iOS 轮播图实现

标签：ios   轮播图   

#define SCREEN_SIZE [UIScreen mainScreen].bounds.size
#define KImageCount 3
#define KImage_Height  250

@interface ViewController ()<UIScrollViewDelegate>
@property (nonatomic, strong) UIScrollView * scrollView;
@property (nonatomic, strong) UIPageControl * pageControl;
@property (nonatomic, strong) NSTimer * timer;
@end

@implementation ViewController
- (UIScrollView *)scrollView{
    if (_scrollView == nil) {
        _scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_SIZE.width, KImage_Height)];
        _scrollView.pagingEnabled = YES;
        _scrollView.showsHorizontalScrollIndicator = NO;
    }
    return _scrollView;
}
- (UIPageControl *)pageControl{
    if (_pageControl == nil) {
        _pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, self.scrollView.frame.size.height - 30, SCREEN_SIZE.width, 20)];
        _pageControl.currentPageIndicatorTintColor = [UIColor colorWithRed:65 / 255.0 green:168 / 255.0 blue:100/255.0 alpha:1.0];
        _pageControl.pageIndicatorTintColor = [UIColor grayColor];
        
    }
    return _pageControl;
}
- (void)setView{
    [self.view addSubview:self.scrollView];
    [self.view addSubview:self.pageControl];
    CGFloat imageY = 0;
    CGFloat imageW = SCREEN_SIZE.width;
    CGFloat imageH = KImage_Height;
    for (int i = 0; i < KImageCount; i++) {
        UIImageView * imageView = [[UIImageView alloc] initWithFrame:CGRectMake(i * imageW, imageY, imageW, imageH)];
        imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg", i+1]];
        [self.scrollView addSubview:imageView];
    }
    self.scrollView.contentSize = CGSizeMake(KImageCount * imageW, 0);
    self.scrollView.delegate = self;
    self.pageControl.numberOfPages = KImageCount;
    [self addTimer];
}
- (void)addTimer {
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(nextImage) userInfo:nil repeats:YES];
    [[NSRunLoop mainRunLoop]addTimer:self.timer forMode:NSDefaultRunLoopMode];
}
- (void)nextImage{
    int i = (int)self.pageControl.currentPage;
    if (i == KImageCount - 1) {
        i = -1;
    }
    i++;
    [self.scrollView setContentOffset:CGPointMake(i * self.scrollView.frame.size.width, 0) animated:YES];
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
    [self turnOffTimer];
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
    [self addTimer];
}
- (void)turnOffTimer{
    [self.timer invalidate];
    self.timer = nil;
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    self.pageControl.currentPage = (self.scrollView.frame.size.width * 0.5 + self.scrollView.contentOffset.x) / self.scrollView.frame.size.width;
}
- (void)viewDidLoad {
    [super viewDidLoad];
    self.title = @"轮播图";
    [self setView];
}

iOS 轮播图实现

标签：ios   轮播图   

原文地址：http://blog.csdn.net/darongzi1314/article/details/46728411