定时器+分页

#import <UIKit/UIKit.h>

@interface XMGPageView : UIView
+ (instancetype)pageView;
/** 图片名字 */
@property (nonatomic, strong) NSArray *imageNames;
/** 其他圆点颜色 */
@property (nonatomic, strong) UIColor *otherColor;
/** 当前圆点颜色 */
@property (nonatomic, strong) UIColor *currentColor;


@end

#import "XMGPageView.h"

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

@implementation XMGPageView
/**
 * 当控件通过代码创建时，就会调用这个方法
 * 当控件通过代码创建时，想做一些初始化操作。应该在这个方法中执行
 */
- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        [self setup];
        
        // 添加子控件代码
    }
    return self;
}

/**
 * 当控件从xib\storyboard中创建完毕时，就会调用这个方法
 * 当控件从xib\storyboard中创建完毕后的初始化操作。应该在这个方法中执行
 */
- (void)awakeFromNib
{
    [self setup];
}

/**
 * 初始化代码
 */
- (void)setup
{
    self.scrollView.backgroundColor = [UIColor redColor];
}

/**
 * 当控件是通过xib\storyboard创建时，会调用这个方法来初始化控件
 */
- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super initWithCoder:aDecoder]) {
    }
    return self;
}

+ (instancetype)pageView
{
    return [[[NSBundle mainBundle] loadNibNamed:NSStringFromClass(self) owner:nil options:nil] lastObject];
}

/**
 * 当控件的尺寸发生改变的时候，会自动调用这个方法
 */
- (void)layoutSubviews
{
    [super layoutSubviews];
    
    // 设置scrollView的frame
    self.scrollView.frame = self.bounds;
    
    // 获得scrollview的尺寸
    CGFloat scrollW = self.scrollView.frame.size.width;
    CGFloat scrollH = self.scrollView.frame.size.height;
    
    // 设置pageControl
    CGFloat pageW = 100;
    CGFloat pageH = 20;
    CGFloat pageX = scrollW - pageW;
    CGFloat pageY = scrollH - pageH;
    self.pageControl.frame = CGRectMake(pageX, pageY, pageW, pageH);
    
    // 设置内容大小
    self.scrollView.contentSize = CGSizeMake(self.imageNames.count * scrollW, 0);
    
    // 设置所有imageView的frame
    for (int i = 0; i<self.scrollView.subviews.count; i++) {
        UIImageView *imageView = self.scrollView.subviews[i];
        imageView.frame = CGRectMake(i * scrollW, 0, scrollW, scrollH);
    }
}

#pragma mark - setter方法的重写
- (void)setImageNames:(NSArray *)imageNames
{
    _imageNames = imageNames;
    
    // 移除之前的所有imageView
    // 让subviews数组中的所有对象都执行removeFromSuperview方法
    [self.scrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
    
    // 根据图片名创建对应个数的imageView
    for (int i = 0; i<imageNames.count; i++) {
        UIImageView *imageView = [[UIImageView alloc] init];
        imageView.image = [UIImage imageNamed:imageNames[i]];
        [self.scrollView addSubview:imageView];
    }
    
    // 设置总页数
    self.pageControl.numberOfPages = imageNames.count;
//    if (imageNames.count <= 1) {
//        self.pageControl.hidden = YES;
//    } else {
//        self.pageControl.hidden = NO;
//    }
//    self.pageControl.hidden = imageNames.count <= 1;
//    self.pageControl.hidesForSinglePage = YES;
}

- (void)setCurrentColor:(UIColor *)currentColor
{
    _currentColor = currentColor;
    
    self.pageControl.currentPageIndicatorTintColor = currentColor;
}

- (void)setOtherColor:(UIColor *)otherColor
{
    _otherColor = otherColor;
    
    self.pageControl.pageIndicatorTintColor = otherColor;
}

#pragma mark - <UIScrollViewDelegate>
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    self.pageControl.currentPage = (int)(scrollView.contentOffset.x / scrollView.frame.size.width + 0.5);
}


#pragma mark -定时器设置

-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
   [self stopTimer];
}
-(void)stopTimer
{
    [self.timer invalidate];
    self.timer=nil;
}

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

-(void)startTimer
{
    self.timer=[NSTimer scheduledTimerWithTimeInterval:1.5 target:self selector:@selector(nextPage) userInfo:nil repeats:YES];
    [[NSRunLoop mainRunLoop]addTimer:self.timer forMode:NSRunLoopCommonModes];
}
-(void)nextPage
{
   NSInteger page=  self.pageControl.currentPage+1;
    if(page==self.pageControl.numberOfPages)
    {
        page=0;
    }
    
    
    CGPoint offset=self.scrollView.contentOffset;
    offset.x=page*self.scrollView.frame.size.width;
    
    
    [self.scrollView setContentOffset:offset animated:YES];
    NSLog(@"---------nextPage");
}



@end

    
    XMGPageView *pageView = [XMGPageView pageView];
    pageView.frame = CGRectMake(37, 50, 250, 200);
    pageView.imageNames = @[@"img_00", @"img_01", @"img_02"];
    pageView.otherColor = [UIColor grayColor];
    pageView.currentColor = [UIColor orangeColor];
    [self.view addSubview:pageView];
    self.pageView = pageView;