轮播器无限循环播放

#define kmainScreenW [UIScreen mainScreen].bounds.size.width#define kmainScreenH [UIScreen mainScreen].bounds.size.height#import "ViewController.h"@interface ViewController ()@property (nonatomic ,weak) UIScrollView *scrollView;

@property (nonatomic ,weak) UIImageView *imageViewLeft;

@property (nonatomic ,weak) UIImageView *imageViewCenter;

@property (nonatomic ,weak) UIImageView *imageViewRight;

@property (nonatomic ,strong) NSArray *dataArray;

@property (nonatomic ,weak) UIPageControl *pageControl;

@property (nonatomic ,assign) NSInteger currentImageIndex;

@property (nonatomic ,weak) NSTimer *timer;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

NSArray *dataArray = @[@"image1",@"image2",@"image3",@"image4"];

_dataArray = dataArray;

_currentImageIndex = 0;

[self setUpScrollView];

[self setUpImageView];

if (dataArray.count >= 2) {

[self setUpPageConrol];

[self setUpTimer];

}

}

//添加ScrollView

- (void)setUpScrollView{

UIScrollView *scrollView = [[UIScrollView alloc] init];

scrollView.frame = CGRectMake(0, 0, kmainScreenW, kmainScreenW *0.6);

//    scrollView.backgroundColor = [UIColor blueColor];

[self.view addSubview:scrollView];

scrollView.contentSize = CGSizeMake(_dataArray.count *kmainScreenW, kmainScreenW * 0.6);

scrollView.delegate = self;

[scrollView setContentOffset:CGPointMake(kmainScreenW, 0) animated:NO];

scrollView.pagingEnabled = YES;

scrollView.showsHorizontalScrollIndicator = NO;

_scrollView = scrollView;

}

//添加ImageView

- (void)setUpImageView{

if (_dataArray.count >= 2) {

UIImageView *imageViewLeft = [[UIImageView alloc] init];

imageViewLeft.frame = CGRectMake(0, 0, kmainScreenW, kmainScreenW *0.6);

[_scrollView addSubview:imageViewLeft];

imageViewLeft.image = [UIImage imageNamed:_dataArray[_dataArray.count-1]];

_imageViewLeft = imageViewLeft;

}

UIImageView *imageViewCenter = [[UIImageView alloc] init];

imageViewCenter.frame = CGRectMake(kmainScreenW, 0, kmainScreenW, kmainScreenW *0.6);

[_scrollView addSubview:imageViewCenter];

if (_dataArray.count >= 1) {

imageViewCenter.image = [UIImage imageNamed:_dataArray[0]];

}

//    imageViewCenter.backgroundColor = [UIColor redColor];

_imageViewCenter = imageViewCenter;

if (_dataArray.count >= 2) {

UIImageView *imageViewRight = [[UIImageView alloc] init];

imageViewRight.frame = CGRectMake(kmainScreenW *2.0, 0, kmainScreenW, kmainScreenW *0.6);

[_scrollView addSubview:imageViewRight];

imageViewRight.image = [UIImage imageNamed:_dataArray[1]];

_imageViewRight = imageViewRight;

}

}

//添加PageConrol

- (void)setUpPageConrol{

UIPageControl *pageControl = [[UIPageControl alloc] init];

CGSize size = [pageControl sizeForNumberOfPages:_dataArray.count];

pageControl.bounds = CGRectMake(0, 0, size.width, size.height);

pageControl.center = CGPointMake(kmainScreenW *0.5, size.height);

pageControl.pageIndicatorTintColor = [UIColor whiteColor];

pageControl.currentPageIndicatorTintColor = [UIColor redColor];

pageControl.numberOfPages = _dataArray.count;

_pageControl = pageControl;

[self.view addSubview:pageControl];

}

// 添加定时器

- (void)setUpTimer{

NSTimer *timer = [NSTimer timerWithTimeInterval:2.0 target:self selector:@selector(timerChanged) userInfo:nil repeats:YES];

self.timer = timer;

[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];

}

//定时器生效,图片自动轮播

- (void)timerChanged{

NSInteger page = (_pageControl.currentPage + 1)%_dataArray.count;

_pageControl.currentPage = page;

[self pageChanged:_pageControl];

}

//页面变动

- (void)pageChanged: (UIPageControl *)pageControl{

CGFloat x = 2 * kmainScreenW;

//    [_scrollView setContentOffset:CGPointMake(x, 0) animated:YES];

//    _currentImageIndex = pageControl.currentPage;

//    [self scrollViewDidEndDecelerating:_scrollView];

NSInteger leftImageIndex,rightImageIndex;

CGPoint offset = [_scrollView contentOffset];

_currentImageIndex = (_currentImageIndex + 1) %_dataArray.count;

leftImageIndex = (_currentImageIndex  - 1 + _dataArray.count)%_dataArray.count;

rightImageIndex = (_currentImageIndex + 1)%_dataArray.count;

_imageViewCenter.image = [UIImage imageNamed:_dataArray[_currentImageIndex]];

_imageViewLeft.image = [UIImage imageNamed:_dataArray[leftImageIndex]];

_imageViewRight.image = [UIImage imageNamed:_dataArray[rightImageIndex]];

_pageControl.currentPage = _currentImageIndex;

[UIView animateWithDuration:1.0 animations:^{

_scrollView.contentOffset = CGPointMake(2 * kmainScreenW,0);

}];

_scrollView.contentOffset = CGPointMake(kmainScreenW,0);

}

//滑动开始的时候停止定时器

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{

[_timer invalidate];

}

//滑动完毕的时候启动定时器

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{

[self setUpTimer];

}

//设置无限循环播放

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

[self reloadImage];

[_scrollView setContentOffset:CGPointMake(kmainScreenW, 0) animated:NO];

//    _scrollView.contentOffset = CGPointMake(kmainScreenW,0);//两个方法都可以

_pageControl.currentPage = _currentImageIndex;

}

//重新加载图片

- (void)reloadImage{

NSInteger leftImageIndex,rightImageIndex;

CGPoint offset = [_scrollView contentOffset];

if (offset.x >kmainScreenW) {//向右滑动

_currentImageIndex = (_currentImageIndex + 1) %_dataArray.count;

}else if(offset.x < kmainScreenW){//向左滑动

_currentImageIndex = (_currentImageIndex - 1 + _dataArray.count) %_dataArray.count;

}

leftImageIndex = (_currentImageIndex  - 1 + _dataArray.count)%_dataArray.count;

rightImageIndex = (_currentImageIndex + 1)%_dataArray.count;

_imageViewCenter.image = [UIImage imageNamed:_dataArray[_currentImageIndex]];

_imageViewLeft.image = [UIImage imageNamed:_dataArray[leftImageIndex]];

_imageViewRight.image = [UIImage imageNamed:_dataArray[rightImageIndex]];

}

@end

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