IOS初级:UIScrollView & UIPageControl
2015-07-13 14:48
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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。
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{
}
//主屏幕高度 #define kScreenHeight [UIScreen mainScreen].bounds.size.height //主屏幕宽度 #define kScreenWidth [UIScreen mainScreen].bounds.size.width CGFloat 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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