循环滑动

//

//ViewController.m

//循环滑动

#import"ViewController.h"

#define kScreenWidth[UIScreen mainScreen].bounds.size.width

#define kScreenHeight[UIScreen mainScreen].bounds.size.height

@interfaceViewController()

{

UIScrollView* scrollView;

UIPageControl* pageCtr;

}

@end

@implementationViewController

- (void)viewDidLoad {

[superviewDidLoad];

//1:创建视图(scrollView,pageCtr)

[selfcreateScrollViewPageCtr];

}

- (void)createScrollViewPageCtr{

//1:创建scrollView

scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0,0, kScreenWidth, kScreenHeight)];

//最重要的属性滑动的范围

scrollView.contentSize = CGSizeMake(kScreenWidth*8, kScreenHeight);

//循环添加imageView

for(inti =0; i <6; i++)

{

//获取图片的名字

NSString *imageName = [NSString stringWithFormat:@"%i.jpg",i+1];

NSLog(@"%@",imageName);

//创建imageView

UIImageView * iamgeView = [[UIImageView alloc] initWithFrame:CGRectMake((i+1)*kScreenWidth,0, kScreenWidth, kScreenHeight)];

iamgeView.image = [UIImage imageNamed:imageName];

[scrollView addSubview:iamgeView];

}

[self.view addSubview:scrollView];

//添加到第1张前面

UIImageView *imageView1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"6.jpg"]];

imageView1.frame = CGRectMake(0,0, kScreenWidth, kScreenHeight);

[scrollView addSubview:imageView1];

//添加第5后面的第一张

UIImageView *imageView5 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1.jpg"]];

imageView5.frame = CGRectMake(kScreenWidth*7,0, kScreenWidth, kScreenHeight);

[scrollView addSubview:imageView5];

//--------------------------------------

scrollView.contentOffset = CGPointMake(kScreenWidth,0);

//--------------------------------------

//属性分页

scrollView.pagingEnabled =YES;

//设置代理对象

scrollView.delegate =self;

//2:创建pageCtr

pageCtr = [[UIPageControl alloc] initWithFrame:CGRectMake(0, kScreenHeight/2, kScreenWidth,30)];

//属性

pageCtr.numberOfPages =6;

pageCtr.pageIndicatorTintColor = [UIColor grayColor];

pageCtr.currentPageIndicatorTintColor= [UIColor whiteColor];

//pageCtr.currentPage = 0;

//添加值改变的方法

[pageCtr addTarget:selfaction:@selector(pageCtrAction) forControlEvents:UIControlEventValueChanged];

//[pageCtr updateCurrentPageDisplay];

[self.view addSubview:pageCtr];

}

- (void)pageCtrAction{

//获取当前的pageCtr.currentPage当前页数

CGPoint point = CGPointMake(pageCtr.currentPage * kScreenWidth,0);

scrollView.contentOffset = point;

}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

if(scrollView.contentOffset.x ==2240) {

scrollView.contentOffset = CGPointMake(kScreenWidth,0);

pageCtr.currentPage =0;

}

if(scrollView.contentOffset.x==0) {

scrollView.contentOffset = CGPointMake(kScreenWidth*6,0);

pageCtr.currentPage =6;

}

pageCtr.currentPage = scrollView.contentOffset.x / kScreenWidth-1;

NSLog(@"pageCtr.currentPage=%li",pageCtr.currentPage);

//NSLog(@"scrollView.contentOffset.x:%f",);

}

@end