//
// ViewController.m
// 轮番图操作
//
// Created by lanou on 16/7/13.
// Copyright © 2016年 pingguo. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()<UIScrollViewDelegate>
#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;
//页面指示器
@property(nonatomic,strong)UIPageControl *pageControl;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 创建初始化滑动视图[UIScreen].bounds包含了屏幕尺寸
self.scrollView =[[UIScrollView alloc]initWithFrame:[UIScreen mainScreen].bounds];
for (NSInteger i=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=[[UIImageView alloc]initWithFrame:CGRectMake(i*screenWidth, 0, screenWidth, screenHeight)];
NSString *imageName=nil;
if (i==5) {
imageName=@"1.jpg";
}
else{
imageName=[NSString stringWithFormat:@"%ld.jpg",i+1];
}
// 加载响应的图片(只是加载到了内存上去)
UIImage *image=[UIImage imageNamed:imageName];
// 设置图片(即将相应的图片存储到相框中)
imageView.image=image;
// 将imageView添加到滑动视图上去
[self.scrollView addSubview:imageView];
}
// 添加滑动视图到屏幕上面
[self.view addSubview: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
// 每隔一定的时间间隔,target会去执行selector这个方法
// [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(turnToNextImage) userInfo:nil repeats:YES];
self.pageControl=[[UIPageControl alloc]initWithFrame:CGRectMake(80, 520, 150, 20)];
self.pageControl.numberOfPages=5;
[self.view addSubview: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
NSInteger index=self.scrollView.contentOffset.x/screenWidth;
// 跳转到下一张(设置偏移量)
[self.scrollView setContentOffset:CGPointMake((index+1)*screenWidth, 0) animated:YES];
}
// 滑动动画结束的时候调用
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
{
// 先获取当前下标
NSInteger index=scrollView.contentOffset.x/screenWidth;
// 是最后一张就设置偏移量为0,0
if (index==5) {
[scrollView setContentOffset:CGPointMake(0, 0)animated:NO];
self.pageControl.currentPage=0;
}
else{
self.pageControl.currentPage=index;
}
}
//滑动视图做滑动的时候调用
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
// contentOffset是访问到了滑动视图的偏移量,包含了x轴和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
NSInteger index=scrollView.contentOffset.x/screenWidth;
// ==5表示最后一张,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) {
[scrollView setContentOffset:CGPointMake(0, 0)animated:NO];
self.pageControl.currentPage=0;
}else{self.pageControl.currentPage=index;
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end