#import "ViewController.h"
#import "SHowCell.h"

@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>
@property (nonatomic,strong)UITableView *tableView;
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    [self.view addSubview:self.tableView];
}
- (UITableView *)tableView{
    if (!_tableView) {
        _tableView = [[UITableView alloc]initWithFrame:self.view.frame style:(UITableViewStylePlain)];
        _tableView.dataSource = self;
        _tableView.delegate = self;
    }
    return _tableView;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return 11;
}


- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return 200;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    //第6个Cell显示为图片
    if (indexPath.row != 5) {
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
        if (!cell) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
        }
        cell.backgroundColor = [UIColor redColor];
        cell.textLabel.text = @"这是一条新闻内容";
        return cell;
        
    } else {
        SHowCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell1"];
        if (!cell) {
            cell = [[SHowCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell1"];
           }
        return cell;
    }
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    //开始显示图片时的偏移量
    CGFloat contentPointY = 5 * 200 - [UIScreen mainScreen].bounds.size.height;
    //scrollView的偏移量
    CGFloat contentOffSet = scrollView.contentOffset.y;
    //图片开始显示和结束显示的偏移量判断
    if (contentOffSet >= contentPointY && contentOffSet <= 4 * 200) {
        NSIndexPath *indexs = [NSIndexPath indexPathForRow:5 inSection:0];
        SHowCell *showcell = [self.tableView cellForRowAtIndexPath:indexs];
        showcell.contendOffset = contentOffSet - contentPointY;
    }
    
}

@interface SHowCell : UITableViewCell
@property (nonatomic,assign) CGFloat contendOffset;
@end

#import "SHowCell.h"
@interface SHowCell ()
@property (nonatomic,strong) UIScrollView *scrollView;
@property (nonatomic,strong) UIImageView *myimageView;
@end

@implementation SHowCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        self.scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 200)];
        self.scrollView.contentSize = CGSizeMake([UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height);
        self.scrollView.alwaysBounceVertical = YES;
        [self.contentView addSubview:self.scrollView];
        self.scrollView.userInteractionEnabled = NO;
        
        self.myimageView = [[UIImageView alloc]initWithFrame:(CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 200))];
        self.myimageView.image = [UIImage imageNamed:@"这是一张广告图片"];
        CGFloat height = self.myimageView.image.size.height;
        //- height + cellHeight 从图片的底部开始加载 根据图片的高度进行加载
        self.myimageView.frame = CGRectMake(0, - height + 200, [UIScreen mainScreen].bounds.size.width, height);
        [self.scrollView addSubview:self.myimageView];
    }
    return self;
}

- (void)setContendOffset:(CGFloat)contendOffset{
    _contendOffset = contendOffset;
    [self.scrollView setContentOffset:CGPointMake(0, -_contendOffset) animated:NO];
}