#import <UIKit/UIKit.h>
typedef enum _CycleDirection
{ PortaitDirection,LandscapeDirection } CycleDirection;
@interface CycleScrollView : UIView<UIScrollViewDelegate> {
UIScrollView *scrollView;
UIImageView *curImageView;
int totalPage;
int curPage;
CGRect scrollFrame;
CycleDirection scrollDirection; // 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"
@implementation CycleScrollView
- (id) initWithFrame:(CGRect)frame cycleDirection:(CycleDirection)direction pictures:(NSArray*)pictureArray
{
self=[super initWithFrame: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];
}
return self;
}
- (void) refreshScrollView
{
NSArray *subViews=[scrollView subviews];
if([subViews count]!=0)
{
[subViews makeObjectsPerformSelector:@selector(removeFromSuperview)];
}
[self getDisplayImagesWithCurpage: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];
[scrollView addSubview:preView];
[scrollView addSubview:curView];
[scrollView addSubview: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
{
int pre=[self validPageValue:curPage-1];
int last=[self validPageValue:curPage+1];
if([curImages count]!=0) [curImages removeAllObjects];
[curImages addObject:[imagesArray objectAtIndex:pre-1]];
[curImages addObject:[imagesArray objectAtIndex:curPage-1]];
[curImages addObject:[imagesArray objectAtIndex:last-1]];
return curImages;
}
- (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;
return value;
}
- (void) scrollViewDidScroll:(UIScrollView *)crollView
{
int x=crollView.contentOffset.x;
int y=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];
}
}
}
- (void)dealloc
{
[imagesArray release];
[curImages release];
[super dealloc];
}
@end
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