pickerviewcontroller.m

GLPaint example code from the iphone SDK

/*

File: PickerViewController.m
Abstract: The view controller for hosting the UIPickerView of this sample.

Version: 1.7

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*/

#import "PickerViewController.h"
#import "CustomPicker.h"
#import "Constants.h"

@implementation PickerViewController

- (id)init
{
	self = [super init];
	if (self)
	{
		// this title will appear in the navigation bar
		self.title = NSLocalizedString(@"PickerTitle", @"");
	}
	
	return self;
}

// return the picker frame based on its size, positioned at the bottom of the page
- (CGRect)pickerFrameWithSize:(CGSize)size
{
	CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
	CGRect pickerRect = CGRectMake(	0.0,
									screenRect.size.height - kToolbarHeight - 44.0 - size.height,
									size.width,
									size.height);
	return pickerRect;
}

#pragma mark 
#pragma mark UIPickerView
#pragma mark
- (void)createPicker
{
	pickerViewArray = [[NSArray arrayWithObjects:
							@"John Appleseed", @"Chris Armstrong", @"Serena Auroux",
							@"Susan Bean", @"Luis Becerra", @"Kate Bell", @"Alain Briere",
							nil] retain];
	// note we are using CGRectZero for the dimensions of our picker view,
	// this is because picker views have a built in optimum size,
	// you just need to set the correct origin in your view.
	//
	// position the picker at the bottom
	myPickerView = [[UIPickerView alloc] initWithFrame:CGRectZero];
	CGSize pickerSize = [myPickerView sizeThatFits:CGSizeZero];
	myPickerView.frame = [self pickerFrameWithSize:pickerSize];

	myPickerView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
	myPickerView.delegate = self;
	myPickerView.showsSelectionIndicator = YES;	// note this is default to NO
	
	// add this picker to our view controller, initially hidden
	myPickerView.hidden = YES;
	[self.view addSubview:myPickerView];
}

#pragma mark 
#pragma mark UIPickerView - Date/Time
#pragma mark
- (void)createDatePicker
{
	datePickerView = [[UIDatePicker alloc] initWithFrame:CGRectZero];
	datePickerView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
	datePickerView.datePickerMode = UIDatePickerModeTime;
	
	// note we are using CGRectZero for the dimensions of our picker view,
	// this is because picker views have a built in optimum size,
	// you just need to set the correct origin in your view.
	//
	// position the picker at the bottom
	CGSize pickerSize = [myPickerView sizeThatFits:CGSizeZero];
	datePickerView.frame = [self pickerFrameWithSize:pickerSize];
	
	// add this picker to our view controller, initially hidden
	datePickerView.hidden = YES;
	[self.view addSubview:datePickerView];
}

#pragma mark 
#pragma mark UIPickerView - Custom Picker
#pragma mark
- (void)createCustomPicker
{
	customPickerView = [[CustomPicker alloc] initWithFrame:CGRectZero];
	customPickerView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
	
	// note we are using CGRectZero for the dimensions of our picker view,
	// this is because picker views have a built in optimum size,
	// you just need to set the correct origin in your view.
	//
	// position the picker at the bottom
	CGSize pickerSize = [myPickerView sizeThatFits:CGSizeZero];
	customPickerView.frame = [self pickerFrameWithSize:pickerSize];
	
	customPickerView.showsSelectionIndicator = YES;
	
	// add this picker to our view controller, initially hidden
	customPickerView.hidden = YES;
	[self.view addSubview:customPickerView];
}

- (void)showPicker:(UIView *)picker
{
	// hide the current picker and show the new one
	if (currentPicker)
	{
		currentPicker.hidden = YES;
		label.text = @"";
	}
	picker.hidden = NO;
	
	currentPicker = picker;	// remember the current picker so we can remove it later when another one is chosen
}

- (void)createButtonBar
{
	// create the button bar
	buttonBar = [UIToolbar new];
	buttonBar.barStyle = UIBarStyleBlackOpaque;
	
	// position the button bar's frame
	CGFloat toolbarHeight = kToolbarHeight + 4.0;
	CGRect mainViewBounds = self.view.bounds;
	[buttonBar setFrame:CGRectMake(CGRectGetMinX(mainViewBounds),
								   CGRectGetMinY(mainViewBounds) + CGRectGetHeight(mainViewBounds) - (toolbarHeight * 2.0),
								   CGRectGetWidth(mainViewBounds),
								   toolbarHeight)];
	
