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UITableView分组的展开与折叠封装

UITableView分组的展开与折叠封装

作者: 见哥哥长高了 | 来源:发表于2017-12-09 13:44 被阅读120次

    好久没写多东西了，唯恐自己被这个世界所遗忘，今天就搞一篇技术文章。（哈哈，刷刷存在感罢了。。。）不废话了，说正经的。之前项目中用到了一个功能：UITableView分组的展开与折叠，今天按其单独模块提出来，分析一下其具体实现逻辑和代码实现：


    功能样式
    实现逻辑

    首先：因为我们操作tableView的时候，控制其展开与折叠的操作是在点击每一个section的头部来完成的，我们就可以从tableView的代理方法：

    -(nullable UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section;

    来入手，因此需要自定义一个响应事件的公共的view。
    其次：自定义一个tableView 继承自：UITableView，实现UITableView的UITableViewDelegate,UITableViewDataSource代理方法，并将这些方法进行一个公共的封装，暴漏成接口，供别的文件来使用。

    实现过程

    下面就来看一下具体代码的实现过程：
    （1）自定义LGJFoldOpenSectionHeader 继承: UIView
    .h

    #import <UIKit/UIKit.h>

//折叠状态
typedef enum : NSUInteger {
    SectionHeaderStateFold,
    SectionHeaderStateOpen,
} SectionHeaderState;

//箭头所在位置 (可扩展)
typedef enum : NSUInteger {
    ArrowPositionLeft,
    ArrowPositionRight,
} ArrowPosition;

@protocol FoldOpenSectionHeaderDelegate <NSObject>

//点击一个分组的头的以后响应方法
- (void)foldOpenSectionHeaderTappedAtIndex:(NSInteger)index;

@end

@interface LGJFoldOpenSectionHeader : UIView

@property (nonatomic, weak) id <FoldOpenSectionHeaderDelegate> delegate;

//初始化与属性设置
- (instancetype)initWithFrame:(CGRect)frame tag:(NSInteger)tag;

- (void)setupWithBackgroundColor:(UIColor *)backgroundColor
                     titleString:(NSString *)titleString
                      titleColor:(UIColor *)titleColor
                       titleFont:(UIFont *)titleFont
               descriptionString:(NSString *)descriptionString
                descriptionColor:(UIColor *)descriptionColor
                 descriptionFont:(UIFont *)descriptionFont
                      arrowImage:(UIImage *)arrowImage
                   arrowPosition:(ArrowPosition)arrowPosition
                    sectionState:(SectionHeaderState)sectionState;
@end

    .m

    #import "LGJFoldOpenSectionHeader.h"

//以下几个参数，均可修改，自行设置
#define LineWidth 0.3f
#define Margin 8.0f
#define IconSize 24.0f

@interface LGJFoldOpenSectionHeader()

@property(nonatomic, strong)UILabel *titleLabel;
@property(nonatomic, strong)UILabel *descriptionLabel;
@property(nonatomic, strong)UIImageView *arrowImageView;
@property(nonatomic, strong)CAShapeLayer *sepertorLine;
@property(nonatomic, assign)SectionHeaderState status;
@property(nonatomic, assign)ArrowPosition position;
@property(nonatomic, strong)UITapGestureRecognizer *tap;

@end

@implementation LGJFoldOpenSectionHeader

-(instancetype)initWithFrame:(CGRect)frame tag:(NSInteger)tag{
    self = [super initWithFrame:frame];
    if (self) {
        self.tag = tag;
        [self setupSubviewsWithArrowPosition:ArrowPositionRight];
    }
    return self;
}

-(void)awakeFromNib{
    [super awakeFromNib];
    [self setupSubviewsWithArrowPosition:ArrowPositionRight];
}

