循环滚动UIScrollView(无点击事件处理)

1.创建一个继承UIView的名为CycleScrollView的类(.h和.m文件)
2.将下面代码替换原默认代码
3.在你的类里面实例化一个CycleScrollView类的对象并用
-(id)initWithFrame:(CGRect)framecycleDirection:(CycleDirection)directionpictures: (NSArray*)pictureArray
进行初始化
参数介绍：
frame 页面的位置和大小
direction 滚动的方向，0垂直滚动，1水平滚动
pictures 滚动的图片数组
比如：
 - (void)viewDidLoad
 {
 [super viewDidLoad];
 NSArray *imagesArray=[[NSArray alloc] initWithObjects:[UIImage           imageNamed:@"test1.jpg"],[UIImageimageNamed:@"test2.jpg"],[UIImageimageNamed:@"test3.jpg"],nil];
 CycleScrollView *cycle=[[CycleScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)     cycleDirection:0pictures:imagesArray];
 cycle.delegate=self;
 [self.view addSubview:cycle];
 [imagesArray release];
 [cycle release];
 }
/////////////////////////////////////////////////////////////////////////////
.h文件
#import <UIKit/UIKit.h>
typedef  enum _CycleDirection
{ PortaitDirection,LandscapeDirection } CycleDirection;
@interface CycleScrollView :UIView<UIScrollViewDelegate> {
  UIScrollView*scrollView;
  UIImageView*curImageView;
  inttotalPage; 
  intcurPage;
  CGRectscrollFrame;
 CycleDirectionscrollDirection; // scrollView滚动的方向
  NSArray*imagesArray;  //存放所有需要滚动的图片
 NSMutableArray *curImages; //存放当前滚动的三张图片
}
- (int) validPageValue:(NSInteger)value;
- (id) initWithFrame:(CGRect)framecycleDirection:(CycleDirection)directionpictures:(NSArray*)pictureArray;
- (NSArray*) getDisplayImagesWithCurpage:(int)page;
- (void) refreshScrollView;
@end
/////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////
.m文件
#import "CycleScrollView.h"
@implementation CycleScrollView
- (id) initWithFrame:(CGRect)framecycleDirection:(CycleDirection)directionpictures:(NSArray*)pictureArray
{
  self=[superinitWithFrame:frame];
 if(self)
  {
 scrollFrame=frame;
 scrollDirection=direction;
 totalPage=[pictureArray count];
 curPage=1;  //当前显示的是图片数组里的第一张图片
 curImages=[[NSMutableArray alloc] init];
 imagesArray=[[NSArray alloc] initWithArray:pictureArray];
 scrollView=[[UIScrollView alloc] initWithFrame:frame];
 scrollView.backgroundColor=[UIColor blueColor];
 scrollView.showsHorizontalScrollIndicator=NO;
 scrollView.showsVerticalScrollIndicator=NO;
 scrollView.pagingEnabled=YES;
 scrollView.delegate=self;
 [self addSubview:scrollView];
 if(scrollDirection==PortaitDirection) //在竖直方向滚动
 {
 scrollView.contentSize=CGSizeMake(scrollView.frame.size.width,scrollView.frame.size.height*3); //竖直方法可以存放三张图片
 }
 if(scrollDirection==LandscapeDirection) //在水平方向滚动
 {
 scrollView.contentSize=CGSizeMake(scrollView.frame.size.width*3,scrollView.frame.size.height);
 }
 [self addSubview:scrollView];
 [self refreshScrollView];
  }
  returnself;
}
- (void) refreshScrollView
{
  NSArray*subViews=[scrollView subviews];
  if([subViewscount]!=0)
  {
 [subViewsmakeObjectsPerformSelector:@selector(removeFromSuperview)];
  }
  [selfgetDisplayImagesWithCurpage:curPage];
  UIImage*preImage=[curImages objectAtIndex:0];
  UIImage*curImage=[curImages objectAtIndex:1];
  UIImage*lastImage=[curImages objectAtIndex:2];
  UIImageView*preView=[[UIImageView alloc] initWithImage:preImage];
  UIImageView*curView=[[UIImageView alloc] initWithImage:curImage];
  UIImageView*lastView=[[UIImageView alloc] initWithImage:lastImage];
  [scrollViewaddSubview:preView];
  [scrollViewaddSubview:curView];
  [scrollViewaddSubview:lastView];
  [preView  release];
  [curView  release];
  [lastView  release];
 if(scrollDirection==PortaitDirection) //竖直滚动
  {
 preView.frame=CGRectOffset(preView.frame, 0, 0);
     curView.frame=CGRectOffset(curView.frame, 0,scrollFrame.size.height);
 lastView.frame=CGRectOffset(lastView.frame, 0,2*scrollFrame.size.height);
 [scrollView setContentOffset:CGPointMake(0,scrollFrame.size.height)];
  }
 if(scrollDirection==LandscapeDirection) //水平滚动
  {
 preView.frame=CGRectOffset(preView.frame, 0, 0);
 curView.frame=CGRectOffset(curView.frame, scrollFrame.size.width,0);
 lastView.frame=CGRectOffset(lastView.frame,scrollFrame.size.width*2, 0);
     [scrollView setContentOffset:CGPointMake(scrollFrame.size.width,0)];
  }
}
- (NSArray*) getDisplayImagesWithCurpage:(int)page
{
 intpre=[self validPageValue:curPage-1];
  intlast=[self validPageValue:curPage+1];
 if([curImagescount]!=0) [curImages removeAllObjects];
  [curImagesaddObject:[imagesArray objectAtIndex:pre-1]];
  [curImagesaddObject:[imagesArray objectAtIndex:curPage-1]];
  [curImagesaddObject:[imagesArray objectAtIndex:last-1]];
  returncurImages;
}
- (int)validPageValue:(NSInteger)value
{
 if(value==0) value=totalPage; //value＝1为第一张，value=0为前面一张
 if(value==totalPage+1)
value=1;
  returnvalue;
}
- (void) scrollViewDidScroll:(UIScrollView *)crollView
{
  intx=crollView.contentOffset.x;
  inty=crollView.contentOffset.y;
 if(scrollDirection==LandscapeDirection) //水平滚动
  {
 if(x>=2*scrollFrame.size.width) //往下翻一张
 {
 curPage=[self validPageValue:curPage+1];
 [self refreshScrollView];
 }
 if(x<=0)
 {
 curPage=[self validPageValue:curPage-1];
    [self refreshScrollView];
      }
}
  //竖直滚动
 if(scrollDirection==PortaitDirection)
  {
 if(y>=2*scrollFrame.size.height){
 curPage=[self validPageValue:curPage+1];
 [self refreshScrollView];
 }
 if (y<=0) {
    curPage=[self validPageValue:curPage-1];
 [self refreshScrollView];
 }
}
}
- (void)dealloc
{
  [imagesArray release];
  [curImages  release];
  [super  dealloc];
}
@end