实现collectionview加载到tableview的tableFooterView上一起滑动(类似淘宝购物车)--通过添加观察者实现

- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.title = @"交易成功";    self.view.backgroundColor = [UIColor whiteColor];        self.navigationItem.leftBarButtonItem = [BackButtonItem getBackItemWithTitle:@""  image:[UIImage imageNamed:@"fl_fanhui-jian"] target:self action:@selector(goBackPage:)];        //右侧确认按钮    self.rightBtn = [UIButton buttonWithType:UIButtonTypeCustom];    self.rightBtn.userInteractionEnabled = YES;    [self.rightBtn setImage:[UIImage imageNamed:@"gengduoanniu"] forState:UIControlStateNormal];    self.rightBtn.titleLabel.font = MIDDLE_LIT_FONT;    [self.rightBtn setTitleColor:THEME_GREEN_COLOR forState:UIControlStateNormal];    [self.rightBtn addTarget:self action:@selector(clickedRightBtn:) forControlEvents:UIControlEventTouchUpInside];    self.rightBtn.frame = CGRectMake(0, 0, 40, 30) ;        self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:self.rightBtn];            [self drawMainViewPage];}-(void)viewWillAppear:(BOOL)animated{    [super viewWillAppear:animated];    self.navigationController.navigationBar.translucent = YES;    [self.myColView reloadData];}-(void)viewWillDisappear:(BOOL)animated{    [super viewWillDisappear:animated];}-(void)drawMainViewPage{    self.myTableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_WIDTH) style:UITableViewStylePlain];    [self.view addSubview:self.myTableView];    [self.myTableView mas_remakeConstraints:^(MASConstraintMaker *make) {        make.top.mas_equalTo(self.view.mas_top);        make.left.right.bottom.mas_equalTo(self.view);    }];    self.myTableView.backgroundColor = BKG_HEX_GRAY_EEE;    [self.myTableView layoutIfNeeded];    self.myTableView.delegate = self;    self.myTableView.dataSource = self;    self.myTableView.estimatedRowHeight = 49;    self.myTableView.rowHeight = UITableViewAutomaticDimension;    [self.myTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];    self.myTableView.separatorStyle = UITableViewCellSeparatorStyleNone;    //    [self drawHeaderView];    [self drawFooterCol];}-(void)drawHeaderView{    self.headerView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH,190)];    self.myTableView.tableHeaderView = self.headerView;    self.headerView.backgroundColor = [UIColor whiteColor];    //上    self.headerImgv = [[UIImageView alloc]init];    self.headerImgv.backgroundColor = [UIColor whiteColor];    self.headerImgv.image = [UIImage imageNamed:@"jiaoyiwanchengtupian"];    [self.headerView addSubview:self.headerImgv];    [self.headerImgv mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.mas_equalTo(self.headerView.mas_top);        make.left.right.mas_equalTo(self.headerView);        make.height.mas_equalTo(SCREEN_WIDTH*(124/375.0));    }];    [self.headerImgv layoutIfNeeded];        CGFloat widht_btn = (SCREEN_WIDTH-40*2- 18)/2.0;        self.liJiPJBtn = [UIButton buttonWithType:UIButtonTypeCustom];    [self.headerView addSubview:self.liJiPJBtn];    self.liJiPJBtn.layer.borderColor = TEXT_HEX_MID_GRAY.CGColor;    self.liJiPJBtn.layer.borderWidth = 1;    self.liJiPJBtn.layer.cornerRadius = 20/2.0;    self.liJiPJBtn.titleLabel.font = BIG_B_FONT;    [self.liJiPJBtn setTitle:@"立即评价" forState:UIControlStateNormal];    [self.liJiPJBtn setTitleColor:TEXT_HEX_LIGHT_L_GRAY forState:UIControlStateNormal];    [self.liJiPJBtn addTarget:self action:@selector(clickedLiJIPIngJiaBtn:) forControlEvents:UIControlEventTouchUpInside];    [self.liJiPJBtn mas_makeConstraints:^(MASConstraintMaker *make) {        make.left.mas_equalTo(self.headerView.mas_left).mas_offset(40);        make.top.mas_equalTo(self.headerImgv.mas_bottom).mas_offset(22);        