-(void)setupWithBackgroundColor:(UIColor *)backgroundColor
                    titleString:(NSString *)titleString
                     titleColor:(UIColor *)titleColor
                      titleFont:(UIFont *)titleFont
              descriptionString:(NSString *)descriptionString
               descriptionColor:(UIColor *)descriptionColor
                descriptionFont:(UIFont *)descriptionFont
                     arrowImage:(UIImage *)arrowImage
                  arrowPosition:(ArrowPosition)arrowPosition
                   sectionState:(SectionHeaderState)sectionState{
    [self setBackgroundColor:backgroundColor];
    self.titleLabel.text = titleString;
    self.titleLabel.textColor = titleColor;
    self.titleLabel.font = titleFont;
    
    self.descriptionLabel.text = descriptionString;
    self.descriptionLabel.textColor = descriptionColor;
    self.descriptionLabel.font = descriptionFont;
    self.arrowImageView.image = arrowImage;
    self.status = sectionState;
    self.position = arrowPosition;
    if (sectionState == SectionHeaderStateOpen) {
        if (arrowPosition == ArrowPositionRight) {
            self.arrowImageView.transform = CGAffineTransformMakeRotation(-M_PI/2);
        }else{
            self.arrowImageView.transform = CGAffineTransformMakeRotation(M_PI/2);
        }
    }else{
        if (arrowPosition == ArrowPositionRight) {
            _arrowImageView.transform = CGAffineTransformMakeRotation(M_PI/2);
        }else{
            _arrowImageView.transform = CGAffineTransformMakeRotation(0);
        }
    }
}
-(void)setupSubviewsWithArrowPosition:(ArrowPosition)arrowPosition{
    CGFloat labelWidth = (self.frame.size.width - Margin * 2 - IconSize) / 2;
    CGFloat labelHeight = self.frame.size.height;
    CGRect arrowRect = CGRectMake(0, (self.frame.size.height - IconSize) / 2, IconSize, IconSize);
    CGRect titleRect =  CGRectMake(Margin + IconSize, 0, labelWidth, labelHeight);
    CGRect descripRect = CGRectMake(Margin + IconSize + labelWidth, 0, labelWidth, labelHeight);
    if (arrowPosition == ArrowPositionRight) {
        arrowRect.origin.x = Margin*2 + labelWidth*2;
        titleRect.origin.x = Margin;
        descripRect.origin.x = Margin + labelWidth;
    }
    [self.titleLabel setFrame:titleRect];
    [self.descriptionLabel setFrame:descripRect];
    [self.arrowImageView setFrame:arrowRect];
    [self.sepertorLine setPath:[self getSepertorPath].CGPath];
    
    [self addSubview:self.titleLabel];
    [self addSubview:self.descriptionLabel];
    [self addSubview:self.arrowImageView];
    [self addGestureRecognizer:self.tap];
    [self.layer addSublayer:self.sepertorLine];
}


-(UIBezierPath *)getSepertorPath{
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:CGPointMake(0, self.frame.size.height - LineWidth)];
    [path addLineToPoint:CGPointMake(self.frame.size.width, self.frame.size.height - LineWidth)];
    return path;
}

#pragma mark------Lazy loading
-(UILabel *)titleLabel{
    if (!_titleLabel) {
        _titleLabel = [[UILabel alloc]initWithFrame:CGRectZero];
        _titleLabel.backgroundColor = [UIColor clearColor];
        _titleLabel.textAlignment = NSTextAlignmentLeft;
    }
    return _titleLabel;
}
-(UILabel *)descriptionLabel{
    if (!_descriptionLabel) {
        _descriptionLabel = [[UILabel alloc]initWithFrame:CGRectZero];
        _descriptionLabel.backgroundColor = [UIColor clearColor];
        _descriptionLabel.textAlignment = NSTextAlignmentRight;
    }
    return _descriptionLabel;
}
-(UIImageView *)arrowImageView{
    if (!_arrowImageView) {
        _arrowImageView = [[UIImageView alloc]initWithFrame:CGRectZero];
        _arrowImageView.backgroundColor = [UIColor clearColor];
        _arrowImageView.contentMode = UIViewContentModeScaleAspectFit;
    }
    return _arrowImageView;
}
- (CAShapeLayer *)sepertorLine
{
    if (!_sepertorLine) {
        _sepertorLine = [CAShapeLayer layer];
        _sepertorLine.strokeColor = [UIColor whiteColor].CGColor;
        _sepertorLine.lineWidth = LineWidth;
    }
    return _sepertorLine;
}
-(UITapGestureRecognizer *)tap{
    if (!_tap) {
        _tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAction:)];
    }
    return _tap;
}

