TableView上下滑动 （仿->短视频,直播 ）

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.h 

// 一张一张 滑动

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface XTableViewVC : UIViewController

@end

NS_ASSUME_NONNULL_END

.m

// 一张一张 滑动

#import "XTableViewVC.h"

#define X_SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define X_SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height
#define X_STATUS_BAR_HEIGHT [UIApplication sharedApplication].statusBarFrame.size.height

static NSUInteger kDataSourceCount = 20;

@interface XTableViewVC () <UITableViewDelegate, UITableViewDataSource>

@property (nonatomic, strong) UITableView *tableView;
@property (nonatomic, assign) NSInteger    currentIndex;

@end

@implementation XTableViewVC

#pragma mark -
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    
    self.navigationController.navigationBarHidden = YES;
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    
    self.navigationController.navigationBarHidden = NO;
}

#pragma mark -
- (void)dealloc {
    [self.tableView.layer removeAllAnimations];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [self removeObserver:self forKeyPath:@"currentIndex"];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    // 释放 播放view
    
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    [self setBackgroundImage:@"图片1"]; // 占位
    [self setUpView];
    
}

#pragma mark -
- (void)setBackgroundImage:(NSString *)imageName {
    UIImageView *background = [[UIImageView alloc] initWithFrame:self.view.bounds];
    background.clipsToBounds = YES;
    background.contentMode = UIViewContentModeScaleAspectFill;
    background.image = [UIImage imageNamed:imageName];
    [self.view addSubview:background];
}
 
#pragma mark -
- (instancetype)init {
    self = [super init];
    if (self) {
        self.currentIndex = 0;
        
        // 电池条 点击
        /*
         方法二 ： 不可以点击
         // 取消 tableview 点击状态栏 自动回弹到顶部
         _tableView.scrollsToTop = NO;
         
         */
        /*
         方法一 ： 可以点击
         AppDelegate 中 加入这个
         
         - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
             [super touchesBegan:touches withEvent:event];
             
             //当触摸状态栏的时候发送触摸通知 这样控制器就收到了点击事件
             CGPoint touchLocation = [[[event allTouches] anyObject] locationInView:self.window];
             CGRect statusBarFrame = [UIApplication sharedApplication].statusBarFrame;
             if (CGRectContainsPoint(statusBarFrame, touchLocation)) {
                 [[NSNotificationCenter defaultCenter] postNotificationName:StatusBarTouchBeginNotification object:nil];
             }
         }
         */
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(statusBarTouchBegin) name:StatusBarTouchBeginNotification object:nil];
        /*
         （4）回调方法：applicationDidEnterBackground:
         本地通知：UIApplicationDidEnterBackgroundNotification
         触发时机：程序进入后台时调用。
         适宜操作：这个阶段应该保存用户数据，释放一些资源（例如释放数据库资源）。
         （5）回调方法：applicationWillEnterForeground：
         本地通知：UIApplicationWillEnterForegroundNotification
         触发时机：程序进入前台，但是还没有处于活动状态时调用。
         适宜操作：这个阶段应该恢复用户数据。
         */
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationBecomeActive) name:UIApplicationWillEnterForegroundNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationEnterBackground) name: UIApplicationDidEnterBackgroundNotification object:nil];
    }
    return self;
}

#pragma mark -
#pragma mark - event response 所有触发的事件响应 按钮、通知、分段控件等
- (void)statusBarTouchBegin {
    self.currentIndex = 0; //KVO
}

- (void)applicationBecomeActive {
//    UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:self.currentIndex inSection:0]];
//    if(!_isCurPlayerPause) {
//        [cell.playerView play];
//    }
}

- (void)applicationEnterBackground {
//    UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:_currentIndex inSection:0]];
//    _isCurPlayerPause = ![cell.playerView rate];
//    [cell.playerView pause];
}
//观察currentIndex变化
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {
    if ([keyPath isEqualToString:@"currentIndex"]) {
        //获取当前显示的cell
//        UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:_currentIndex inSection:0]];
//        __weak typeof (cell) wcell = cell;
//        __weak typeof (self) wself = self;
        //用cell控制相关视频播放
        
    } else {
        return [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}


#pragma mark -
#pragma mark - private methods 私有方法
- (void)setUpView
{
    _tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, -X_SCREEN_HEIGHT, X_SCREEN_WIDTH, X_SCREEN_HEIGHT * 5)];
    _tableView.contentInset = UIEdgeInsetsMake(X_SCREEN_HEIGHT, 0, X_SCREEN_HEIGHT * 3, 0);
    
    _tableView.backgroundColor = [UIColor clearColor];
    _tableView.delegate = self;
    _tableView.dataSource = self;
    _tableView.showsVerticalScrollIndicator = NO;
    _tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
    if (@available(iOS 11.0, *)) {
        _tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    } else {
        self.automaticallyAdjustsScrollViewInsets = NO;
    }
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [self.view addSubview:self.tableView];
        [self.tableView reloadData];
        
        if (kDataSourceCount != 0)
        {
            NSIndexPath *curIndexPath = [NSIndexPath indexPathForRow:self.currentIndex inSection:0];
            [self.tableView scrollToRowAtIndexPath:curIndexPath atScrollPosition:UITableViewScrollPositionMiddle animated:NO];
            [self addObserver:self forKeyPath:@"currentIndex" options:NSKeyValueObservingOptionInitial|NSKeyValueObservingOptionNew context:nil];
        }
    });
}

#pragma mark -
#pragma mark ----- UITableViewDelegate
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return kDataSourceCount;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return self.view.frame.size.height;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    UITableViewCell *currentCell = [tableView dequeueReusableCellWithIdentifier:@"TeamListCell"];
    if (!currentCell) {
        currentCell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"TeamListCell"];
    }
    currentCell.textLabel.text = [NSString stringWithFormat:@"%@  %ld", @"这个是：", indexPath.row];
    currentCell.textLabel.textColor = [UIColor whiteColor];
    currentCell.contentView.backgroundColor = [UIColor colorWithHexString:@"#131428" alpha:1.];
    currentCell.backgroundColor = [UIColor xpf_randomColor];
    currentCell.contentView.backgroundColor = [UIColor xpf_randomColor];
    return currentCell;
}


#pragma mark -
#pragma mark - ScrollView delegate
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    if (kDataSourceCount != 0)
    {
        dispatch_async(dispatch_get_main_queue(), ^{
            CGPoint translatedPoint = [scrollView.panGestureRecognizer translationInView:scrollView];
            //UITableView禁止响应其他滑动手势
            scrollView.panGestureRecognizer.enabled = NO;
            
            if(translatedPoint.y < -50 && self.currentIndex < (kDataSourceCount - 1)) {
                self.currentIndex ++;   //向下滑动索引递增
            }
            if(translatedPoint.y > 50 && self.currentIndex > 0) {
                self.currentIndex --;   //向上滑动索引递减
            }
            [UIView animateWithDuration:0.15 delay:0.0 options:UIViewAnimationOptionCurveEaseOut animations:^{
                //UITableView滑动到指定cell
                [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:self.currentIndex inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:NO];
            } completion:^(BOOL finished) {
                // UITableView可以响应其他滑动手势
                scrollView.panGestureRecognizer.enabled = YES;
            }];
            
        });
    }
    
}

#pragma mark -
#pragma mark -






@end