1 #import "ViewController.h"  2   3 @interface ViewController () 
     
        4 /**  5  *  图片轮播器  6  */  7 @property (nonatomic ,weak  ) UIScrollView    *scrView;  8 /**  9  *  页面指示器 10  */ 11 @property (nonatomic, weak  ) UIPageControl   *pgControl; 12 /** 13  *  计时器 14  */ 15 @property (nonatomic, strong) NSTimer         *timer; 16 @end 17  18 @implementation ViewController 19 - (void)viewDidLoad 20 { 21     [super viewDidLoad]; 22     //加载图片轮播器 23     [self setUpScrView]; 24     //加载页面指示器 25     [self setUpPageControl]; 26     //加载定时器 27     [self setUpTimer]; 28 } 29 - (void)setUpScrView 30 { 31     UIScrollView *scrView                  = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, 250)]; 32     scrView.alwaysBounceHorizontal         = YES; 33     scrView.showsHorizontalScrollIndicator = NO; 34     scrView.pagingEnabled                  = YES; 35     scrView.contentSize                    = CGSizeMake(self.view.frame.size.width * 5, 250); 36     _scrView                               = scrView; 37     [self setUpImg]; 38     [self.view addSubview:_scrView]; 39 } 40  41 - (void)setUpPageControl 42 { 43     UIPageControl *pgControl                = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 32)]; 44     pgControl.center                        = CGPointMake(CGRectGetMidX(self.view.bounds), 300); 45     pgControl.currentPage                   = 0; 46     pgControl.numberOfPages                 = 5; 47     pgControl.currentPageIndicatorTintColor = [UIColor redColor]; 48     pgControl.pageIndicatorTintColor        = [UIColor greenColor]; 49     _pgControl                              = pgControl; 50     [self.view addSubview:_pgControl]; 51 } 52  53 - (void)scrollImage 54 { 55     NSInteger page = _pgControl.currentPage; 56     if (page == _pgControl.numberOfPages - 1) { 57         page = 0; 58     } else { 59         page ++; 60     } 61     CGFloat offsetX = page * _scrView.frame.size.width; 62     [_scrView setContentOffset:CGPointMake(offsetX, 0) animated:YES]; 63  64     _pgControl.currentPage = page; 65 } 66  67 - (void)setUpTimer 68 { 69     _timer             = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(scrollImage) userInfo:nil repeats:YES]; 70     NSRunLoop *runloop = [NSRunLoop currentRunLoop]; 71     [runloop addTimer:_timer forMode:NSRunLoopCommonModes]; 72 } 73  74 - (void)setUpImg 75 { 76     CGFloat imgW = self.view.bounds.size.width; 77     CGFloat imgH = 250; 78     CGFloat imgY = 0; 79     for (int i = 0; i < 5; i ++) { 80         CGFloat imgX = imgW * i; 81         UIImageView *imgView = [[UIImageView alloc] init]; 82         imgView.image        = [UIImage imageNamed:[NSString stringWithFormat:@"img_%02d", i + 1]]; 83         imgView.frame        = CGRectMake(imgX, imgY, imgW, imgH); 84         [_scrView addSubview:imgView]; 85     } 86 } 87  88 #pragma mark UIScrollView代理方法 89 - (void)scrollViewDidScroll:(UIScrollView *)scrollView 90 { 91     CGFloat offsetX        = _scrView.contentOffset.x; 92     offsetX                += _scrView.frame.size.width / 2; 93     NSInteger page         = offsetX / _scrView.frame.size.width; 94     _pgControl.currentPage = page; 95 } 96  97 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView 98 { 99     [_timer invalidate];100     _timer = nil;101 }102 103 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate104 {105     [self setUpTimer];106 }107 108 @end