图片轮播器代码实现（OC）带PageControl

//
//  ViewController.m
//  09-pageControl
//
//  Created by wangAngelo on 11/30/15.
//  Copyright © 2015 angelowang. All rights reserved.
//

#import "ViewController.h"

@interface ViewController () <UIScrollViewDelegate>
@property (weak, nonatomic) IBOutlet UIScrollView *scrollView;
@property (weak, nonatomic) IBOutlet UIPageControl *pageControl;
@property (nonatomic, strong) NSTimer *timer;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.scrollView.delegate = self;

    /**
     *  scrollView中图片轮播部分
     */
    CGFloat imagesW = self.scrollView.bounds.size.width;
    CGFloat imagesH = self.scrollView.bounds.size.height;
    /**
     *  设置图片数量和图片的总宽度
     */
    int imagesCount = 5;
    CGFloat totalImageWidth = imagesCount * imagesW;
    
    /**
     *  把每个图片的imageView加到ScrollView上
     */
    for (int i = 0; i < imagesCount; i++) {
        UIImageView *images = [[UIImageView alloc] init];
        CGFloat imagesX = i * imagesW;
        CGFloat imagesY = 0;
        images.frame = CGRectMake(imagesX, imagesY, imagesW, imagesH);
        images.image = [UIImage imageNamed:[NSString stringWithFormat:@"img_%02d",i + 1]];
        [self.scrollView addSubview:images];
    }
    /**
     *  设置ScrollView可以滚动的范围
     */
    self.scrollView.contentSize = CGSizeMake(totalImageWidth, 0);
    /**
     *  是否可以纵向滚动 否
     */
    self.scrollView.showsHorizontalScrollIndicator = NO;
    /**
     *  是否单页滚动
     */
    self.scrollView.pagingEnabled = YES;
    
    /**
     *  pageControl部分
     *
     */
    self.pageControl.numberOfPages = imagesCount;
    /**
     *  定时器部分
     *
     */
    [self addTimer];

}

/**
 *  添加定时器
 */
- (void)addTimer {
    self.timer = [NSTimer scheduledTimerWithTimeInterval:2.5 target:self  selector:@selector(nextPage) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];
}

/**
 *  移除定时器
 */
- (void)removeTimer {
    [self.timer invalidate];
    self.timer = nil;
}

#pragma mark - 代理方法

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGFloat imagesW = self.scrollView.bounds.size.width;
    /**
     *  判断翻页状态
     */
    int page = (int)round(self.scrollView.contentOffset.x / imagesW);
    self.pageControl.currentPage = page;
}

-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    [self removeTimer];
}

-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
    [self addTimer];
}

- (void)nextPage {
    
    int page = 0;
    if (self.pageControl.currentPage != 4) {
        page = (int)self.pageControl.currentPage + 1;
    } else {
        page = 0 ;
    }
    CGFloat imagesW = self.scrollView.bounds.size.width;
    CGFloat offsetX = imagesW * page;
    [self.scrollView setContentOffset:CGPointMake(offsetX, 0) animated:YES];
}

@end