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
