ios控件UIScrollView

#import "KCMainViewController.h"#define SCREEN_WIDTH 320#define SCREEN_HEIGHT 568#define IMAGEVIEW_COUNT 3@interface KCMainViewController ()<UIScrollViewDelegate>{    UIScrollView *_scrollView;    UIImageView *_leftImageView;    UIImageView *_centerImageView;    UIImageView *_rightImageView;    UIPageControl *_pageControl;    UILabel *_label;    NSMutableDictionary *_imageData;//图片数据    int _currentImageIndex;//当前图片索引    int _imageCount;//图片总数}@end@implementation KCMainViewController- (void)viewDidLoad {    [super viewDidLoad];    //加载数据    [self loadImageData];    //添加滚动控件    [self addScrollView];    //添加图片控件    [self addImageViews];    //添加分页控件    [self addPageControl];    //添加图片信息描述控件    [self addLabel];    //加载默认图片    [self setDefaultImage];}#pragma mark 加载图片数据-(void)loadImageData{    //读取程序包路径中的资源文件    NSString *path=[[NSBundle mainBundle] pathForResource:@"imageInfo" ofType:@"plist"];    _imageData=[NSMutableDictionary dictionaryWithContentsOfFile:path];    _imageCount=(int)_imageData.count;}#pragma mark 添加控件-(void)addScrollView{    _scrollView=[[UIScrollView alloc]initWithFrame:[UIScreen mainScreen].bounds];    [self.view addSubview:_scrollView];    //设置代理    _scrollView.delegate=self;    //设置contentSize    _scrollView.contentSize=CGSizeMake(IMAGEVIEW_COUNT*SCREEN_WIDTH, SCREEN_HEIGHT) ;    //设置当前显示的位置为中间图片    [_scrollView setContentOffset:CGPointMake(SCREEN_WIDTH, 0) animated:NO];    //设置分页    _scrollView.pagingEnabled=YES;    //去掉滚动条    _scrollView.showsHorizontalScrollIndicator=NO;}#pragma mark 添加图片三个控件-(void)addImageViews{    _leftImageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];    _leftImageView.contentMode=UIViewContentModeScaleAspectFit;    [_scrollView addSubview:_leftImageView];    _centerImageView=[[UIImageView alloc]initWithFrame:CGRectMake(SCREEN_WIDTH, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];    _centerImageView.contentMode=UIViewContentModeScaleAspectFit;    [_scrollView addSubview:_centerImageView];    _rightImageView=[[UIImageView alloc]initWithFrame:CGRectMake(2*SCREEN_WIDTH, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];    _rightImageView.contentMode=UIViewContentModeScaleAspectFit;    [_scrollView addSubview:_rightImageView];}#pragma mark 设置默认显示图片-(void)setDefaultImage{    //加载默认图片    _leftImageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",_imageCount-1]];    _centerImageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",0]];    _rightImageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",1]];    _currentImageIndex=0;    //设置当前页    _pageControl.currentPage=_currentImageIndex;    NSString *imageName=[NSString stringWithFormat:@"%i.jpg",_currentImageIndex];    _label.text=_imageData[imageName];}#pragma mark 添加分页控件-(void)addPageControl{    _pageControl=[[UIPageControl alloc]init];    //注意此方法可以根据页数返回UIPageControl合适的大小    CGSize size= [_pageControl sizeForNumberOfPages:_imageCount];    _pageControl.bounds=CGRectMake(0, 0, size.width, size.height);    _pageControl.center=CGPointMake(SCREEN_WIDTH/2, SCREEN_HEIGHT-100);    //设置颜色    _pageControl.pageIndicatorTintColor=[UIColor colorWithRed:193/255.0 green:219/255.0 blue:249/255.0 alpha:1];    //设置当前页颜色    _pageControl.currentPageIndicatorTintColor=[UIColor colorWithRed:0 green:150/255.0 blue:1 alpha:1];    //设置总页数    _pageControl.numberOfPages=_imageCount;        [self.view addSubview:_pageControl];}#pragma mark 添加信息描述控件-(void)addLabel{        _label=[[UILabel alloc]initWithFrame:CGRectMake(0, 10, SCREEN_WIDTH,30)];    _label.textAlignment=NSTextAlignmentCenter;    _label.textColor=[UIColor colorWithRed:0 green:150/255.0 blue:1 alpha:1];    [self.view addSubview:_label];}#pragma mark 滚动停止事件-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{    //重新加载图片    [self reloadImage];    //移动到中间    [_scrollView setContentOffset:CGPointMake(SCREEN_WIDTH, 0) animated:NO];    //设置分页    _pageControl.currentPage=_currentImageIndex;    //设置描述    NSString *imageName=[NSString stringWithFormat:@"%i.jpg",_currentImageIndex];    _label.text=_imageData[imageName];}#pragma mark 重新加载图片-(void)reloadImage{    int leftImageIndex,rightImageIndex;    CGPoint offset=[_scrollView contentOffset];    if (offset.x>SCREEN_WIDTH) { //向右滑动        _currentImageIndex=(_currentImageIndex+1)%_imageCount;    }else if(offset.x<SCREEN_WIDTH){ //向左滑动        _currentImageIndex=(_currentImageIndex+_imageCount-1)%_imageCount;    }    //UIImageView *centerImageView=(UIImageView *)[_scrollView viewWithTag:2];    _centerImageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",_currentImageIndex]];        //重新设置左右图片    leftImageIndex=(_currentImageIndex+_imageCount-1)%_imageCount;    rightImageIndex=(_currentImageIndex+1)%_imageCount;    _leftImageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",leftImageIndex]];    _rightImageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"%i.jpg",rightImageIndex]];}@end