UIPageController与UIScrollView的联合使用

最新推荐文章于 2019-02-18 17:00:01 发布

原创最新推荐文章于 2019-02-18 17:00:01 发布 · 319 阅读

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本文介绍了一个iOS视图控制器的初始化过程及如何实现分页滚动效果。通过自定义视图控制器，设置了背景图片，并使用UIScrollView实现了水平分页滚动功能。同时，UIPageControl用于指示当前页面，scrollViewDidScroll代理方法则用来更新当前页面。

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(id)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self) {

    // Initialization code

    _backImage = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height - 20)];

    _backImage.userInteractionEnabled = YES;

    _backImage.image = [UIImage imageNamed:@"教师讲题-互动.png"];

    [self addSubview:_backImage];



    _statisScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(7, 9, frame.size.width - 23, frame.size.height - 45)];

    _statisScrollView.contentSize = CGSizeMake(_statisScrollView.frame.size.width * 2, _statisScrollView.frame.size.height);

    _statisScrollView.backgroundColor = [UIColor clearColor];

    _statisScrollView.pagingEnabled = YES;

    _statisScrollView.showsHorizontalScrollIndicator = NO;

    _statisScrollView.delegate = self;

    [self addSubview:_statisScrollView];

    [_statisScrollView release];



    _pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, frame.size.height - 40, frame.size.width, 20)];

    _pageControl.backgroundColor = [UIColor clearColor];

    _pageControl.currentPage = 0;

    _pageControl.numberOfPages = 2;

    [_pageControl addTarget:self action:@selector(getChangePage:) forControlEvents:UIControlEventValueChanged];

    [self addSubview:_pageControl];

    [_pageControl release];



}

return self;

}

(void)getChangePage:(UIPageControl *)pageControl

{

int page = pageControl.currentPage;



CGRect frame = _statisScrollView.frame;

frame.origin.x = frame.size.width * page;//根据页数算要显示的第几页在scrollView的初始坐标

frame.origin.y = 0;

[_statisScrollView scrollRectToVisible:frame animated:YES];//根据坐标显示第几页

}

pragma mark UIScrollViewDelagete

(void)scrollViewDidScroll:(UIScrollView *)scrollView

{

CGFloat pageWidth = scrollView.frame.size.width;

int page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;//根据坐标算页数

_pageControl.currentPage = page;//页数赋值给pageControl的当前页

}