iOS学习笔记——滚动视图（scrollView）

@interface BoViewController : UIViewController<UIScrollViewDelegate>  
//滚动视图对象  
@property (retain, nonatomic) UIScrollView *scrollView;  
//视图中小圆点，对应视图的页码  
@property (retain, nonatomic) UIPageControl *pageControl;  
//动态数组对象，存储图片  
@property (retain, nonatomic) NSMutableArray *images;  
@end  
/* 何问起 hovertree.com */

- (void)viewDidLoad { [super viewDidLoad]; //初始化scrollView  self.scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 345)]; //初始化pageControl  self.pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, 344, 320, 36)]; //初始化数组，存储滚动视图的图片  self.images = [NSMutableArray arrayWithObjects:[UIImage imageNamed:@"text1.png"],[UIImage imageNamed:@"text2.png"],[UIImage imageNamed:@"text3.png"],[UIImage imageNamed:@"text4.png"], nil nil]; //把scrollView与pageControl添加到当前视图中   [self.view addSubview:self.scrollView]; [self.view addSubview:self.pageControl]; //设置视图的背景颜色  self.view.backgroundColor = [UIColor blackColor]; //调用 setuoPage方法   [self setupPage:nil]; } //改变滚动视图的方法实现  - (void)setupPage:(id)sender { //设置委托  self.scrollView.delegate = self; //设置背景颜色  self.scrollView.backgroundColor = [UIColor blackColor]; //设置取消触摸  self.scrollView.canCancelContentTouches = NO; //设置滚动条类型  self.scrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite; //是否自动裁切超出部分  self.scrollView.clipsToBounds = YES; //设置是否可以缩放  self.scrollView.scrollEnabled = YES; //设置是否可以进行画面切换  self.scrollView.pagingEnabled = YES; //设置在拖拽的时候是否锁定其在水平或者垂直的方向  self.scrollView.directionalLockEnabled = NO; //隐藏滚动条设置（水平、跟垂直方向）  self.scrollView.alwaysBounceHorizontal = NO; self.scrollView.alwaysBounceVertical = NO; self.scrollView.showsHorizontalScrollIndicator = NO; self.scrollView.showsVerticalScrollIndicator = NO; //用来记录页数  NSUInteger pages = 0; //用来记录scrollView的x坐标  int originX = 0; for(UIImage *image in self.images) { //创建一个视图  UIImageView *pImageView = [[[UIImageView alloc]initWithFrame:CGRectZero]autorelease]; //设置视图的背景色  pImageView.backgroundColor = [UIColor colorWithRed:0.6 green:0.6 blue:0.6 alpha:1.0]; //设置imageView的背景图   [pImageView setImage:image]; //给imageView设置区域  CGRect rect = self.scrollView.frame; rect.origin.x = originX; rect.origin.y = 0; rect.size.width = self.scrollView.frame.size.width; rect.size.height = self.scrollView.frame.size.height; pImageView.frame = rect; //设置图片内容的显示模式(自适应模式)  pImageView.contentMode = UIViewContentModeScaleAspectFill; //把视图添加到当前的滚动视图中   [self.scrollView addSubview:pImageView]; //下一张视图的x坐标:offset为:self.scrollView.frame.size.width.  originX += self.scrollView.frame.size.width; //记录scrollView内imageView的个数  pages++; } //设置页码控制器的响应方法   [self.pageControl addTarget:self action:@selector(changePage:) forControlEvents:UIControlEventValueChanged]; //设置总页数  self.pageControl.numberOfPages = pages; //默认当前页为第一页  self.pageControl.currentPage = 0; //为页码控制器设置标签  self.pageControl.tag = 110; //设置滚动视图的位置   [self.scrollView setContentSize:CGSizeMake(originX, self.scrollView.bounds.size.height)]; } //改变页码的方法实现  - (void)changePage:(id)sender { NSLog(@"指示器的当前索引值为:%i",self.pageControl.currentPage); //获取当前视图的页码  CGRect rect = self.scrollView.frame; //设置视图的横坐标，一幅图为320*460，横坐标一次增加或减少320像素  rect.origin.x = self.pageControl.currentPage * self.scrollView.frame.size.width; //设置视图纵坐标为0  rect.origin.y = 0; //scrollView可视区域   [self.scrollView scrollRectToVisible:rect animated:YES]; } #pragma mark-----UIScrollViewDelegate--------- //实现协议UIScrollViewDelegate的方法，必须实现的  - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { //获取当前视图的宽度  CGFloat pageWith = scrollView.frame.size.width; //根据scrolView的左右滑动,对pageCotrol的当前指示器进行切换(设置currentPage)  int page = floor((scrollView.contentOffset.x - pageWith/2)/pageWith)+1; //切换改变页码，小圆点  self.pageControl.currentPage = page; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.  } //释放创建的对象  - (void)dealloc { [_pageControl release]; [_scrollView release]; [super dealloc]; } /* 何问起 hovertree.com */