#import <UIKit/UIKit.h>
@class SGAdvertScrollView;

/** delegate */
@protocol SGAdvertScrollViewDelegate <NSObject>
- (void)advertScrollView:(SGAdvertScrollView *)advertScrollView didSelectedItemAtIndex:(NSInteger)index;

@end

@interface SGAdvertScrollView : UIView
/** 左边提示图片 */
@property (nonatomic, strong) UIImage *image;
/** 右边标题数组（要么是NSString，要么NSMutableAttributedString，不可混用）*/
@property (nonatomic, strong) NSArray *titleArray;
/** 设置滚动时间间隔(默认 3s) */
@property (nonatomic, assign) CGFloat timeInterval;
/** 标题字体大小(默认 12) */
@property (nonatomic, strong) UIFont *titleFont;
/** 标题字体颜色(默认 黑色) */
@property (nonatomic, strong) UIColor *titleColor;
/** titleArray 是否包含 NSMutableAttributedString 默认为NO，如果包含必须设置为 YES */
@property (nonatomic, assign) BOOL isHaveMutableAttributedString;

/** delegate_SG */
@property (nonatomic, weak) id<SGAdvertScrollViewDelegate> advertScrollViewDelegate;

@end

#import "SGAdvertScrollView.h"

@interface SGAdvertScrollViewCell : UICollectionViewCell
@property (nonatomic, strong) UILabel *tipsLabel;
@end

@implementation SGAdvertScrollViewCell

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor clearColor];

        [self.contentView addSubview:self.tipsLabel];
    }
    return self;
}
- (UILabel *)tipsLabel {
    if (!_tipsLabel) {
        _tipsLabel = [[UILabel alloc] init];
        _tipsLabel.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
        _tipsLabel.textColor = [UIColor blackColor];
        _tipsLabel.numberOfLines = 2;
        _tipsLabel.font = [UIFont systemFontOfSize:12];
    }
    return _tipsLabel;
}
@end

#pragma mark - - - SGAdvertScrollView
@interface SGAdvertScrollView () <UICollectionViewDelegate, UICollectionViewDataSource>
@property (nonatomic, strong) UIImageView *imageView;
@property (nonatomic, strong) UICollectionView *collectionView;
@property (nonatomic, strong) UICollectionViewFlowLayout *flowLayout;
@property (nonatomic, strong) NSTimer *timer;
@property (nonatomic, strong) NSArray *tempArr;
@end

@implementation SGAdvertScrollView

static NSUInteger  const SGMaxSections = 100;
static CGFloat const SGMargin = 10;

- (void)awakeFromNib {
    [super awakeFromNib];
    [self setupSubviews];
}

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        [self setupSubviews];
    }
    return self;
}

- (void)setupSubviews {
    self.backgroundColor = [UIColor whiteColor];
    [self setupLeftImageView];
    [self setupCollectionView];
    self.timeInterval = 3.0;
    self.isHaveMutableAttributedString = NO;
    // 添加定时器
    [self addTimer];
}

- (void)setupLeftImageView {
    self.imageView = [[UIImageView alloc] init];
    [self addSubview:_imageView];
}

- (void)setupCollectionView {
    self.flowLayout = [[UICollectionViewFlowLayout alloc] init];
    _flowLayout.minimumLineSpacing = 0;
    self.collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:_flowLayout];
    _collectionView.delegate = self;
    _collectionView.dataSource = self;
    _collectionView.scrollsToTop = NO;
    _collectionView.scrollEnabled = NO;
    _collectionView.pagingEnabled = YES;
    _collectionView.showsVerticalScrollIndicator = NO;
    _collectionView.backgroundColor = [UIColor clearColor];
    // 注册
    [_collectionView registerClass:[SGAdvertScrollViewCell class] forCellWithReuseIdentifier:@"tipsCell"];
    [self addSubview:_collectionView];
}

- (void)layoutSubviews {
    [super layoutSubviews];
    
    // 设置图片尺寸
    CGFloat imageViewX = SGMargin;
    CGFloat imageViewY = 0.5 * SGMargin;
    CGFloat imageViewH = self.frame.size.height - 2 * imageViewY;
    CGFloat imageViewW = imageViewH;
    _imageView.frame = CGRectMake(imageViewX, imageViewY, imageViewW, imageViewH);
    
