轮播图

//

//ViewController.m

//轮播图

//

//Created by lanouhn on 16/7/13.

//Copyright © 2016年lanouhn. All rights

reserved.

//

//

#import"ViewController.h"

@interfaceViewController()

#define screenWidth [UIScreenmainScreen].bounds.size.width

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

/*UIPageControlnumOfPages

currentPage

*/

@property(nonatomic,strong)UIPageControl*pageControl;

//滑动视图UIScrollView,自带了可滑动功能

@property(nonatomic,strong)UIScrollView*scrollView;

@end

@implementationViewController

- (void)viewDidLoad {

[superviewDidLoad];

//创建初始化滑动视图

//[UIScreen

mainScreen].bounds]:包含了屏幕的尺寸

self.scrollView= [[UIScrollViewalloc]initWithFrame:[UIScreenmainScreen].bounds];

for(NSIntegeri =0; i <6; i++) {

//根据i循环创建UIImageView。再添加到滑动视图scrollView上面

UIImageView*imageView = [[UIImageViewalloc]initWithFrame:CGRectMake(i*screenWidth,0,screenWidth,screenHeight)];

NSString*imageName =nil;

if(i ==5) {

imageName =@"1.jpg";

}else{

imageName = [NSStringstringWithFormat:@"%ld.jpg",i+1];

}

//加载响应的图片

UIImage*image = [UIImageimageNamed:imageName];

//设置图片

imageView.image= image;

//将imageView添加到滑动视图上去

[self.scrollViewaddSubview:imageView];

}

//添加滑动视图到屏幕上面

[self.viewaddSubview:self.scrollView];

//设置滑动视图区域contentSize

self.scrollView.contentSize=CGSizeMake(6*screenWidth,screenHeight);

//整屏翻转

self.scrollView.pagingEnabled=YES;

//边界回弹

self.scrollView.bounces=NO;

//设置代理,代理是负责监听滑动视图整个滑动过程的

self.scrollView.delegate=self;

//开启一个定时器

//TimeInterval:时间间隔

//每隔一定的时间间隔,target回去执行selecto这个方法

[NSTimerscheduledTimerWithTimeInterval:2target:selfselector:@selector(turnToNextImage)userInfo:nilrepeats:YES];

}

//定时器触发的方法:跳转到下一张图片

-(void)turnToNextImage

{

//先获取当前图片是第几张

NSIntegerindex =self.scrollView.contentOffset.x/screenWidth;

//跳转到下一张

[self.scrollViewsetContentOffset:CGPointMake((index+1)*screenWidth,0)animated:YES];

self.pageControl= [[UIPageControlalloc]initWithFrame:CGRectMake(130,665,150,20)];

self.pageControl.numberOfPages=5;

[self.viewaddSubview:self.pageControl];

}

//滑动动画结束的时候调用

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView*)scrollView;

{

//先获取当前下标

NSIntegerindex = scrollView.contentOffset.x/screenWidth;

//是最后一张就设置偏移量为0,0

if(index ==5) {

[scrollViewsetContentOffset:CGPointMake(0,0)animated:NO];

}

}

//滑动视图滑动的时候调用

- (void)scrollViewDidScroll:(UIScrollView*)scrollView

{

//contentOffset是访问到了滑动视图的偏移量,包含了x和y轴的偏移量

//setContentOffset:animated:

//NSLog(@"偏移量.x = %f,偏移量.y = %f",scrollView.contentOffset.x,scrollView.contentOffset.y);

}

// scrollView结束减速(停止)

- (void)scrollViewDidEndDecelerating:(UIScrollView*)scrollView

{

//判断是否为最后一张

NSIntegerindex = scrollView.contentOffset.x/screenWidth;

//==5表示最后一张图片,如果是最后一张图片就切换到第0张图片(设置偏移量为0,0)

if(index ==5) {

[scrollViewsetContentOffset:CGPointMake(0,0)animated:NO];

self.pageControl.currentPage=0;

}else{

self.pageControl.currentPage= index;

}

}

- (void)didReceiveMemoryWarning {

[superdidReceiveMemoryWarning];

}

@end

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