自动无限轮播图
前期工作,图片导入进来,定义宏
一/添加scrollView,设置为屏幕大小,并定义scrollView 的content size为图片数+2的宽度
二/将图片添加以循环的方式添加到scrollView上,并加以判断.第一张的位置添加图片的最后一个图(为了形成视觉欺骗);并在最后一张的位置添加第一张图(加以偏移量的处理可以达到无限滑动)
三/添加pageControl(小圆点)
四/添加timer,设置timer的属性
五/在timer的运行事件中,对轮播图做处理,图片便宜到最后一张的位置时,瞬间跳转到第二张图也就是真正第一张的位置;并且将pagecontroller的小圆点偏移到第一个的位置.
viewController.m
#import "secondViewController.h"
@interface secondViewController ()<UIScrollViewDelegate>
@end
@implementation secondViewController
#define WIDTH self.view.frame.size.width
#define HEIGHT self.view.frame.size.height
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.navigationItem.title = @"第二页";
// self.navigationController.navigationBar.translucent = NO;
self.automaticallyAdjustsScrollViewInsets = NO;
self.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"轮播图" image:[UIImage imageNamed:@"Unknown-1"] tag:222];
[self setScrollView];
[self setPageControl];
[self setTimer];
}
- (void)setTimer {
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(myTime:) userInfo:nil repeats:YES];
}
- (void)myTime:(NSTimer *)time{
UIScrollView *s = [self.view viewWithTag:111];
NSInteger i = s.contentOffset.x;
UIPageControl *pc = [self.view viewWithTag:300];
[s setContentOffset:CGPointMake(i + WIDTH, 0) animated:YES];
pc.currentPage = s.contentOffset.x/WIDTH;
if (s.contentOffset.x == WIDTH * 8) {
s.contentOffset = CGPointMake(0, 0);
pc.currentPage = 0;
}
}
- (void)setScrollView{
UIScrollView *scrollV = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];
scrollV.contentSize = CGSizeMake(10 * WIDTH, 0);
scrollV.tag = 111;
scrollV.pagingEnabled = YES;
scrollV.delegate = self;
scrollV.showsVerticalScrollIndicator = NO;
scrollV.showsHorizontalScrollIndicator = NO;
scrollV.contentOffset = CGPointMake(WIDTH, 0);
for (int i = 0; i < 10; i++) {
UIImageView *imageV = [[UIImageView alloc] initWithFrame:CGRectMake(WIDTH * i, 80, WIDTH, 250)];
imageV.tag = 200 + i;
if (i == 0) {
imageV.image = [UIImage imageNamed:[NSString stringWithFormat:@"8.jpg"]];
}else if (i == 9){
imageV.image = [UIImage imageNamed:[NSString stringWithFormat:@"1.jpg"]];
}else{
imageV.image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg", i]];
}
[scrollV addSubview:imageV];
[imageV release];
}
[self.view addSubview:scrollV];
[scrollV release];
}
- (void)setPageControl{
UIPageControl *pc = [[UIPageControl alloc] initWithFrame:CGRectMake(150, 300, 75, 30)];
pc.numberOfPages = 8;
[pc addTarget:self action:@selector(handlePC:) forControlEvents:UIControlEventValueChanged];
pc.tag = 300;
[self.view addSubview:pc];
[pc release];
}
#pragma mark - page点击事件
- (void)handlePC:(UIPageControl *)pc{
UIScrollView *scrollV = [self.view viewWithTag:111];
[scrollV setContentOffset:CGPointMake(pc.currentPage * WIDTH, 0) animated:YES];
}
#pragma mark - scroll代理时机
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
UIPageControl *pc = [self.view viewWithTag:300];
if (scrollView.contentOffset.x == 9 * WIDTH) {
pc.currentPage = 0;
scrollView.contentOffset = CGPointMake(WIDTH, 0);
}else if (scrollView.contentOffset.x == 0){
pc.currentPage = 7;
scrollView.contentOffset = CGPointMake(8 * WIDTH, 0);
}else{
pc.currentPage = scrollView.contentOffset.x / WIDTH - 1;
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end