cell视觉差(一)

#import "ViewController.h"
#import "ShowCell.h"
#import "TittleCell.h"

#define kWidth [UIScreen mainScreen].bounds.size.width
#define kHeight [UIScreen mainScreen].bounds.size.height
#define cellHeight 200

@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>

@property (nonatomic,strong) UITableView *tableView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    self.navigationController.navigationBar.translucent = NO;
    [self.view addSubview:self.tableView];
}

- (UITableView *)tableView {
    if (!_tableView) {
        _tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
        _tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
        _tableView.delegate = self;
        _tableView.dataSource = self;
        _tableView.estimatedRowHeight = 0.0;
        _tableView.sectionHeaderHeight = 0.0;
        _tableView.sectionFooterHeight = 0.0;
        _tableView.estimatedSectionHeaderHeight = 0.0;
        _tableView.estimatedSectionFooterHeight = 0.0;
        _tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
        [_tableView registerNib:[UINib nibWithNibName:NSStringFromClass([TittleCell class]) bundle:[NSBundle mainBundle]] forCellReuseIdentifier:NSStringFromClass([TittleCell class])];
        [_tableView registerClass:[ShowCell class] forCellReuseIdentifier:NSStringFromClass([ShowCell class])];
    }
    return _tableView;
}

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

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    //第6个Cell显示为图片
    if (indexPath.row != 5) {
        TittleCell *cell = [tableView dequeueReusableCellWithIdentifier:NSStringFromClass([TittleCell class]) forIndexPath:indexPath];
        return cell;
    } else {
        ShowCell *cell = [tableView dequeueReusableCellWithIdentifier:NSStringFromClass([ShowCell class]) forIndexPath:indexPath];
        return cell;
    }
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    //开始显示图片时的偏移量
    CGFloat contentPointY = 5 * cellHeight - kHeight;
    CGFloat contentOffSet = scrollView.contentOffset.y;
    
    NSLog(@"垂直方向偏移量：%f，临界Y值：%f",scrollView.contentOffset.y,contentPointY);
    
    if (contentOffSet >= contentPointY && contentOffSet <= 5 * cellHeight) {
        NSIndexPath *indexs = [NSIndexPath indexPathForRow:5 inSection:0];
        ShowCell *showcell = [self.tableView cellForRowAtIndexPath:indexs];
        showcell.contendOffset = contentOffSet - contentPointY;
    }
}

@end