创建UIScrollView及添加tableView
//UIScrollView能滚动就是改变了自身的bounds
//UIScrollView代理协议UIScrollViewDelegate
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];
scrollView.backgroundColor = [UIColor yellowColor];
scrollView.tag = scrollViewTag;
[self.view addSubview:scrollView];
//设置滚动范围,滚动的前提：滚动范围要比scrollView本身的宽高要大
scrollView.contentSize = CGSizeMake(kScreenWidth * 4, 0);
for (int i = 1; i < 5; i++) {
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake((i - 1) * kScreenWidth, 0, kScreenWidth, SCREEN_HEIGHT)];
UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"%d", i]];
imageView.image = image;
imageView.tag = 1110 + i;
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 700, kScreenWidth, 20)];
label.text = [NSString stringWithFormat:@"第%d页", i];
[imageView addSubview:label];
[scrollView addSubview:imageView];
}
//最重要的属性：设置偏移量，显示第几张照片
//偏移量 scrollView滚动的时候，scrollVIew自身是固定不动的，动的是子视图。偏移量指的是子视图相对于scrollView发生的偏移量
// scrollView.contentOffset = CGPointMake(kScreenWidth * 1, 0);
//代理
scrollView.delegate = self;
//整页滚动
scrollView.pagingEnabled = YES;
//滚动条的显示与否
//横向
scrollView.showsHorizontalScrollIndicator = NO;
//竖向
scrollView.showsVerticalScrollIndicator = NO;
//点击状态栏返回顶部
scrollView.scrollsToTop = YES;
//scrollView发的回弹效果
// scrollView.bounces = NO;
//能否滚动， 默认是YES
scrollView.scrollEnabled = YES;
创建UIPageControl
UIPageControl *pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 650, kScreenWidth, 50)];
pageControl.numberOfPages = 4;
pageControl.tag = pageControlTag;
// pageControl.backgroundColor = [UIColor redColor];
[pageControl addTarget:self action:@selector(pageControlAction:) forControlEvents:UIControlEventValueChanged];
pageControl.pageIndicatorTintColor = [UIColor purpleColor];
pageControl.currentPageIndicatorTintColor = [UIColor greenColor];
[self.view addSubview:pageControl];
创建UISlider
UISlider *slider = [[UISlider alloc] initWithFrame:CGRectMake(0, 580, kScreenWidth, 20)];
[self.view addSubview:slider];
slider.minimumTrackTintColor = [UIColor greenColor];
slider.maximumTrackTintColor = [UIColor redColor];
slider.tag = sliderTag;
slider.maximumValue = kScreenWidth * 3;
[slider addTarget:self action:@selector(sliderAction:) forControlEvents:UIControlEventValueChanged];
UISlider回调方法
- (void)sliderAction:(UISlider *)slider{
UIScrollView *scrollView = (UIScrollView *)[self.view viewWithTag:scrollViewTag];
[scrollView setContentOffset:CGPointMake(slider.value, 0) animated:YES];
}
UIPageControl回调方法
- (void)pageControlAction:(UIPageControl *)pageControl{
UIScrollView *scrollView = (UIScrollView *)[self.view viewWithTag:scrollViewTag];
[scrollView setContentOffset:CGPointMake(pageControl.currentPage * kScreenWidth, 0) animated:YES];
}
UIScrollView代理方法
滚动方法
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
NSLog(@"将要开始拖拽");
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
NSLog(@"已经滚动");
NSLog(@"%@", NSStringFromCGPoint(scrollView.contentOffset));
UIPageControl *pageControl = (UIPageControl *)[self.view viewWithTag:pageControlTag];
pageControl.currentPage = (scrollView.contentOffset.x + kScreenWidth / 2 ) / kScreenWidth;
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
NSLog(@"停止拖拽");
}
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
NSLog(@"将要开始减速");
// UIPageControl *pageControl = (UIPageControl *)[self.view viewWithTag:pageControlTag];
// UISlider *slider = (UISlider *)[self.view viewWithTag:sliderTag];
// slider.value = scrollView.contentOffset.x / kScreenWidth;
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
NSLog(@"减速停止，停止滚动");
UIPageControl *pageControl = (UIPageControl *)[self.view viewWithTag:pageControlTag];
pageControl.currentPage = scrollView.contentOffset.x / kScreenWidth;
UISlider *slider = (UISlider *)[self.view viewWithTag:sliderTag];
slider.value = scrollView.contentOffset.x;
}
方法缩小方法
//指定scrollView上的哪一个子视图进行缩放
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
return [scrollView.subviews firstObject];
}
- (void)scrollViewDidZoom:(UIScrollView *)scrollView{
// UIImageView *imageView = (UIImageView *)[scrollView.subviews firstObject];
// imageView.center = self.view.center;
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
//只有缩小时才执行固定中心点的代码
if (scrollView.zoomScale < 1) {
NSLog(@"niaho");
scrollView.contentOffset = CGPointMake((scrollView.contentSize.width - scrollView.frame.size.width) / 2, (scrollView.contentSize.height - scrollView.frame.size.height) / 2);
}
}
//恢复原状
// self.scrolView.zoomScale = 1;
