自己写的一个图片轮播器 

  1 #import "ViewController.h"
  2 
  3 @interface ViewController () <UIScrollViewDelegate>
  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)decelerate
104 {
105     [self setUpTimer];
106 }
107 
108 @end

 

posted @ 2016-03-10 17:45  xiayao.zeng  阅读(185)  评论(0)    收藏  举报