make.size.mas_equalTo(CGSizeMake(widht_btn, 40));    }];        self.dingDxqBtn = [UIButton buttonWithType:UIButtonTypeCustom];    [self.headerView addSubview:self.dingDxqBtn];    self.dingDxqBtn.layer.borderColor = TEXT_HEX_MID_GRAY.CGColor;    self.dingDxqBtn.layer.borderWidth = 1;    self.dingDxqBtn.layer.cornerRadius = 20/2.0;    self.dingDxqBtn.titleLabel.font = BIG_B_FONT;    [self.dingDxqBtn setTitle:@"订单详情" forState:UIControlStateNormal];    [self.dingDxqBtn setTitleColor:TEXT_HEX_LIGHT_L_GRAY forState:UIControlStateNormal];    [self.dingDxqBtn addTarget:self action:@selector(clickedDingDanXiangQingaBtn:) forControlEvents:UIControlEventTouchUpInside];    [self.dingDxqBtn mas_makeConstraints:^(MASConstraintMaker *make) {        make.left.mas_equalTo(self.liJiPJBtn.mas_right).mas_offset(18);        make.top.mas_equalTo(self.headerImgv.mas_bottom).mas_offset(22);        make.size.mas_equalTo(CGSizeMake(widht_btn, 40));    }];        self.headerView.frame = CGRectMake(0, 0, SCREEN_WIDTH,self.headerImgv.frame.size.height+22+40+22);}-(void)drawFooterCol{    self.footView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, 90)];    self.myTableView.tableFooterView = self.footView;    self.footView.backgroundColor = [UIColor clearColor];        [self drawTitleCollection];    [self drawColPage];}-(void)drawColPage{    //284/376    CGFloat cellWidth = (SCREEN_WIDTH-20-10)/2.0;    CGFloat cellHeight = cellWidth*(188/167.0);        self.flowLayout = [[UICollectionViewFlowLayout alloc]init];    self.flowLayout.itemSize = CGSizeMake(cellWidth, cellHeight+10);    self.flowLayout.minimumLineSpacing = 10;    self.flowLayout.minimumInteritemSpacing = 10;    self.flowLayout.sectionInset = UIEdgeInsetsMake(0, 10, 0, 10);    self.flowLayout.footerReferenceSize = CGSizeMake(self.myTableView.bounds.size.width, 0.0001);    self.flowLayout.headerReferenceSize = CGSizeMake(self.myTableView.bounds.size.width, 0.0001);    self.myColView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_WIDTH) collectionViewLayout:self.flowLayout];    self.myColView.delegate = self;    self.myColView.dataSource = self;    self.myColView.bounces = YES;    self.myColView.scrollEnabled = NO;    self.myColView.backgroundColor = [UIColor whiteColor];    self.myColView.showsHorizontalScrollIndicator = NO;    self.myColView.showsVerticalScrollIndicator = NO;    [self.footView addSubview:self.myColView];    [self.myColView mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.mas_equalTo(self.labelTL.mas_bottom).mas_offset(TEXT_EDGE_DISTANCE);        make.left.right.mas_equalTo(self.footView);        make.height.mas_equalTo(100);    }];        [self.myColView registerClass:[SearchGoodsColCell class] forCellWithReuseIdentifier:@"SearchGoodsColCell_order"];        [self.myColView layoutIfNeeded];            [self.myColView addObserver:self forKeyPath:@"contentSize" options:0 context:NULL];    }//监听contentSize变化改变约束- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {        CGRect frame = self.myColView.frame;    frame.size = self.myColView.contentSize;    self.footView.frame = CGRectMake(0, 0, SCREEN_WIDTH, frame.size.height);    [self.footView layoutIfNeeded];    self.myTableView.tableFooterView = self.footView;    [self.myColView mas_remakeConstraints:^(MASConstraintMaker *make) {        make.top.mas_equalTo(self.labelTL.mas_bottom).mas_offset(TEXT_EDGE_DISTANCE);        make.left.right.mas_equalTo(self.footView);        make.height.mas_equalTo(frame.size.height);    }];}-(void)drawTitleCollection{    //你喜欢    self.labelTL = [[UILabel alloc]init];    [self.footView addSubview:self.labelTL];    self.labelTL.font = MIDDLE_LIT_FONT;    self.labelTL.textColor = RGB(141, 139, 140);    self.labelTL.text = @"猜你喜欢";    [self.labelTL mas_makeConstraints:^(MASConstraintMaker *make) {        make.centerX.mas_equalTo(self.footView.mas_centerX);        make.top.mas_equalTo(self.footView.mas_top).mas_offset(TEXT_EDGE_DISTANCE);    }];    [self.labelTL layoutIfNeeded];    //左线    UIView *leftVLine = [[UIView alloc]init];    [self.footView addSubview:leftVLine];    leftVLine.backgroundColor = RGB(141, 139, 140);    [leftVLine mas_makeConstraints:^(MASConstraintMaker *make) {        make.centerY.mas_equalTo(self.labelTL.mas_centerY);        make.right.mas_equalTo(self.labelTL.mas_left).mas_offset(-TEXT_EDGE_DISTANCE);        make.size.mas_equalTo(CGSizeMake(33, 0.5));    }];    //右线    UIView *rightVLine = [[UIView alloc]init];    [self.footView addSubview:rightVLine];    rightVLine.backgroundColor = RGB(141, 139, 140);    [rightVLine mas_makeConstraints:^(MASConstraintMaker *make) {        make.centerY.mas_equalTo(self.labelTL.mas_centerY);        make.left.mas_equalTo(self.labelTL.mas_right).mas_offset(TEXT_EDGE_DISTANCE);        make.size.mas_equalTo(CGSizeMake(33, 0.5));    }];}#pragma mark -- collectionVeiw delegate ---(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{    return 1;}-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{    return 10;}-(UICollectionViewCell*)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{    SearchGoodsColCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"SearchGoodsColCell_order" forIndexPath:indexPath];        return cell;}-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{    NSLog(@"选择商品 %ld",indexPath.row);    }#pragma mark -- tableview delegate ---(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return 1;}-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return 0;}-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];        cell.selectionStyle = UITableViewCellSelectionStyleNone;                return cell;}-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    //可以注释    [tableView deselectRowAtIndexPath:indexPath animated:NO];    }-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{    return 0.0001;}-(CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section{    return 0.0001;}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}#pragma mark -- clickedDingDanXiangQingaBtn 订单详情 ---(void)clickedDingDanXiangQingaBtn:(UIButton *)sender{    NSLog(@"clickedDingDanXiangQingaBtn 订单详情");    MineOrderDetailViewController *vc = [[MineOrderDetailViewController alloc]init];    [self.navigationController pushViewController:vc animated:YES];}#pragma mark -- clickedLiJIPIngJiaBtn ---(void)clickedLiJIPIngJiaBtn:(UIButton *)sender{    NSLog(@"clickedLiJIPIngJiaBtn 评价");    MinePublishPingLunViewController *vc = [[MinePublishPingLunViewController alloc]init];    [self.navigationController pushViewController:vc animated:YES];}#pragma mark -- clickedRightBtn 右键 ---(void)clickedRightBtn:(UIButton *)sender{    NSLog(@"clickedRightBtn 右键");    NSMutableArray *arr_tit = [@[@"首页  ",@"帮助  ",@"我要吐槽"] mutableCopy];    NSMutableArray *arr_tu = [@[@"shouye-biao",@"bangzhu-biao",@"woyaotucao-biao"] mutableCopy];    [YBPopupMenu showRelyOnView:sender titles:arr_tit icons:arr_tu menuWidth:120 otherSettings:^(YBPopupMenu *popupMenu) {        popupMenu.delegate = self;        popupMenu.fontSize = 12;        popupMenu.textColor = TEXT_HEX_LIGHT_L_GRAY;    }];}#pragma mark - YBPopupMenuDelegate- (void)ybPopupMenuDidSelectedAtIndex:(NSInteger)index ybPopupMenu:(YBPopupMenu *)ybPopupMenu{    NSLog(@"点击了 %ld 选项",index);}#pragma mark -- goBackPage 返回 ---(void)goBackPage:(id)sender{    [self.navigationController popViewControllerAnimated:YES];}