	// add a segmented control to the button bar
	buttonBarSegmentedControl = [[UISegmentedControl alloc] initWithItems:
									[NSArray arrayWithObjects:@"UIPicker", @"UIDatePicker", @"Custom", nil]];
	[buttonBarSegmentedControl addTarget:self action:@selector(togglePickers:) forControlEvents:UIControlEventValueChanged];
	buttonBarSegmentedControl.selectedSegmentIndex = 0.0;	// start by showing the normal picker
	buttonBarSegmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
    buttonBarSegmentedControl.tintColor = [UIColor darkGrayColor];
	buttonBarSegmentedControl.backgroundColor = [UIColor clearColor];

	UIBarButtonItem *segItem = [[UIBarButtonItem alloc] initWithCustomView:buttonBarSegmentedControl];	
	buttonBar.items = [NSArray arrayWithObject:segItem];
	[segItem release];
	
	[self.view addSubview:buttonBar];
	
	CGRect buttonBarFrame = [buttonBar frame];
	CGRect segmentedControlFrame = CGRectMake(kLeftMargin,
											  kTopMargin,
											  buttonBarFrame.size.width - kLeftMargin,
											  30.0);
    buttonBarSegmentedControl.frame = segmentedControlFrame;
	
	// start by showing the normal picker
	buttonBarSegmentedControl.selectedSegmentIndex = 0.0;
}	

- (void)loadView
{		
	CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
	
	// setup our parent content view and embed it to your view controller
	UIView *contentView = [[UIView alloc] initWithFrame:screenRect];
	contentView.backgroundColor = [UIColor blackColor];
	contentView.autoresizesSubviews = YES;
	contentView.autoresizingMask = UIViewAutoresizingFlexibleWidth;
	
	self.view = contentView;
	[contentView release];
	
	[self createPicker];	
	[self createDatePicker];
	[self createCustomPicker];
	
	[self createButtonBar];
	
	// label for picker selection output, place it right above the picker
	CGRect labelFrame = CGRectMake(	kLeftMargin,
									myPickerView.frame.origin.y - kTextFieldHeight,
									self.view.bounds.size.width - (kRightMargin * 2.0),
									kTextFieldHeight);
	label = [[UILabel alloc] initWithFrame:labelFrame];
    label.font = [UIFont systemFontOfSize: 14];
	label.textAlignment = UITextAlignmentCenter;
	label.textColor = [UIColor whiteColor];
	label.backgroundColor = [UIColor clearColor];
	[self.view addSubview:label];
	
	// create the segmented control to control the UIDatePicker's style (date/time/datetime)
	pickerStyleSegmentedControl = [[UISegmentedControl alloc] initWithItems:
										[NSArray arrayWithObjects:@"1", @"2", @"3", @"4", nil]];
	[pickerStyleSegmentedControl addTarget:self action:@selector(togglePickerStyle:) forControlEvents:UIControlEventValueChanged];
	pickerStyleSegmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
	pickerStyleSegmentedControl.tintColor = [UIColor darkGrayColor];
    pickerStyleSegmentedControl.backgroundColor = [UIColor clearColor];
	[pickerStyleSegmentedControl sizeToFit];
	pickerStyleSegmentedControl.hidden = YES;
	
	CGRect segmentedControlFrame = CGRectMake(kRightMargin,
											  kTopMargin + kTextFieldHeight + 5,
											  screenRect.size.width - (kRightMargin * 2.0),
											  kSegmentedControlHeight);
    pickerStyleSegmentedControl.frame = segmentedControlFrame;
	[self.view addSubview:pickerStyleSegmentedControl];
	
	// create the selection label for our UIDatePicker segmented control
	labelFrame = CGRectMake(0,
							kTopMargin,
							self.view.bounds.size.width,
							kTextFieldHeight);
	segmentLabel = [[UILabel alloc] initWithFrame:labelFrame];
    segmentLabel.font = [UIFont systemFontOfSize: 14];
	segmentLabel.textAlignment = UITextAlignmentCenter;
	segmentLabel.textColor = [UIColor whiteColor];
	segmentLabel.backgroundColor = [UIColor clearColor];
	segmentLabel.hidden = YES;
	[self.view addSubview:segmentLabel];
	
