自動廣告圖

#import <UIKit/UIKit.h>

@interface DIEPageView : UIView<UIScrollViewDelegate>{

}

@property (nonatomic, assign) id  delegate;

@property (nonatomic, assign) NSInteger currentPage;

@property (nonatomic, strong) NSMutableArray *imageViewAry;

@property (nonatomic, readonly) UIScrollView *scrollView;

@property (nonatomic, readonly) UIPageControl *pageControl;

-(void)shouldAutoShow:(BOOL)shouldStart;

@end

@protocol WHcrollViewViewDelegate <NSObject>

@optional

- (void)didClickPage:(DIEPageView *)view atIndex:(NSInteger)index;

@end

#import "DIEPageView.h"

@interface DIEPageView(){

    UIView *_firstView;

    UIView *_middleView;

    UIView *_lastView;

    

    float _viewWidth;

    float _viewHeight;

    

    NSTimer *_autoScrollTimer;

    

    UITapGestureRecognizer *_tap;

}

@end

@implementation DIEPageView

/*

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect {

    // Drawing code

}

*/

- (id)initWithFrame:(CGRect)frame

{  

    self = [super initWithFrame:frame];

    if (self) {

        

        _viewWidth = self.bounds.size.width;

        _viewHeight = self.bounds.size.height;

        

        //設置scrollview

        _scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, _viewWidth, _viewHeight)];

        _scrollView.delegate = self;

        _scrollView.contentSize = CGSizeMake(_viewWidth * 3, _viewHeight);

        _scrollView.showsHorizontalScrollIndicator = NO;

        _scrollView.pagingEnabled = YES;

        _scrollView.backgroundColor = [UIColor blackColor];

        _scrollView.delegate = self;

        [self addSubview:_scrollView];

        

        //設置分頁

        _pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, _viewHeight-30, _viewWidth, 30)];

        _pageControl.userInteractionEnabled = NO;

        _pageControl.currentPageIndicatorTintColor = [UIColor redColor];

        _pageControl.pageIndicatorTintColor = [UIColor whiteColor];

        [self addSubview:_pageControl];

        

        //設置單擊手勢

        _tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTap:)];

        _tap.numberOfTapsRequired = 1;

        _tap.numberOfTouchesRequired = 1;

        [_scrollView addGestureRecognizer:_tap];

    }

    return self;

}

#pragma mark 單擊手勢

-(void)handleTap:(UITapGestureRecognizer*)sender

{

    if ([_delegate respondsToSelector:@selector(didClickPage:atIndex:)]) {

        [_delegate didClickPage:self atIndex:_currentPage+1];

    }

}

#pragma mark 設置imageViewAry

-(void)setImageViewAry:(NSMutableArray *)imageViewAry

{

    if (imageViewAry) {

        _imageViewAry = imageViewAry;

        _currentPage = 0; //默認爲第0頁

        

        _pageControl.numberOfPages = _imageViewAry.count;

    }

    

    [self reloadData];

}

#pragma mark 刷新view頁面

-(void)reloadData

{

    [_firstView removeFromSuperview];

    [_middleView removeFromSuperview];

    [_lastView removeFromSuperview];

    

    //從數組中取到對應的圖片view加到已定義的三個view中

    if (_currentPage==0) {

        _firstView = [_imageViewAry lastObject];

        _middleView = [_imageViewAry objectAtIndex:_currentPage];

        _lastView = [_imageViewAry objectAtIndex:_currentPage+1];

    }

    else if (_currentPage == _imageViewAry.count-1)

    {

        _firstView = [_imageViewAry objectAtIndex:_currentPage-1];

        _middleView = [_imageViewAry objectAtIndex:_currentPage];

        _lastView = [_imageViewAry firstObject];

    }

    else

    {

        _firstView = [_imageViewAry objectAtIndex:_currentPage-1];

        _middleView = [_imageViewAry objectAtIndex:_currentPage];

        _lastView = [_imageViewAry objectAtIndex:_currentPage+1];

    }

    

    //設置三個view的frame，加到scrollview上

    _firstView.frame = CGRectMake(0, 0, _viewWidth, _viewHeight);

    _middleView.frame = CGRectMake(_viewWidth, 0, _viewWidth, _viewHeight);

    _lastView.frame = CGRectMake(_viewWidth*2, 0, _viewWidth, _viewHeight);

    [_scrollView addSubview:_firstView];

    [_scrollView addSubview:_middleView];

    [_scrollView addSubview:_lastView];

    

    //設置當前的分頁

    _pageControl.currentPage = _currentPage;

    

    //顯示中間頁

    _scrollView.contentOffset = CGPointMake(_viewWidth, 0);

}

#pragma mark scrollvie中止滑動

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

{

    //手動滑動時候暫停自動替換

    [_autoScrollTimer invalidate];

    _autoScrollTimer = nil;

    _autoScrollTimer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(autoShowNextImage) userInfo:nil repeats:YES];

    

    //獲得當前頁數

    float x = _scrollView.contentOffset.x;

    

    //往前翻

    if (x<=0) {

        if (_currentPage-1<0) {

            _currentPage = _imageViewAry.count-1;

        }else{

            _currentPage --;

        }

    }

    

    //日後翻

    if (x>=_viewWidth*2) {

        if (_currentPage==_imageViewAry.count-1) {

            _currentPage = 0;

        }else{

            _currentPage ++;

        }

    }

    

    [self reloadData];

}

#pragma mark 自動滾動

-(void)shouldAutoShow:(BOOL)shouldStart

{

    if (shouldStart)  //開啓自動翻頁

    {

        if (!_autoScrollTimer) {

            _autoScrollTimer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(autoShowNextImage) userInfo:nil repeats:YES];

        }

    }

    else   //關閉自動翻頁

    {

        if (_autoScrollTimer.isValid) {

            [_autoScrollTimer invalidate];

            _autoScrollTimer = nil;

        }

    }

}

#pragma mark 展現下一頁

-(void)autoShowNextImage

{

    if (_currentPage == _imageViewAry.count-1) {

        _currentPage = 0;

    }else{

        _currentPage ++;

    }

    

    [self reloadData];

}

@end

#import "AdvertiseViewController.h"

#import "DIEPageView.h"

@interface AdvertiseViewController (){

    DIEPageView *_whView;

}

@end

@implementation AdvertiseViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    //建立view （view中包含UIScrollView、UIPageControl，設置frame）

    _whView = [[DIEPageView alloc] initWithFrame:CGRectMake(0, 44, 320, 400)];

    

    //把N張圖片放到imageview上

    NSMutableArray *tempAry = [NSMutableArray array];

    for (int i=1; i<6; i++) {

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

        imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg",i]];

        [tempAry addObject:imageView];

    }

    

    //把imageView數組存到whView裏

    [_whView setImageViewAry:tempAry];

    

    //把圖片展現的view加到當前頁面

    [self.view addSubview:_whView];

    

    //開啓自動翻頁

    [_whView shouldAutoShow:YES];

    

    //遵照協議

    _whView.delegate = self;

}

#pragma mark 協議裏面方法，點擊某一頁

-(void)didClickPage:(DIEPageView *)view atIndex:(NSInteger)index

{

    NSLog(@"點擊了第%li頁",index);

}

#pragma mark 界面消失的時候，中止自動滾動

-(void)viewDidDisappear:(BOOL)animated

{

    [_whView shouldAutoShow:NO];

}

@end