滚动视图(UIScrollView)无限无缝左右切换图片,自动顺序加逆序循环播放图片

//
//  LoopView.h
//  Test_LoopScrollView
//
//  Created by lanouhn on 14-8-30.
//  Copyright (c) 2014年 vaercly@163.com 陈聪雷. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface LoopView : UIView
@property (nonatomic, retain) UIScrollView *scrollView;
@property (nonatomic, retain) UIPageControl *pageControl;
@end
//
//  LoopView.m
//  Test_LoopScrollView
//
//  Created by lanouhn on 14-8-30.
//  Copyright (c) 2014年 vaercly@163.com 陈聪雷. All rights reserved.
//

#import "LoopView.h"

@implementation LoopView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        [self setupScrollView];
        [self setupPageControl];
    }
    return self;
}

- (void)setupScrollView
{
    self.scrollView = [[UIScrollView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    _scrollView.tag = 200;
    _scrollView.contentSize = CGSizeMake(320 * 7, [UIScreen mainScreen].bounds.size.height);
//    [_scrollView scrollRectToVisible:CGRectMake(320,0,320,[UIScreen mainScreen].bounds.size.height) animated:NO];
    [_scrollView setContentOffset:CGPointMake(320, 0) animated:NO];
    _scrollView.showsHorizontalScrollIndicator = NO;
    _scrollView.pagingEnabled = YES;
    [self addSubview:_scrollView];
    [_scrollView release];
    
    for (int i = 0; i < 7; i++) {
        UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(320 * i, 0, 320, [UIScreen mainScreen].bounds.size.height)];
        if (i == 0) {
            imageView.image = [UIImage imageNamed:@"girl_5.jpg"];
        } else if (i == 6) {
            imageView.image = [UIImage imageNamed:@"girl_1.jpg"];
        } else {
            imageView.image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"girl_%d", i]ofType:@"jpg"]];
        }
        [_scrollView addSubview:imageView];
        [imageView release];
    }
}

- (void)setupPageControl
{
    self.pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(10, [UIScreen mainScreen].bounds.size.height - 40, 300, 20)];
    _pageControl.tag = 100;
    _pageControl.numberOfPages = 5;
    _pageControl.currentPage = 0;
    _pageControl.pageIndicatorTintColor = [UIColor grayColor];
    _pageControl.currentPageIndicatorTintColor = [UIColor orangeColor];
    [self addSubview:_pageControl];
    [_pageControl release];
    
}

- (void)dealloc
{
    self.scrollView = nil;
    self.pageControl = nil;
    [super dealloc];
}


/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
}
*/

@end
//
//  RootViewController.m
//  Test_LoopScrollView
//
//  Created by lanouhn on 14-8-30.
//  Copyright (c) 2014年 vaercly@163.com 陈聪雷. All rights reserved.
//

#import "RootViewController.h"
#import "LoopView.h"
@interface RootViewController ()<UIScrollViewDelegate>
{
    BOOL _isOrder;
}
@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
        _isOrder = YES;
        [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(changePage) userInfo:nil repeats:YES];
    }
    return self;
}

- (void)loadView
{
    LoopView *loopView = [[LoopView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    loopView.backgroundColor = [UIColor grayColor];
    self.view = loopView;
    [loopView release];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    LoopView *loopView = ( LoopView *)self.view;
    loopView.scrollView.delegate = self;
    [loopView.pageControl addTarget:self action:@selector(handlePageControl:) forControlEvents:UIControlEventValueChanged];
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    UIPageControl *pageControl = (UIPageControl *)[self.view viewWithTag:100];
    int currentPage = scrollView.contentOffset.x / 320;
    
    if (currentPage == 0) {
//        [scrollView scrollRectToVisible:CGRectMake(320 * 5, 0, 320, [UIScreen mainScreen].bounds.size.height) animated:NO];
        [scrollView setContentOffset:CGPointMake(320 * 5, 0) animated:NO];
        pageControl.currentPage = 4;
    } else if (currentPage == 6) {
//        [scrollView scrollRectToVisible:CGRectMake(320, 0, 320, [UIScreen mainScreen].bounds.size.height) animated:NO];
        [scrollView setContentOffset:CGPointMake(320, 0) animated:NO];
        pageControl.currentPage = 0;
    } else {
        pageControl.currentPage = currentPage - 1;
    }
}

- (void)handlePageControl:(UIPageControl *)pageControl
{
    NSLog(@"%d", pageControl.currentPage);
    UIScrollView *scrollView = (UIScrollView *)[self.view viewWithTag:200];
//    [scrollView scrollRectToVisible:CGRectMake(320 * (pageControl.currentPage + 1),0,320,[UIScreen mainScreen].bounds.size.height) animated:NO];
    [scrollView setContentOffset:CGPointMake(320 * (pageControl.currentPage + 1), 0) animated:YES];
}

- (void)changePage
{
    //单序版
    /*
    LoopView *loopView = ( LoopView *)self.view;
    int page = loopView.pageControl.currentPage;
    page++;
    page = page > 4 ? 0 : page;
    loopView.pageControl.currentPage = page;
//    [loopView.scrollView scrollRectToVisible:CGRectMake(320 * (page + 1), 0, 320, [UIScreen mainScreen].bounds.size.height) animated:NO];
    if (page) {
        [loopView.scrollView setContentOffset:CGPointMake(320 * (page + 1), 0) animated:YES];
    } else {
        [loopView.scrollView setContentOffset:CGPointMake(320 * (page + 1), 0) animated:NO];
    }
     */
    
    //双序版
    LoopView *loopView = ( LoopView *)self.view;
    int page = loopView.pageControl.currentPage;
    if (_isOrder) {
        page++;
        page = page > 4 ? 0 : page;
        if (!page) {
            _isOrder = NO;
            page = 3;
        }
    } else {
        page--;
        page = page < 0 ? 0 : page;
        if (!page) {
            _isOrder = YES;
            page = 0;
        }
    }
    loopView.pageControl.currentPage = page;
    [loopView.scrollView setContentOffset:CGPointMake(320 * (page + 1), 0) animated:YES];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end