轮播图

//

//  ViewController.m

//轮播图

//

//  Created by lanou on 16/7/13.

//  Copyright © 2016年lanou. All rights reserved.

//

#import"ViewController.h"

@interfaceViewController()

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

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

@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

[self.scrollViewaddSubview:imageView];

}

//添加滑动视图到屏幕上

[self.viewaddSubview:self.scrollView];

//设置滑动视图的滑动区域contentSize

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

//整屏翻转

self.scrollView.pagingEnabled=YES;

//边界回弹

self.scrollView.bounces=YES;

//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

//每隔一定的时间隔，target会去执行selector这个方法

//    [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(turnToNextImage) userInfo:(nil) repeats:YES];

self.pageControl=[[UIPageControlalloc]initWithFrame:CGRectMake(80,500,150,20)];

self.pageControl.numberOfPages=5;

[self.viewaddSubview:self.pageControl];

}

//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(设置偏移量)

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

}

//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(@"offset.x=%f,offset.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:YES];

self.pageControl.currentPage=0;

}else{

self.pageControl.currentPage=index;

}

}

//滑动结束的时候调用

- (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];

self.pageControl.currentPage=0;

}else{

self.pageControl.currentPage=index;

}

}

- (void)didReceiveMemoryWarning {

[superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end