（广告栏常用的）循环滚动的scrollview
#import <UIKit/UIKit.h>
typedefenum_CycleDirection
{ PortaitDirection,LandscapeDirection } CycleDirection;
@interfaceCycleScrollView : 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)frame cycleDirection:(CycleDirection)direction pictures:(NSArray*)pictureArray;
- (NSArray*) getDisplayImagesWithCurpage:(int)page;
- (void) refreshScrollView;
@end
//
// CycleScrollView.m
// CycleScrollView
//
// Created by mini5 on 28/07/2011.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import "CycleScrollView.h"
@implementationCycleScrollView
- (id) initWithFrame:(CGRect)frame cycleDirection:(CycleDirection)direction pictures:(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=[[NSMutableArrayalloc] init];
imagesArray=[[NSArrayalloc] initWithArray:pictureArray];
scrollView=[[UIScrollViewalloc] initWithFrame:frame];
scrollView.backgroundColor=[UIColorblueColor];
scrollView.showsHorizontalScrollIndicator=NO;
scrollView.showsVerticalScrollIndicator=NO;
scrollView.pagingEnabled=YES;
scrollView.delegate=self;
[selfaddSubview: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);
}
[selfaddSubview:scrollView];
[selfrefreshScrollView];
}
returnself;
}
- (void) refreshScrollView
{
NSArray*subViews=[scrollViewsubviews];
if([subViews count]!=0)
{
[subViews makeObjectsPerformSelector:@selector(removeFromSuperview)];
}
[selfgetDisplayImagesWithCurpage:curPage];
UIImage*preImage=[curImagesobjectAtIndex:0];
UIImage*curImage=[curImagesobjectAtIndex:1];
UIImage*lastImage=[curImagesobjectAtIndex:2];
UIImageView*preView=[[UIImageViewalloc] initWithImage:preImage];
UIImageView*curView=[[UIImageViewalloc] initWithImage:curImage];
UIImageView*lastView=[[UIImageViewalloc] 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);
[scrollViewsetContentOffset: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);
[scrollViewsetContentOffset:CGPointMake(scrollFrame.size.width, 0)];
}
}
- (NSArray*) getDisplayImagesWithCurpage:(int)page
{
intpre=[selfvalidPageValue:curPage-1];
intlast=[selfvalidPageValue:curPage+1];
if([curImagescount]!=0) [curImagesremoveAllObjects];
[curImagesaddObject:[imagesArrayobjectAtIndex:pre-1]];
[curImagesaddObject:[imagesArrayobjectAtIndex:curPage-1]];
[curImagesaddObject:[imagesArrayobjectAtIndex: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=[selfvalidPageValue:curPage+1];
[selfrefreshScrollView];
}
if(x<=0)
{
curPage=[selfvalidPageValue:curPage-1];
[selfrefreshScrollView];
}
}
//竖直滚动
if(scrollDirection==PortaitDirection)
{
if(y==2*scrollFrame.size.height)
{
curPage=[selfvalidPageValue:curPage+1];
[selfrefreshScrollView];
}
}
}
- (void)dealloc
{
[imagesArrayrelease];
[curImagesrelease];
[superdealloc];
}
@end
转载自http://blog.sina.com.cn/s/blog_93f39bc20100vgsd.html