-(void)tapAction:(UITapGestureRecognizer *)sender{
    [self shouldExpand:![NSNumber numberWithInteger:self.status].boolValue];
    if ([self.delegate respondsToSelector:@selector(foldOpenSectionHeaderTappedAtIndex:)]) {
        self.status = [NSNumber numberWithBool:(![NSNumber numberWithInteger:self.status].boolValue)].integerValue;
        [self.delegate foldOpenSectionHeaderTappedAtIndex:self.tag];
    }
}

-(void)shouldExpand:(BOOL)expand{
    [UIView animateWithDuration:.2 animations:^{
        if (expand) {
            if (self.position == ArrowPositionRight) {
                self.arrowImageView.transform = CGAffineTransformMakeRotation(-M_PI / 2);
            }else{
                self.arrowImageView.transform = CGAffineTransformMakeRotation(M_PI / 2);
            }
        }else{
            if (self.position == ArrowPositionRight) {
                self.arrowImageView.transform = CGAffineTransformMakeRotation(M_PI / 2);
            }else{
                self.arrowImageView.transform = CGAffineTransformMakeRotation(0);
            }
        }
    } completion:^(BOOL finished) {
        if (finished) {
            self.sepertorLine.hidden = expand;
        }
    }];
}
@end
    具体UI样式如何，我们可以根据不同的应用场景来具体实现，以上只是参考。创建出来之后就是下面这样： 样式1 小图标在右
    样式2 小图标在右

    （2）自定义LGJFoldOpenTableView : UITableView并实现UITableViewDelegate,UITableViewDataSource
    .h

    #import <UIKit/UIKit.h>
#import "LGJFoldOpenSectionHeader.h"
@class LGJFoldOpenTableView;
@protocol LGJFoldOpenTableViewDelegate <NSObject>

@required
/**
 *  箭头的位置
 */
- (ArrowPosition)jj_positionForTableView:(LGJFoldOpenTableView *)tableView;
/**
 *  返回section的个数
 */
- (NSInteger )jj_numberOfSectionForTableView:(LGJFoldOpenTableView *)tableView;
/**
 *  cell的个数
 */
- (NSInteger )jj_foldingTableView:(LGJFoldOpenTableView *)tableView numberOfRowsInSection:(NSInteger )section;
/**
 *  header的高度
 */
- (CGFloat )jj_foldingTableView:(LGJFoldOpenTableView *)tableView heightForHeaderInSection:(NSInteger )section;
/**
 *  cell的高度
 */
- (CGFloat )jj_foldingTableView:(LGJFoldOpenTableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
/**
 *  header的标题
 */
- (NSString *)jj_foldingTableView:(LGJFoldOpenTableView *)tableView titleForHeaderInSection:(NSInteger )section;
/**
 *  返回cell
 */
- (UITableViewCell *)jj_foldingTableView:(LGJFoldOpenTableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
/**
 *  点击cell
 */
- (void )jj_foldingTableView:(LGJFoldOpenTableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;


@optional

/**
 *  箭头图片
 */
- (UIImage *)jj_foldingTableView:(LGJFoldOpenTableView *)tableView arrowImageForSection:(NSInteger )section;

/**
 *  下面是一些属性的设置
 */
- (NSString *)jj_foldingTableView:(LGJFoldOpenTableView *)tableView descriptionForHeaderInSection:(NSInteger )section;

- (UIColor *)jj_foldingTableView:(LGJFoldOpenTableView *)tableView backgroundColorForHeaderInSection:(NSInteger )section;

- (UIFont *)jj_foldingTableView:(LGJFoldOpenTableView *)tableView fontForTitleInSection:(NSInteger )section;

- (UIFont *)jj_foldingTableView:(LGJFoldOpenTableView *)tableView fontForDescriptionInSection:(NSInteger )section;

