#import "MJViewController.h"
#define kCount 8 //定义宏，程序中经常使用，方便扩展
@interface MJViewController () <UIScrollViewDelegate>
{
UIPageControl *_pageControl;
}
@end
@implementation MJViewController
- (void)viewDidLoad
{
[super viewDidLoad];
CGFloat w = self.view.frame.size.width;
CGFloat h = self.view.frame.size.height;
for (int i = 0; i< kCount; i++) {
UIImageView *imageView = [[UIImageView alloc] init];
// 1.设置frame
imageView.frame = CGRectMake(i * w, 0, w, h);
// 2.设置图片
NSString *imgName = [NSString stringWithFormat:@"0%d.jpg", i + 1];
imageView.image = [UIImage imageNamed:imgName];
[_scrollView addSubview:imageView];
}
// height == 0 代表 禁止垂直方向滚动
_scrollView.contentSize = CGSizeMake(kCount * w, 0);
_scrollView.showsHorizontalScrollIndicator = NO;
_scrollView.pagingEnabled = YES;
_scrollView.delegate = self;
// 添加PageControl
UIPageControl *pageControl = [[UIPageControl alloc] init];
pageControl.center = CGPointMake(w * 0.5, h - 20);
pageControl.bounds = CGRectMake(0, 0, 150, 50);
pageControl.numberOfPages = kCount; // 一共显示多少个圆点（多少页）
// 设置非选中页的圆点颜色
pageControl.pageIndicatorTintColor = [UIColor redColor];
// 设置选中页的圆点颜色
pageControl.currentPageIndicatorTintColor = [UIColor blueColor];
// 禁止默认的点击功能
pageControl.enabled = NO;
[self.view addSubview:pageControl];
_pageControl = pageControl;
}
#pragma mark - UIScrollView的代理方法
#pragma mark 当scrollView正在滚动的时候调用
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
int page = scrollView.contentOffset.x / scrollView.frame.size.width;
// NSLog(@"%d", page);
// 设置页码
_pageControl.currentPage = page;
}
@end