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因为昨天在网上找了很久，很多只能实现向右滚动，而且一张图一个imageview ，感觉工作量很可怕啊 ， 下面的例子就是不论你多少图 ， 只和我代码里面的几个数值有关， 只需要修改分页和循环i的最大值，当然为了方便 ， 您最好把图片的名字改成有序的 。 方便您添加到可变集合中。
如果这样的页面你有五页 或则更多都可以实现好像从最后一张图跳到第一张图。
这个其实总共只有3个image，图都是用循环加进去的 。
上代码
#import <UIKit/UIKit.h> #define WIDTH self.view.bounds.size.width #define HEIGHT self.view.bounds.size.height @interface ViewController : UIViewController<UIScrollViewDelegate> @property(strong,nonatomic) UIScrollView *scrollview; @property(strong,nonatomic) UIPageControl *pagecontrol; //存储图片 @property(strong,nonatomic) NSMutableArray * imageArray; //当前页码 @property(assign,nonatomic) int currentPage; //存储图片 @property(strong,nonatomic) UIImageView * firstImage; @property(strong,nonatomic) UIImageView * secondImage; @property(strong,nonatomic) UIImageView *thirdImage; @end
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.scrollview=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 20, WIDTH,HEIGHT )];
self.scrollview.contentSize=CGSizeMake(WIDTH*3, 0);
//是否分页
self.scrollview.pagingEnabled=YES;
//添加代理
self.scrollview.delegate=self;
//隐藏滚动条
self.scrollview.showsHorizontalScrollIndicator=NO;
[self.view addSubview:self.scrollview];
self.pagecontrol=[[UIPageControl alloc]initWithFrame:CGRectMake(WIDTH/5*3, HEIGHT/5*4, WIDTH/3, 40)];
//设置当前页
self.pagecontrol.currentPage=0;
//分页
self.pagecontrol.numberOfPages=5;
//指定页码颜色
self.pagecontrol.currentPageIndicatorTintColor=[UIColor redColor];
self.pagecontrol.pageIndicatorTintColor=[UIColor blueColor];
[self.view addSubview:self.pagecontrol];
//初始化存储图片的集合
self.imageArray=[NSMutableArray array];
for (int i=1; i<6; i++) {
UIImage *image=[UIImage imageNamed:[NSString stringWithFormat:@"%d",i]];
[self.imageArray addObject:image];
}
self.firstImage=[[UIImageView alloc]init];
self.secondImage=[[UIImageView alloc]init];
self.thirdImage=[[UIImageView alloc]init];
//当前页码
self.currentPage=0;
[self reloadImage];
}
-(void)reloadImage
{
//第一种情况 ， 第一页
if (self.currentPage==0) {
self.firstImage.image=[self.imageArray lastObject];
self.secondImage.image = [self.imageArray objectAtIndex:self.currentPage];
self.thirdImage.image = [self.imageArray objectAtIndex:self.currentPage + 1];
}
// 第二种情况 最后一页
else if (self.currentPage == self.imageArray.count - 1) {
self.firstImage.image = [self.imageArray objectAtIndex:self.currentPage - 1];
self.secondImage.image = [self.imageArray objectAtIndex:self.currentPage];
self.thirdImage.image = [self.imageArray objectAtIndex:0];
}
// 第三种情况 中间页
else {
self.firstImage.image = [self.imageArray objectAtIndex:self.currentPage - 1];
self.secondImage.image = [self.imageArray objectAtIndex:self.currentPage];
self.thirdImage.image = [self.imageArray objectAtIndex:self.currentPage + 1];
}
self.firstImage.frame = CGRectMake(0, 0, WIDTH, HEIGHT);
self.secondImage.frame = CGRectMake(WIDTH, 0, WIDTH, HEIGHT);
self.thirdImage.frame = CGRectMake(WIDTH* 2, 0, WIDTH, HEIGHT);
[self.scrollview addSubview:self.firstImage];
[self.scrollview addSubview:self.secondImage];
[self.scrollview addSubview:self.thirdImage];
self.scrollview.contentOffset = CGPointMake(WIDTH, 0);
}
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
float x= self.scrollview.contentOffset.x;
//向左
if (x<0||x==0) {
if (self.currentPage==0) {
self.currentPage=(int)self.imageArray.count-1;
}
else{
self.currentPage--;
}
}
//向右
if (x > WIDTH * 2 || x == WIDTH * 2) {
if (self.currentPage == (int)self.imageArray.count - 1) {
self.currentPage = 0;
}
else {
self.currentPage++ ;
}
}
self.pagecontrol.currentPage = self.currentPage;
[self reloadImage];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
UIscrollView和UIPageControl的循环滚动
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原文地址：http://www.cnblogs.com/fume/p/5268216.html