- (UIColor *)jj_foldingTableView:(LGJFoldOpenTableView *)tableView textColorForTitleInSection:(NSInteger )section;

- (UIColor *)jj_foldingTableView:(LGJFoldOpenTableView *)tableView textColorForDescriptionInSection:(NSInteger )section;

@end

@interface LGJFoldOpenTableView : UITableView<UITableViewDelegate,UITableViewDataSource>

@property (nonatomic, weak) id<LGJFoldOpenTableViewDelegate> foldingDelegate;
@property (nonatomic, assign) SectionHeaderState state;

@end

    .m

    #import "LGJFoldOpenTableView.h"

@interface LGJFoldOpenTableView ()<FoldOpenSectionHeaderDelegate>

@property (nonatomic, strong) NSMutableArray *statusArray;

@end

@implementation LGJFoldOpenTableView

#pragma mark------Initialize
- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self setupDelegateAndDataSource];
    }
    return self;
}


- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if (self) {
        [self setupDelegateAndDataSource];
    }
    return self;
}

- (void)setupDelegateAndDataSource
{
    // 适配iOS 11
#ifdef __IPHONE_11_0
    if ([self respondsToSelector:@selector(setContentInsetAdjustmentBehavior:)]) {
        self.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    }
    self.estimatedRowHeight = 0;
    self.estimatedSectionHeaderHeight = 0;
    self.estimatedSectionFooterHeight = 0;
#endif
    
    self.delegate = self;
    self.dataSource = self;
    if (self.style == UITableViewStylePlain) {
        self.tableFooterView = [[UIView alloc] init];
    }
    // 添加监听
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onChangeStatusBarOrientationNotification:)  name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];
}

- (NSMutableArray *)statusArray
{
    if (!_statusArray) {
        _statusArray = [NSMutableArray array];
    }
    
    if (!_state) {
        _state = SectionHeaderStateFold;
    }
    if (_statusArray.count) {
        if (_statusArray.count > self.numberOfSections) {
            [_statusArray removeObjectsInRange:NSMakeRange(self.numberOfSections - 1, _statusArray.count - self.numberOfSections)];
        }else if (_statusArray.count < self.numberOfSections) {
            for (NSInteger i = self.numberOfSections - _statusArray.count; i < self.numberOfSections; i++) {
                [_statusArray addObject:[NSNumber numberWithInteger:_state]];
            }
        }
    }else{
        for (NSInteger i = 0; i < self.numberOfSections; i++) {
            [_statusArray addObject:[NSNumber numberWithInteger:_state]];
        }
    }
    return _statusArray;
}

- (void)onChangeStatusBarOrientationNotification:(NSNotification *)notification
{
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [self reloadData];
    });
}

#pragma mark - UI Configration
-(ArrowPosition )perferedArrowPosition{
    if (self.foldingDelegate && [self.foldingDelegate respondsToSelector:@selector(jj_positionForTableView:)]) {
        [self.foldingDelegate jj_positionForTableView:self];
    }
    return ArrowPositionRight;
}
- (UIColor *)backgroundColorForSection:(NSInteger )section
{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:backgroundColorForHeaderInSection:)]) {
        return [_foldingDelegate jj_foldingTableView:self backgroundColorForHeaderInSection:section];
    }
    return [UIColor colorWithRed:102/255.f green:102/255.f blue:255/255.f alpha:1.f];
}

- (NSString *)titleForSection:(NSInteger )section
{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:titleForHeaderInSection:)]) {
        return [_foldingDelegate jj_foldingTableView:self titleForHeaderInSection:section];
    }
    return [NSString string];
}

- (UIFont *)titleFontForSection:(NSInteger )section
{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:fontForTitleInSection:)]) {
        return [_foldingDelegate jj_foldingTableView:self fontForTitleInSection:section];
    }
    return [UIFont boldSystemFontOfSize:16];
}

- (UIColor *)titleColorForSection:(NSInteger )section
{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:textColorForTitleInSection:)]) {
        return [_foldingDelegate jj_foldingTableView:self textColorForTitleInSection:section];
    }
    return [UIColor whiteColor];
}

