UIPageView和UIScrollView的结合使用

最新推荐文章于 2021-08-20 16:33:48 发布

原创最新推荐文章于 2021-08-20 16:33:48 发布 · 496 阅读

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#OC #uiscrollview #uiimageview

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本文介绍了一个简单的iOS应用启动时的引导页面实现方法。通过使用UIScrollView和UIPageControl组件，可以轻松创建带有翻页效果的启动引导视图，并介绍了如何加载资源图片以及设置页面指示器。

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- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor whiteColor];
//    用户偏好设置 存储在本地 比如程序是否第一次加载
//    NSUserDefaults *user = [NSUserDefaults standardUserDefaults];
//    if (![user boolForKey:@"aa"]) {
        [self setupFirstLanchView];
//        [user setBool:YES forKey:@"aa"];
//        //立即同步
//        [user synchronize];
//    }
    /**
     *  UIPageControl
     表示所有的页数,表示当前正处于第几页,点击切换页数
     *
*/

    
}
//创建程序第一次加载要显示的视图
-(void)setupFirstLanchView{
    [self setupScrollView];
    [self setUpPageControl];
}
-(void)setupScrollView{
    UIScrollView *scrollView = [[UIScrollView alloc]initWithFrame:[UIScreen mainScreen].bounds];
    scrollView.pagingEnabled = YES;
    scrollView.showsVerticalScrollIndicator = NO;
    scrollView.showsHorizontalScrollIndicator = NO;
    scrollView.bounces = NO;
    scrollView.delegate = self;

    scrollView.contentSize = CGSizeMake(320 * 6, [UIScreen mainScreen].bounds.size.height) ;
    scrollView.tag = 100;
    [self.view addSubview:scrollView];
    [scrollView release];
    for (int  i = 0 ; i < 6; i ++) {
        UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(320 * i, 0, 320, [UIScreen mainScreen].bounds.size.height)];
        imageView.image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle]pathForResource:[NSString stringWithFormat:@"v6_guide_%d",i + 1] ofType:@"png"]];
        [scrollView addSubview:imageView];
        [imageView release];
    }
}
-(void)setUpPageControl{
    UIPageControl *pagecontrol = [[UIPageControl alloc]initWithFrame:CGRectMake(10, [UIScreen mainScreen].bounds.size.height - 40, 300, 20)];
    //页数
    pagecontrol.tag = 101;
    pagecontrol.numberOfPages = 6;
//    //未选中圆点颜色
    pagecontrol.pageIndicatorTintColor = [UIColor greenColor];
//    //设置选中点的颜色
    pagecontrol.currentPageIndicatorTintColor = [UIColor redColor];
    //设置当前显示页 从零开始
    pagecontrol.currentPage = 0;
    //    添加响应事件
    [pagecontrol addTarget:self action:@selector(handlePageControl:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:pagecontrol];
    [pagecontrol release];
}
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    //    当结束拖拽时触发
    NSLog(@"%s",__FUNCTION__);
    UIPageControl *page = (UIPageControl *) [self.view viewWithTag:101];
    page.currentPage = scrollView.contentOffset.x/320;
    NSLog(@"%f",scrollView.contentOffset.x);
    NSLog(@"%ld",(long)page.currentPage);
}

-(void)handlePageControl:(UIPageControl *)pageControl{
    NSLog(@"%ld",(long)pageControl.currentPage);
//    切换pageControl对应切换scrollView
    UIScrollView *scrollView = (UIScrollView *)[self.view viewWithTag:100];
    [scrollView setContentOffset:CGPointMake(320*pageControl.currentPage, 0) animated:YES];
    NSLog(@"%f",scrollView.contentOffset.x);
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}