ios菜鸟之路：uiscrollview和pagecontrol的使用方法

一、UIScrollview以及pagecontrol的声明

@interface rootViewController : UIViewController<UIScrollViewDelegate>//加上scrollviewdelegate的协议

@property (strong, nonatomic) IBOutlet UIScrollView *scrollView;

@property (strong, nonatomic) IBOutlet UIPageControl *pageControl;

- (IBAction)pageTurn:(UIPageControl *)sender; //pagecontrol的界面转换方法

二、实现

scrollView=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 380)];//初始化scrollview的界面 （坐标x，坐标y，宽度，高度）屏幕左上角为原点

[scrollView setContentSize:CGSizeMake(960, 380)];//设置scrollview画布的大小，此设置为三页的宽度，380的高度。用来实现三页照片的转换。

scrollView.pagingEnabled=YES;//立刻翻页到下一页 没中间的拖动过程

scrollView.bounces=NO;//去掉翻页中的白屏

[scrollView setDelegate:self];

scrollView.showsHorizontalScrollIndicator=NO;//不现实水平滚动条

//将图像添加到scrollview中

UIImageView *imageview1=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 320, 380)];

[imageview1 setImage:[UIImage imageNamed:@"Default1.png"]];

UIImageView *imageview2=[[UIImageView alloc]initWithFrame:CGRectMake(320, 0, 320, 380)];

[imageview2 setImage:[UIImage imageNamed:@"Default2.png"]];

UIImageView *imageview3=[[UIImageView alloc]initWithFrame:CGRectMake(640, 0, 320, 380)];

[imageview3 setImage:[UIImage imageNamed:@"Default3.png"]];

[scrollView addSubview:imageview1];

[scrollView addSubview:imageview2];

[scrollView addSubview: imageview3];

[self.view addSubview:scrollView];

//将pagecontrol添加到scrollview中

pageControl=[[UIPageControl alloc]initWithFrame:CGRectMake(0, 350, 320, 30)];

pageControl.numberOfPages=3;

pageControl.currentPage=0;

[pageControl addTarget:self action:@selector(pageTurn:) forControlEvents:UIControlEventValueChanged];

[self.view addSubview:pageControl];

//pagecontrol的点跟着页数改变

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView1{

CGPoint offset=scrollView1.contentOffset;

CGRect bounds=scrollView1.frame;

[pageControl setCurrentPage:offset.x/bounds.size.width];

}

//点击pagecontrol的点 跳到那一页的实现

- (IBAction)pageTurn:(UIPageControl *)sender {

CGSize viewsize=scrollView.frame.size;

CGRect rect=CGRectMake(sender.currentPage*viewsize.width, 0, viewsize.width, viewsize.height);

[scrollView scrollRectToVisible:rect animated:YES];

}

以上内容只是多张图片的转换功能。scrollview是将一屏放不了的东西组织在一起的功能，在相册和地图中比较常见。

详细contentoffset及contentsize contentinset的介绍 请见http://blog.csdn.net/bl1988530/article/details/7043936