    // 设置 collectionView 尺寸
    CGFloat collectionViewX = CGRectGetMaxX(_imageView.frame) + SGMargin;
    CGFloat collectionViewY = 0;
    CGFloat collectionViewW = self.frame.size.width - collectionViewX - SGMargin;
    CGFloat collectionViewH = self.frame.size.height;
    _collectionView.frame = CGRectMake(collectionViewX, collectionViewY, collectionViewW, collectionViewH);

    // 设置 UICollectionViewFlowLayout 尺寸
    _flowLayout.itemSize = CGSizeMake(_collectionView.frame.size.width, _collectionView.frame.size.height);
    
    // 默认显示最中间的那组
    [self defaultSelectedScetion];
}
/// 默认选中的组
- (void)defaultSelectedScetion {
    if (self.tempArr.count == 0) return; // 为解决加载数据延迟问题
    // 默认显示最中间的那组
    [self.collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:0 inSection:SGMaxSections / 2] atScrollPosition:UICollectionViewScrollPositionBottom animated:NO];
}

#pragma mark - - - UICollectionView 的 dataSource 方法
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return SGMaxSections;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return self.tempArr.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    SGAdvertScrollViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"tipsCell" forIndexPath:indexPath];
    if (self.isHaveMutableAttributedString == YES) {
        cell.tipsLabel.attributedText = self.tempArr[indexPath.item];
    } else {
        cell.tipsLabel.text = self.tempArr[indexPath.item];
    }
    if (self.titleFont != nil) {
        cell.tipsLabel.font = self.titleFont;
    }
    if (self.titleColor != nil) {
        cell.tipsLabel.textColor = self.titleColor;
    }
    return cell;
}
#pragma mark - - - UICollectionView 的 delegate 方法
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    if (self.advertScrollViewDelegate && [self.advertScrollViewDelegate respondsToSelector:@selector(advertScrollView:didSelectedItemAtIndex:)]) {
        [self.advertScrollViewDelegate advertScrollView:self didSelectedItemAtIndex:indexPath.item];
    }
}

#pragma mark - - - 创建定时器
- (void)addTimer {
    [self removeTimer];
    self.timer = [NSTimer scheduledTimerWithTimeInterval:self.timeInterval target:self selector:@selector(beginUpdateUI) userInfo:nil repeats:YES];
    [[NSRunLoop mainRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
}
#pragma mark - - - 移除定时器
- (void)removeTimer {
    [_timer invalidate];
    _timer = nil;
}
#pragma mark - - - 定时器执行方法 - 更新UI
- (void)beginUpdateUI {
    if (self.tempArr.count == 0) return; // 为解决加载网络图片延迟问题

    // 1、当前正在展示的位置
    NSIndexPath *currentIndexPath = [[self.collectionView indexPathsForVisibleItems] lastObject];
    //SGDebugLog(@"currentIndexPath - - %@", currentIndexPath);
    // 马上显示回最中间那组的数据
    NSIndexPath *resetCurrentIndexPath = [NSIndexPath indexPathForItem:currentIndexPath.item inSection:SGMaxSections / 2];
    //SGDebugLog(@"section - - %ld; item - - %ld", resetCurrentIndexPath.section, resetCurrentIndexPath.item);
    [self.collectionView scrollToItemAtIndexPath:resetCurrentIndexPath atScrollPosition:UICollectionViewScrollPositionBottom animated:NO];

    // 2、计算出下一个需要展示的位置
    NSInteger nextItem = resetCurrentIndexPath.item + 1;
    NSInteger nextSection = resetCurrentIndexPath.section;
    if (nextItem == self.tempArr.count) {
        nextItem = 0;
        nextSection++;
    }

    NSIndexPath *nextIndexPath = [NSIndexPath indexPathForItem:nextItem inSection:nextSection];
    // 3、通过动画滚动到下一个位置
    [self.collectionView scrollToItemAtIndexPath:nextIndexPath atScrollPosition:UICollectionViewScrollPositionBottom animated:YES];
}

#pragma mark - - - setting
- (void)setImage:(UIImage *)image {
    _image = image;
    _imageView.image = image;
}

- (void)setTitleArray:(NSArray *)titleArray {
    _titleArray = titleArray;
    self.tempArr = [NSArray arrayWithArray:titleArray];
}

- (void)setTimeInterval:(CGFloat)timeInterval {
    _timeInterval = timeInterval;
    [self addTimer];
}


@end

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface SGHelperTool : NSObject

/** 简单的图文混排 */
+ (NSMutableAttributedString *)SG_textAttachmentWithImageName:(NSString *)imageName imageSize:(CGSize)imageSize frontText:(NSString *)frontText behindText:(NSString *)behindText;

