IOS初级：UIScrollView & UIPageControl

来源：互联网发布：java输出语句换行符编辑：程序博客网时间：2024/06/06 09:10

UIScrollView其实构建的就像一列很长的火车，每滑动一个屏幕，展示一节车厢。

//主屏幕高度#define kScreenHeight [UIScreen mainScreen].bounds.size.height //主屏幕宽度#define kScreenWidth [UIScreen mainScreen].bounds.size.widthCGFloat kImgCount = 10;CGFloat scrollY = 20;  //scrollView距离屏幕顶部的距离CGFloat pageCtrlWidth = 200;@property (nonatomic, strong) UIScrollView *scrollView;@property (nonatomic, strong) UIPageControl *pageCtrl;  //构建UIScrollView代码self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, scrollY, kScreenWidth, kScreenHeight - scrollY)];self.scrollView.delegate = self;for (int i = 0; i<kImgCount; i++) {UIImageView *imgview = [[UIImageView alloc] initWithFrame:CGRectMake(kScreenWidth * i, scrollY, kScreenWidth, kScreenHeight - scrollY)];imgview.image = [UIImage imageNamed:[NSString stringWithFormat:@"news%04d",i]];[self.scrollView addSubview:imgview];}self.scrollView.contentSize = CGSizeMake(kScreenWidth * kImgCount, kScreenHeight - scrollY);//设置这一列火车的总长度self.scrollView.pagingEnabled = YES;//分页显示[self.view addSubview:self.scrollView];//构建UIPageControl代码self.pageCtrl = [[UIPageControl alloc] initWithFrame:CGRectMake((kScreenWidth - pageCtrlWidth)/2, kScreenHeight - scrollY, pageCtrlWidth, scrollY)];self.pageCtrl.numberOfPages = kImgCount;self.pageCtrl.pageIndicatorTintColor = [UIColor greenColor];self.pageCtrl.currentPageIndicatorTintColor = [UIColor yellowColor];[self.view insertSubview:self.pageCtrl aboveSubview:self.scrollView];

UIScrollView常用代理方法

//当视图滑动时- (void)scrollViewDidScroll:(UIScrollView *)scrollView{}// 当视图将要拖动的时候- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{}//当视图停止拖拽的时候调用- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{}

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