicker.minimumDate = [NSDate date];
	}
	
	if ([[optionsOrNil objectForKey:@"allowFutureDates"] intValue] == 0) {
		allowFutureDates = NO;
	}

	if ( ! allowFutureDates) {
		self.datePicker.maximumDate = [NSDate date];
	}

	self.datePicker.date = [self.isoDateFormatter dateFromString:dateString];

	if ([mode isEqualToString:@"date"]) {
		self.datePicker.datePickerMode = UIDatePickerModeDate;
	}
	else if ([mode isEqualToString:@"time"])
	{
		self.datePicker.datePickerMode = UIDatePickerModeTime;
	}
	else
	{
		self.datePicker.datePickerMode = UIDatePickerModeDateAndTime;
	}
}

@end