RoateView

#import <UIKit/UIKit.h>

typedef void(^Click)(NSInteger index);

@interface SLRoateView : UIView
/*
 // tableView 中cell的复用机制始终没整出来 所以现在只能放image 放tableview没有意义 因为怎么都要创建数组这么多个tableview
{
// 当scrollView装载的别的View 而不是imageView 比如一些App中scrollVeiw上放的的tableView 等等用以分类展示的view 像爱奇艺首页的电影、电视、综艺、动漫 这样就不允许有轮播和点击属性

// 是否允许轮播 默认允许 NO
@property(nonatomic, assign)BOOL AllowCarousel;

// 是否支持点击 只需判断block 是否为空 为空则不添加手势
@property(nonatomic, assign)BOOL SupportInteraction;
}
*/
// 创建
+ (SLRoateView *)roateViewWithFrame:(CGRect)frame array:(NSArray *)array click:(Click)click;

//- (instancetype)initWithFrame:(CGRect)frame array:(NSArray *)array click:(Click)click;

@end

#import "SLRoateView.h"

@interface SLRoateView ()<UIScrollViewDelegate>
@property(nonatomic, strong)NSArray *array;
@property(nonatomic, copy)Click click;
@property(nonatomic, assign)CGFloat KRoateWidth;
@property(nonatomic, assign)CGFloat KRoateHeight;
@property(nonatomic, strong)UIImageView *leftImageView;
@property(nonatomic, strong)UIImageView *centerImageView;
@property(nonatomic, strong)UIImageView *rightImageView;
@property(nonatomic, assign)NSInteger index;
@property(nonatomic, strong)UIPageControl *pageControl;
@property(nonatomic, strong)NSTimer *timer;
@property(nonatomic, strong)UIScrollView *scroll;
@end

@implementation SLRoateView

+ (SLRoateView *)roateViewWithFrame:(CGRect)frame array:(NSArray *)array click:(Click)click
{
    SLRoateView *roateView = [[SLRoateView alloc]initWithFrame:frame array:array click:click];
    return roateView;
}

- (instancetype)initWithFrame:(CGRect)frame array:(NSArray *)array click:(Click)click
{
    self = [super initWithFrame:frame];
    if (self) {
        self.KRoateWidth = frame.size.width;
        self.KRoateHeight = frame.size.height;
        self.array = array;
        self.click = click;
        // scrollVeiw 设置
        self.scroll = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, _KRoateWidth, _KRoateHeight)];
        self.scroll.contentSize = CGSizeMake(_KRoateWidth * 3, 0);
        self.scroll.pagingEnabled = YES;
        self.scroll.contentOffset = CGPointMake(_KRoateWidth, 0);
        self.scroll.alwaysBounceVertical = NO;
        self.scroll.showsVerticalScrollIndicator = NO;
        self.scroll.alwaysBounceHorizontal = YES;
        self.scroll.showsHorizontalScrollIndicator = NO;
        self.scroll.delegate = self;
        [self addSubview:_scroll];
        
        [self addGestureRecognizer];
        [self addImageViews];
        [self setDefautImage];
        [self addPageControl];
        
        [self addTimer];
    }
    return self;
}

#pragma mark 添加计时器
- (void)addTimer
{
    // 在子线程中创建一个计时器 是图片实现轮播
    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        _timer = [NSTimer timerWithTimeInterval:3 target:self selector:@selector(rotaView) userInfo:nil repeats:YES];
        [[NSRunLoop currentRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
        
        [[NSRunLoop currentRunLoop] run];
        
    });
}

- (void)rotaView
{
    [_scroll setContentOffset:CGPointMake(_KRoateWidth * 2, 0) animated:YES];
    NSLog(@"%ld", _index);
    // 设置分页 由于动画是从中间移动到第三张 所以pageControl要显示的不是中间图片而是第三张图片
    _pageControl.currentPage = (_index + 1) % _array.count;
    if (_scroll.contentOffset.x/_KRoateWidth == 2)
    {
        [self reloadImage];
        // scrollView 回到中间
        [self.scroll setContentOffset:CGPointMake(_KRoateWidth, 0) animated:NO];
    }
}

