iOS自动轮播器代码

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UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 150)];

scrollView.delegate = self;

scrollView.showsHorizontalScrollIndicator = NO;

scrollView.shouldGroupAccessibilityChildren = NO;

scrollView.pagingEnabled = YES;

self.scrollview = scrollView;

[headerView addSubview:scrollView];

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

pagecontrol.numberOfPages = 3;

pagecontrol.currentPageIndicatorTintColor = [UIColor blueColor];

pagecontrol.pageIndicatorTintColor = [UIColor yellowColor];

self.pageControl = pagecontrol;

[headerView addSubview:pagecontrol];

[pagecontrol mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerX.equalTo(scrollView.mas_centerX);

make.centerY.equalTo(scrollView.mas_centerY).with.offset(50);

make.height.mas_equalTo(15);

make.width.mas_equalTo(30);

}];

//    图片的宽

CGFloat imageW = scrollView.frame.size.width;

//    图片高

CGFloat imageH = scrollView.frame.size.height;

//    图片的Y

CGFloat imageY = 0;

//    图片中数

NSInteger totalCount = 3;

for (int i = 0; i < totalCount; i++) {

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

//        图片X

CGFloat imageX = i * imageW;

//        设置frame

imageView.frame = CGRectMake(imageX, imageY, imageW, imageH);

//        设置图片

imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"image%d", i + 1]];

//      隐藏指示条

scrollView.showsHorizontalScrollIndicator = NO;

[self.scrollview addSubview:imageView];

}

// 设置scrollview的滚动范围

CGFloat contentW = totalCount *imageW;

//不允许在垂直方向上进行滚动

scrollView.contentSize = CGSizeMake(contentW, 0);

//    3.设置分页

scrollView.pagingEnabled = YES;

//    4.监听scrollview的滚动

scrollView.delegate = self;

[self addTimer];

// scrollview滚动的时候调用

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

//    计算页码

CGFloat scrollviewW =  scrollView.frame.size.width;

CGFloat x = scrollView.contentOffset.x;

int page = (x + scrollviewW / 2) /  scrollviewW;

self.pageControl.currentPage = page;

}

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

//    关闭定时器(注意点; 定时器一旦被关闭,无法再开启)

[self removeTimer];

}

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

{

//    开启定时器

[self addTimer];

}

-(void)addTimer{

self.timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(nextImage) userInfo:nil repeats:YES];

}

- (void)nextImage{

int page = (int)self.pageControl.currentPage;

if (page == 2) {

page = 0;

}else

{

page++;

}

//  滚动scrollview

CGFloat x = page * self.scrollview.frame.size.width;

self.scrollview.contentOffset = CGPointMake(x, 0);

}

- (void)removeTimer{

[self.timer invalidate];

}