实现图片Carousel效果代码,ObjC代码库,德仔网

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【ObjC】实现图片Carousel效果

作者:万鑫 / 发布于2014/11/15/ 367

Carousel效果也叫Cover Flow效果，就是图片以3D的形式进行左右滑动。


	//
	// Carousel.h
	//
	
	#import <UIKit/UIKit.h>
	
	@interface Carousel : UIView <UIScrollViewDelegate>
	{
	 UIPageControl *pageControl;
	 NSArray *images;
	}
	
	@property (nonatomic, retain) UIPageControl *pageControl;
	@property (nonatomic, retain) NSArray *images;
	
	- (void)setup;
	
	@end
	
	//
	// Carousel.m
	//
	
	#import "Carousel.h"
	
	@implementation Carousel
	
	@synthesize pageControl;
	@synthesize images;
	
	#pragma mark - Override images setter
	
	- (void)setImages:(NSArray *)newImages
	{
	 if (newImages != images)
	 {
	 [newImages retain];
	 [images release];
	 images = newImages;
	
	 [self setup];
	 }
	}
	
	#pragma mark - Carousel setup
	
	- (void)setup
	{
	 UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.frame];
	 [scrollView setDelegate:self];
	 [scrollView setShowsHorizontalScrollIndicator:NO];
	 [scrollView setPagingEnabled:YES];
	 [scrollView setBounces:NO];
	
	 CGSize scrollViewSize = scrollView.frame.size;
	
	 for (NSInteger i = 0; i < [self.images count]; i++)
	 {
	 CGRect slideRect = CGRectMake(scrollViewSize.width * i, 0, scrollViewSize.width, scrollViewSize.height);
	
	 UIView *slide = [[UIView alloc] initWithFrame:slideRect];
	 [slide setBackgroundColor:[UIColor colorWithRed:0 green:0 blue:0 alpha:0]];
	
	 UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.frame];
	 [imageView setImage:[UIImage imageNamed:[self.images objectAtIndex:i]]];
	 [slide addSubview:imageView];
	 [imageView release];
	
	 [scrollView addSubview:slide];
	 [slide release];
	 }
	
	 UIPageControl *tempPageControll = [[UIPageControl alloc] initWithFrame:CGRectMake(0, scrollViewSize.height - 20, scrollViewSize.width, 20)];
	 [self setPageControl:tempPageControll];
	 [tempPageControll release];
	 [self.pageControl setNumberOfPages:[self.images count]];
	 [scrollView setContentSize:CGSizeMake(scrollViewSize.width * [self.images count], scrollViewSize.height)];
	
	 [self addSubview:scrollView];
	 [scrollView release];
	 [self addSubview:self.pageControl];
	}
	
	#pragma mark - UIScrollViewDelegate
	
	- (void)scrollViewDidScroll:(UIScrollView *)scrollView
	{
	CGFloat pageWidth = scrollView.frame.size.width;
	 int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
	[self.pageControl setCurrentPage:page];
	}
	
	#pragma mark - Cleanup
	
	- (void)dealloc
	{
	 [pageControl release];
	 [images release];
	 [super dealloc];
	}
	
	@end
	
	//
	// ViewController.m
	// SimpleCarousel
	//
	
	#import "ViewController.h"
	#import "Carousel.h"
	
	@implementation ViewController
	
	- (void)viewDidLoad
	{
	 [super viewDidLoad];
	
	 // Initialize carousel object with frame size of images
	 Carousel *carousel = [[Carousel alloc] initWithFrame:CGRectMake(0, 0, 320, 205)];
	
	 // Add some images to carousel, we are passing autoreleased NSArray
	 [carousel setImages:[NSArray arrayWithObjects:@"image1.jpg", @"image2.jpg", @"image3.jpg", nil]];
	
	 // Add carousel to view
	 [self.view addSubview:carousel];
	
	 // Cleanup
	 [carousel release];
	}
	
	@end

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　Carousel　　Carousel效果　

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