IOS UIScrollView实现自动轮播图功能

////  LoopScrollImageView.h//  test07 实现自动轮播图效果////  Created by mouweng on 17/8/26.//  Copyright © 2017年 mouweng. All rights reserved.//#import <UIKit/UIKit.h>@interface LoopScrollImageView : UIView <UIScrollViewDelegate>    @property (nonatomic, retain) NSTimer * timer;  //设置定时器        @property (nonatomic, retain) UIScrollView * scrollView;    @property (nonatomic, retain) UIPageControl * pageControl;    @property (nonatomic, retain) UILabel * currentPageLabel;        @property (nonatomic, retain) NSArray * dataSource;            - (id) initWithFrame:(CGRect)frame images:(NSArray *)images;        - (void) startTimer;    - (void) stopTimer;@end

////  LoopScrollImageView.m//  test07 实现自动轮播图效果////  Created by mouweng on 17/8/26.//  Copyright © 2017年 mouweng. All rights reserved.//#import "LoopScrollImageView.h"@implementation LoopScrollImageView//重写初始化方法- (id) initWithFrame:(CGRect)frame images:(NSArray *)images {    if (self = [super initWithFrame:frame]) {        self.dataSource = images;        // 1. 初始化定时器        _timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(loopImageTimer:) userInfo:nil repeats:YES];        //[timer setFireDate:[NSDate distantFuture]];                CGFloat viewWidth = CGRectGetWidth(self.frame);        CGFloat viewHeigh = CGRectGetHeight(self.frame);        NSUInteger pageCount = images.count;                // 2. 初始化UIScrollView        _scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, viewWidth, viewHeigh)];        _scrollView.contentSize = CGSizeMake(viewWidth * pageCount, viewHeigh);        _scrollView.showsVerticalScrollIndicator = NO;        _scrollView.showsHorizontalScrollIndicator = NO;        _scrollView.pagingEnabled = YES;        _scrollView.delegate = self;                for (int i = 0; i < images.count; i++) {            UIImageView * imageView = [[UIImageView alloc] initWithFrame:CGRectMake(viewWidth * i, 0, viewWidth, viewHeigh)];            imageView.contentMode = UIViewContentModeScaleAspectFill;            imageView.image = [UIImage imageNamed:images[i]];            imageView.tag = i;            imageView.userInteractionEnabled = YES;            UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(loopImageOnClicked:)];            [imageView addGestureRecognizer:tap];                        [_scrollView addSubview:imageView];        }                [self addSubview:_scrollView];                if (images.count > 1) {            // 3. 初始化UIPageControl            int pageControllHeight = 30;            CGFloat scrollViewBottom = _scrollView.frame.origin.y + _scrollView.frame.size.height;            _pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(10, scrollViewBottom - pageControllHeight, 100, pageControllHeight)];            _pageControl.currentPage = 0;//当前页数所在的page位置            _pageControl.numberOfPages = pageCount;            _pageControl.backgroundColor = [UIColor grayColor];            [self addSubview:_pageControl];                        // 4. 初始化 当前页/总页数            _currentPageLabel = [[UILabel alloc] initWithFrame:CGRectMake(viewWidth - 50, _pageControl.frame.origin.y, 50, pageControllHeight)];            _currentPageLabel.text = [NSString stringWithFormat:@"%d/%ld", 1, images.count];            [self addSubview:_currentPageLabel];        }    }        return self;}- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {    if ([scrollView isMemberOfClass:[UITableView class]]) {            }else {        int index = fabs(scrollView.contentOffset.x) / scrollView.frame.size.width;   //当前是第几个视图        _pageControl.currentPage = index;                _currentPageLabel.text = [NSString stringWithFormat:@"%d/%ld", index + 1, self.dataSource.count];    }}//循环定时器设置#pragma mark - Actions- (void) loopImageTimer:(NSTimer *)timer {    NSUInteger totalNum = self.dataSource.count;    if (totalNum > 1) {        CGPoint newOffset = _scrollView.contentOffset;        newOffset.x = newOffset.x + CGRectGetWidth(_scrollView.frame);        if (newOffset.x > (CGRectGetWidth(_scrollView.frame) * (totalNum-1))) {            newOffset.x = 0 ;        }        int index = newOffset.x / CGRectGetWidth(_scrollView.frame);   //当前是第几个视图        newOffset.x = index * CGRectGetWidth(_scrollView.frame);                _pageControl.currentPage = index;        _currentPageLabel.text = [NSString stringWithFormat:@"%d / %ld",index+1, totalNum];        [_scrollView setContentOffset:newOffset animated:YES];    }else{        [_timer setFireDate:[NSDate distantFuture]];//关闭定时器    }}//点击事件- (void) loopImageOnClicked:(UITapGestureRecognizer *) tapGestureRecognizer{    NSInteger imageViewTag = tapGestureRecognizer.view.tag;    NSLog(@"imageViewTag: ----------------- %ld", imageViewTag);        // 0, 1, 2    }//开始和停止#pragma mark - Methods- (void) startTimer {    [_timer setFireDate:[NSDate distantPast]];}- (void) stopTimer {    [_timer setFireDate:[NSDate distantFuture]];}@end

////  ViewController.m//  test07 实现自动轮播图效果////  Created by mouweng on 17/8/26.//  Copyright © 2017年 mouweng. All rights reserved.//#import "ViewController.h"#import "LoopScrollImageView.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.title = @"UIImage自动轮播";        NSArray *  imageDataSource = [NSArray arrayWithObjects:@"1.jpg", @"2.jpg", @"3.jpg", nil];    // 只需初始化就可以实现效果    LoopScrollImageView * loopScrollImageView =[[LoopScrollImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 736) images:imageDataSource];    [self.view addSubview:loopScrollImageView];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end