轮播图

作者: 染小沫 | 来源:发表于2016-07-13 19:35 被阅读0次

    //

    //  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

    /*

    UIPageControl    numOfPages   currentPage

    */

    //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 <5;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;//[NSString stringWithFormat:@"%ld.jpg",i+1];

    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添加到滑动视图上面去

    [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=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

    //每隔一定时间间隔,target会去执行selector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

    NSUIntegerindex =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:设置偏移量

    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(设置偏移量为0,0)

    if(index ==5){

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

    }

    }

    //滑动动画结束的时候调用

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

    //先获取当前下标,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(设置偏移量为0,0)

    if(index ==5){

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

    }

    }

    - (void)didReceiveMemoryWarning {

    [superdidReceiveMemoryWarning];

    }

    @end

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