@end

#import "SGHelperTool.h"

@implementation SGHelperTool

/**
 *  简单的图文混排
 *
 *  @param imageName   图片名
 *  @param imageSize   图片大小
 *  @param frontText   图片前面内容
 *  @param behindText   图片后面内容
 *
 *  @return attributedText
 */
+ (NSMutableAttributedString *)SG_textAttachmentWithImageName:(NSString *)imageName imageSize:(CGSize)imageSize frontText:(NSString *)frontText behindText:(NSString *)behindText {
    NSTextAttachment *imageText = [[NSTextAttachment alloc] init];
    imageText.image = [UIImage imageNamed:imageName];
    // 将 NSTextAttachment 转换成 NSAttributedString 属性
    NSAttributedString *imageText_AttributedStr = [NSAttributedString attributedStringWithAttachment:imageText];
    // 将 NSAttributedString 属性 转换成 NSMutableAttributedString
    NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithAttributedString:imageText_AttributedStr];
    
    // imageText 前面的文字转换成 NSMutableAttributedString
    NSMutableAttributedString *front_mAttribStr = [[NSMutableAttributedString alloc] initWithString:frontText];
    // 将文字插在图片前面
    [attributedText insertAttributedString:front_mAttribStr atIndex:0];
    
    NSMutableAttributedString *behind_mAttribStr = [[NSMutableAttributedString alloc] initWithString:behindText];
    [behind_mAttribStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, behindText.length)];
    // 将文字插在图片后面
    [attributedText appendAttributedString:behind_mAttribStr];
    
    // 设置图片的大小
    imageText.bounds = CGRectMake(0, - 5, imageSize.width, imageSize.height);

    // 调整行间距
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:5];
    [attributedText addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, attributedText.length)];
    
    return attributedText;
}

@end

#import "ViewController.h"
#import "SGAdvertScrollView.h"
#import "SGHelperTool.h"
#import "DetailViewController.h"

@interface ViewController () <SGAdvertScrollViewDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    // 例一
    SGAdvertScrollView *advertScrollView = [[SGAdvertScrollView alloc] init];
    advertScrollView.frame = CGRectMake(0, 150, self.view.frame.size.width, 30);
    advertScrollView.titleColor = [[UIColor blackColor] colorWithAlphaComponent:0.5];
    advertScrollView.image = [UIImage imageNamed:@"horn_icon"];
    advertScrollView.titleArray = @[@"常见电商类 app 滚动播放广告信息", @"采用代理模式封装, 可进行事件点击处理", @"建议去 github 上下载"];
    advertScrollView.titleFont = [UIFont systemFontOfSize:14];
    advertScrollView.advertScrollViewDelegate = self;
    [self.view addSubview:advertScrollView];
    
    
    // 例二
    SGAdvertScrollView *advertScrollView2 = [[SGAdvertScrollView alloc] init];
    advertScrollView2.frame = CGRectMake(0, 250, self.view.frame.size.width, 44);
    advertScrollView2.image = [UIImage imageNamed:@"Tmall_rendian"];
    NSMutableAttributedString *attributedText1 = [SGHelperTool SG_textAttachmentWithImageName:@"hot" imageSize:(CGSizeMake(36, 19)) frontText:@"聚惠女王节，香米更低价满150减10\n" behindText:@"满150减10+满79减5"];
    NSMutableAttributedString *attributedText2 = [SGHelperTool SG_textAttachmentWithImageName:@"" imageSize:(CGSizeMake(0, 0)) frontText:@"HTC新品首发，预约送大礼包\n" behindText:@"12期免息＋免费试用"];
    NSMutableAttributedString *attributedText3 = [SGHelperTool SG_textAttachmentWithImageName:@"activity" imageSize:(CGSizeMake(36, 19)) frontText:@"“挑食”进口生鲜，满199减20\n" behindText:@"领券满199减20+进口直达"];
    advertScrollView2.isHaveMutableAttributedString = YES;
    advertScrollView2.titleArray = @[attributedText1, attributedText2, attributedText3];
    [self.view addSubview:advertScrollView2];
}

/// 代理方法(点击进行跳转)
- (void)advertScrollView:(SGAdvertScrollView *)advertScrollView didSelectedItemAtIndex:(NSInteger)index {
    
    NSLog(@"点击的是 = %ld", (long)index);
    
    
    DetailViewController *nextVC = [[DetailViewController alloc] init];
    [self.navigationController pushViewController:nextVC animated:YES];
}


@end