iOS开发中使用UIScrollView实现图片轮播和点击加载

//    图片的Y
    CGFloat imageY = 0;
//    图片中数
    NSInteger totalCount = 5;
//   1.添加5张图片
    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
        NSString *name = [NSString stringWithFormat:@"img_0%d", i + 1];
        imageView.image = [UIImage imageNamed:name];
//        隐藏指示条
        self.scrollview.showsHorizontalScrollIndicator = NO;
        
        [self.scrollview addSubview:imageView];
    }
    
//    2.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
    self.scrollview.contentSize = CGSizeMake(contentW, 0);
    
//    3.设置分页
    self.scrollview.pagingEnabled = YES;
    
//    4.监听scrollview的滚动
    self.scrollview.delegate = self;
    
    [self addTimer];
}

- (void)nextImage
{
    int page = (int)self.pageControl.currentPage;
    if (page == 4) {
        page = 0;
    }else
    {
        page++;
    }
    
//  滚动scrollview
    CGFloat x = page * self.scrollview.frame.size.width;
    self.scrollview.contentOffset = CGPointMake(x, 0);
}

// scrollview滚动的时候调用
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    NSLog(@"滚动中");
//    计算页码
//    页码 = (contentoffset.x + scrollView一半宽度)/scrollView宽度