轮播图

2016-07-13  本文已影响0人  染小沫

//

//  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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