imagesviewcontroller.m

iphone开发

/*

File: ImagesViewController.m
Abstract: The view controller for hosting the UIImageView containing multiple
images.

Version: 1.7

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*/

#import "ImagesViewController.h"
#import "Constants.h"

@implementation ImagesViewController

#define kMinDuration 0.0
#define kMaxDuration 10.0

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

- (void)dealloc
{
	[imageView release];
	[super dealloc];
}

- (void)loadView
{	
	// setup our parent content view and embed it to your view controller
	UIView *contentView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
	contentView.backgroundColor = [UIColor blackColor];
	contentView.autoresizesSubviews = YES;
	self.view = contentView;
	[contentView release];
	
	// set up our UIImage with a group or array of images to animate (or in our case a slideshow)
	CGRect frame = CGRectMake(	kLeftMargin,
								kTopMargin,
								self.view.bounds.size.width - (kRightMargin * 2.0),
								self.view.bounds.size.height - 240.0);
	imageView = [[UIImageView alloc] initWithFrame:frame];
	imageView.animationImages = [NSArray arrayWithObjects:	[UIImage imageNamed:@"scene1.jpg"],
															[UIImage imageNamed:@"scene2.jpg"],
															[UIImage imageNamed:@"scene3.jpg"],
															[UIImage imageNamed:@"scene4.jpg"],
															[UIImage imageNamed:@"scene5.jpg"], nil];
	imageView.animationDuration = 5.0;
	[imageView stopAnimating];
	[self.view addSubview:imageView];

	// duration slider
	frame = CGRectMake(	kLeftMargin,
						self.view.bounds.size.height - 90.0,
						self.view.bounds.size.width - (kRightMargin * 2.0),
						kSliderHeight);
	UISlider *slider = [[UISlider alloc] initWithFrame:frame];
	[slider addTarget:self action:@selector(sliderAction:) forControlEvents:UIControlEventValueChanged];
	// in case the parent view draws with a custom color or gradient, use a transparent color
	slider.backgroundColor = [UIColor clearColor];
	slider.minimumValue = kMinDuration;
	slider.maximumValue = kMaxDuration;
	slider.continuous = YES;
	slider.value = kMaxDuration / 2.0;
	[self.view addSubview:slider];
    [slider release];
	
	// duration label
	frame = CGRectMake(	kLeftMargin,
						self.view.bounds.size.height - 67.0,
						self.view.bounds.size.width - (kRightMargin * 2.0),
						kLabelHeight);
	UILabel *label = [[UILabel alloc] initWithFrame:frame];
    label.font = [UIFont systemFontOfSize:12.0];
	label.textAlignment = UITextAlignmentCenter;
	label.text = @"Duration";
	label.textColor = [UIColor whiteColor];
	label.backgroundColor = [UIColor clearColor];
	[self.view addSubview:label];
	[label release];
}

// slown down or speed up the slide show as the slider is moved
- (void)sliderAction:(id)sender
{
	UISlider* slider = sender;
	imageView.animationDuration = [slider value];
	if (!imageView.isAnimating)
		[imageView startAnimating];
}


#pragma mark UIViewController delegate methods

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