transitionviewcontroller.m

iphone开发

/*

File: TransitionViewController.m
Abstract: The view controller for showing transitions with UIView.

Version: 1.7

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*/

#import "TransitionViewController.h"
#import "Constants.h"

@implementation TransitionsViewController

#define kImageHeight		200.0
#define kImageWidth			250.0
#define kTransitionDuration	0.75
#define kTopPlacement		80.0	// y coord for the images

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

- (void)dealloc
{
	[mainView release];
	[flipToView release];
	[containerView release];
	
	[super dealloc];
}

// create the alternate view that we flip to.
// In this case, it's almost exactly the same except for differnt photos
//
- (void)createAlternateFlipView
{
	CGRect imageFrame = CGRectMake(0.0, 0.0, kImageWidth, kImageHeight);
	flipToView = [[UIImageView alloc] initWithFrame:imageFrame];
	flipToView.image = [UIImage imageNamed:@"scene2.jpg"];
}

- (void)loadView
{
	// add the top-most parent view
	UIView *contentView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
	contentView.backgroundColor = [UIColor blackColor];
	self.view = contentView;
	[contentView release];
	
	// create the container view which we will use for transition animation (centered horizontally)
	CGRect frame = CGRectMake(round((self.view.bounds.size.width - kImageWidth) / 2.0), kTopPlacement, kImageWidth, kImageHeight);
	containerView = [[UIView alloc] initWithFrame:frame];
	[self.view addSubview:containerView];
	
	// create the initial image view
	frame = CGRectMake(0.0, 0.0, kImageWidth, kImageHeight);
	mainView = [[UIImageView alloc] initWithFrame:frame];
	mainView.image = [UIImage imageNamed:@"scene1.jpg"];
	[containerView addSubview:mainView];
	
	// create the alternate image view (to transition between)
	[self createAlternateFlipView];
	
	// create the buttom toolbar to host the two transition buttons,
	// we will use flex items on both sides to center them
	//
	UIToolbar *toolbar = [UIToolbar new];
	toolbar.barStyle = UIBarStyleBlackOpaque;
	
	UIBarButtonItem *flexItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
																 target:nil
																 action:nil] autorelease];
	UIBarButtonItem *flipItem = [[[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"FlipTitle", @"")
																  style:UIBarButtonItemStyleBordered
																 target:self
																 action:@selector(flipAction:)] autorelease];
	UIBarButtonItem *curlItem = [[[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"CurlTitle", @"")
																  style:UIBarButtonItemStyleBordered
																 target:self
																 action:@selector(curlAction:)] autorelease];
	NSArray *items = [NSArray arrayWithObjects: 
					  flexItem,
							flipItem,
							curlItem,
					  flexItem,
					  nil];
	toolbar.items = items;
	
	// size up the toolbar and set its frame
	[toolbar sizeToFit];
	CGFloat toolbarHeight = [toolbar frame].size.height;
	CGRect mainViewBounds = self.view.bounds;
	[toolbar setFrame:CGRectMake(CGRectGetMinX(mainViewBounds),
								 CGRectGetMinY(mainViewBounds) + CGRectGetHeight(mainViewBounds) - (toolbarHeight * 2.0),
								 CGRectGetWidth(mainViewBounds),
								 toolbarHeight)];
	
	[self.view addSubview:toolbar];
	[toolbar release];
}

- (void)curlAction:(id)sender
{
	[UIView beginAnimations:nil context:NULL];
	[UIView setAnimationDuration:kTransitionDuration];
	
	[UIView setAnimationTransition:([mainView superview] ?
									UIViewAnimationTransitionCurlUp : UIViewAnimationTransitionCurlDown)
						   forView:containerView cache:YES];
	if ([flipToView superview])
	{
		[flipToView removeFromSuperview];
		[containerView addSubview:mainView];
	}
	else
	{
		[mainView removeFromSuperview];
		[containerView addSubview:flipToView];
	}
	
	[UIView commitAnimations];
}

- (void)flipAction:(id)sender
{
	[UIView beginAnimations:nil context:NULL];
	[UIView setAnimationDuration:kTransitionDuration];
		
	[UIView setAnimationTransition:([mainView superview] ?
										UIViewAnimationTransitionFlipFromLeft : UIViewAnimationTransitionFlipFromRight)
										forView:containerView cache:YES];
	if ([flipToView superview])
	{
		[flipToView removeFromSuperview];
		[containerView addSubview:mainView];
	}
	else
	{
		[mainView removeFromSuperview];
		[containerView addSubview:flipToView];
	}
	
	[UIView commitAnimations];
}


#pragma mark UIViewController delegate methods

// called after this controller's view was dismissed, covered or otherwise hidden
- (void)viewWillDisappear:(BOOL)animated
{	
	// 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
{	
	// 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