	// start by showing the normal picker
	buttonBarSegmentedControl.selectedSegmentIndex = 0.0;
}

- (void)dealloc
{
	[pickerViewArray release];
	[myPickerView release];
	[datePickerView release];
	[label release];
	[customPickerView release];
	
	[pickerStyleSegmentedControl release];
	[segmentLabel release];
	
	[buttonBarSegmentedControl release];
	[buttonBar release];
	
	[super dealloc];
}

- (void)togglePickerStyle:(id)sender
{
	UISegmentedControl *segControl = sender;
	switch (segControl.selectedSegmentIndex)
	{
		case 0:	// Time
		{
			datePickerView.datePickerMode = UIDatePickerModeTime;
			segmentLabel.text = @"UIDatePickerModeTime";
			break;
		}
		case 1: // Date
		{	
			datePickerView.datePickerMode = UIDatePickerModeDate;
			segmentLabel.text = @"UIDatePickerModeDate";
			break;
		}
		case 2:	// Date & Time
		{
			datePickerView.datePickerMode = UIDatePickerModeDateAndTime;
			segmentLabel.text = @"UIDatePickerModeDateAndTime";
			break;
		}
		case 3:	// Counter
		{
			datePickerView.datePickerMode = UIDatePickerModeCountDownTimer;
			segmentLabel.text = @"UIDatePickerModeCountDownTimer";
			break;
		}
	}
	
	// in case we previously chose the Counter style picker, make sure
	// the current date is restored
	NSDate *today = [NSDate date];
	datePickerView.date = today;
}

- (void)togglePickers:(id)sender
{
	UISegmentedControl *segControl = sender;
	switch (segControl.selectedSegmentIndex)
	{
		case 0:	// UIPickerView
		{
			pickerStyleSegmentedControl.hidden = YES;
			segmentLabel.hidden = YES;
			[self showPicker:myPickerView];
			break;
		}
		case 1: // UIDatePicker
		{	
			// start by showing the time picker
			
			// initially set the picker style to "time" format
			pickerStyleSegmentedControl.selectedSegmentIndex = 0.0;
			pickerStyleSegmentedControl.hidden = NO;
			segmentLabel.hidden = NO;
			[self showPicker:datePickerView];
			break;
		}
	
		case 2:	// Custom
		{
			pickerStyleSegmentedControl.hidden = YES;
			segmentLabel.hidden = YES;
			[self showPicker:customPickerView];	
			break;
		}
	}
}

- (void)pickerAction:(id)sender
{
	if (myPickerView != currentPicker)
		[self showPicker:myPickerView];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
	// if you want to only support portrait mode, do this
	//return (interfaceOrientation == UIInterfaceOrientationPortrait);
	
	return YES;
}


#pragma mark -
#pragma mark PickerView delegate methods

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
	// report the selection to the UI label
	label.text = [NSString stringWithFormat:@"%@ - %d",
		[pickerViewArray objectAtIndex:[pickerView selectedRowInComponent:0]], [pickerView selectedRowInComponent:1]];
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
	NSString *returnStr;
	if (component == 0)
	{
		returnStr = [pickerViewArray objectAtIndex:row];
	}
	else
	{
		returnStr = [[NSNumber numberWithInt:row] stringValue];
	}
	return returnStr;
}

- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
{
	CGFloat componentWidth;
	if (component == 0)
		componentWidth = 240.0;	// first column size is wider to hold names
	else
		componentWidth = 40.0;	// second column is narrower to show numbers
	return componentWidth;
}

- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
	return 40.0;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
	return [pickerViewArray count];
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
	return 2;
}


#pragma mark UIViewController delegate methods

// called after this controller's view was dismissed, covered or otherwise hidden
- (void)viewWillDisappear:(BOOL)animated
{
	currentPicker.hidden = YES;
	
	// restore the nav bar and status bar color to default
	self.navigationController.navigationBar.barStyle = UIBarStyleDefault;
	[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault;
}

// called after this controller's view will appear
- (void)viewWillAppear:(BOOL)animated
{
	[self togglePickers:buttonBarSegmentedControl];	// make sure the last picker is still showing
	
	// for aesthetic reasons (the background is black), make the nav bar black for this particular page
	self.navigationController.navigationBar.barStyle = UIBarStyleBlackOpaque;
	
	// match the status bar with the nav bar
	[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlackOpaque;
}

@end