#pragma mark 添加点击事件
- (void)addGestureRecognizer
{
    [self addGestureRecognizer:[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapGestureRecognizer)]];
}

- (void)tapGestureRecognizer
{
    if (_click)
    {
        // 用当前的
        self.click(_pageControl.currentPage);
    }
    
}
#pragma mark 添加图片控件
- (void)addImageViews
{
    _leftImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, _KRoateWidth, _KRoateHeight)];
    // imageView 大小不会改变 UIViewContentModeScaleAspectFit 只是image大小变化了
//    _leftImageView.contentMode = UIViewContentModeScaleAspectFit;
    [self.scroll addSubview:_leftImageView];
    
    _centerImageView = [[UIImageView alloc]initWithFrame:CGRectMake(_KRoateWidth, 0, _KRoateWidth, _KRoateHeight)];
//    _centerImageView.contentMode = UIViewContentModeScaleAspectFit;
    [self.scroll addSubview:_centerImageView];

    _rightImageView = [[UIImageView alloc]initWithFrame:CGRectMake(_KRoateWidth * 2, 0, _KRoateWidth, _KRoateHeight)];
//    _rightImageView.contentMode = UIViewContentModeScaleAspectFit;
    [self.scroll addSubview:_rightImageView];
    NSLog(@" %f %f %f", _leftImageView.frame.size.height, _centerImageView.frame.size.height, _rightImageView.frame.size.height);
}

#pragma mark 设置默认显示图片
- (void)setDefautImage
{
    _leftImageView.image = _array[_array.count - 1];
    _centerImageView.image = _array[0];
    _rightImageView.image = _array[1];
    _index = 0;
    _pageControl.currentPage = _index;
}

#pragma mark 添加分页控件
- (void)addPageControl
{
    
    // 根据页数放回UIPageControl合适的大小 返回（0，0）不知道为啥 ----先要创建出来再给frame
    _pageControl = [[UIPageControl alloc]init];
    CGSize size = [_pageControl sizeForNumberOfPages:_array.count];
    _pageControl.frame = CGRectMake(0, 0, size.width, size.height);
    _pageControl.center = CGPointMake(_KRoateWidth / 2, _KRoateHeight - size.height/2);
    _pageControl.numberOfPages = _array.count;
    [self addSubview:_pageControl];
}

//#pragma mark 拖拽事件
//- (void)scrollViewDidScroll:(UIScrollView *)scrollView
//{
//    if (scrollView.isDragging)
//    {
//        NSLog(@"关闭定时器");
//        [_timer setFireDate:[NSDate distantFuture]];
//    }
//    if (!scrollView.isDragging)
//    {
//        NSLog(@"asdfasdf");
//    }
//}

#pragma mark 滚动停止事件
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    // 5秒后启动计时器
    [_timer performSelector:@selector(setFireDate:) withObject:[NSDate distantPast] afterDelay:5];
    [self reloadImage];
    // scrollView 回到中间
    [self.scroll setContentOffset:CGPointMake(_KRoateWidth, 0) animated:NO];
    
    // 设置分页
    _pageControl.currentPage = _index;
    
}

#pragma mark 重新加载图片
- (void)reloadImage
{
    NSInteger leftIndex, rigtIndex;
    CGPoint offset = self.scroll.contentOffset;
    if (offset.x > _KRoateWidth)
    {
        _index = (_index + 1) % _array.count;
    }else if (offset.x < _KRoateWidth)
    {
        _index = (_index + _array.count - 1) % _array.count;
    }
    _centerImageView.image = _array[_index];
    
    leftIndex = (_index + _array.count - 1) % _array.count;
    rigtIndex = (_index + 1) % _array.count;
    _leftImageView.image = _array[leftIndex];
    _rightImageView.image = _array[rigtIndex];
}

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    if (scrollView.isDragging)
    {
        // 取消timer之前的执行请求
        [NSObject cancelPreviousPerformRequestsWithTarget:_timer];
        // 关闭定时器
        [_timer setFireDate:[NSDate distantFuture]];
        
    }
}