- (NSString *)descriptionForSection:(NSInteger )section
{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:descriptionForHeaderInSection:)]) {
        return [_foldingDelegate jj_foldingTableView:self descriptionForHeaderInSection:section];
    }
    return [NSString string];
}
- (UIFont *)descriptionFontForSection:(NSInteger )section
{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:fontForDescriptionInSection:)]) {
        return [_foldingDelegate jj_foldingTableView:self fontForDescriptionInSection:section];
    }
    return [UIFont boldSystemFontOfSize:13];
}
- (UIColor *)descriptionColorForSection:(NSInteger )section
{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:textColorForDescriptionInSection:)]) {
        return [_foldingDelegate jj_foldingTableView:self textColorForDescriptionInSection:section];
    }
    return [UIColor whiteColor];
}
- (UIImage *)arrowImageForSection:(NSInteger )section
{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:arrowImageForSection:)]) {
        return [_foldingDelegate jj_foldingTableView:self arrowImageForSection:section];
    }
    return [UIImage imageNamed:@"Arrow"];
}

#pragma mark - UITableViewDelegate,UITableViewDataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_numberOfSectionForTableView:)]) {
        return [_foldingDelegate jj_numberOfSectionForTableView:self];
    }else{
        return self.numberOfSections;
    }
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (((NSNumber *)self.statusArray[section]).integerValue == SectionHeaderStateOpen) {
        if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:numberOfRowsInSection:)]) {
            return [_foldingDelegate jj_foldingTableView:self numberOfRowsInSection:section];
        }
    }
    return 0;
}
-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:heightForHeaderInSection:)]) {
        return [_foldingDelegate jj_foldingTableView:self heightForHeaderInSection:section];
    }else{
        return self.sectionHeaderHeight;
    }
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:heightForRowAtIndexPath:)]) {
        return [_foldingDelegate jj_foldingTableView:self heightForRowAtIndexPath:indexPath];
    }else{
        return self.rowHeight;
    }
}
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
    if (self.style == UITableViewStylePlain) {
        return 0;
    }else{
        return 0.001;
    }
}
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    LGJFoldOpenSectionHeader *sectionHeaderView = [[LGJFoldOpenSectionHeader alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, [self tableView:self heightForHeaderInSection:section])  tag:section];
    
    [sectionHeaderView setupWithBackgroundColor:[self backgroundColorForSection:section]
                                    titleString:[self titleForSection:section]
                                     titleColor:[self titleColorForSection:section]
                                      titleFont:[self titleFontForSection:section]
                              descriptionString:[self descriptionForSection:section]
                               descriptionColor:[self descriptionColorForSection:section]
                                descriptionFont:[self descriptionFontForSection:section]
                                     arrowImage:[self arrowImageForSection:section]
                                  arrowPosition:[self perferedArrowPosition]
                                   sectionState:((NSNumber *)self.statusArray[section]).integerValue];
    
    sectionHeaderView.delegate = self;
    
    return sectionHeaderView;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:cellForRowAtIndexPath:)]) {
        return [_foldingDelegate jj_foldingTableView:self cellForRowAtIndexPath:indexPath];
    }
    return [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"DefaultCellIndentifier"];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (_foldingDelegate && [_foldingDelegate respondsToSelector:@selector(jj_foldingTableView:didSelectRowAtIndexPath:)]) {
        [_foldingDelegate jj_foldingTableView:self didSelectRowAtIndexPath:indexPath];
    }
}
#pragma mark - FoldOpenSectionHeaderDelegate
- (void)foldOpenSectionHeaderTappedAtIndex:(NSInteger)index
{
    BOOL currentIsOpen = ((NSNumber *)self.statusArray[index]).boolValue;
    
    [self.statusArray replaceObjectAtIndex:index withObject:[NSNumber numberWithBool:!currentIsOpen]];
    
    NSInteger numberOfRow = [_foldingDelegate jj_foldingTableView:self numberOfRowsInSection:!currentIsOpen];
    NSMutableArray *rowArray = [NSMutableArray array];
    if (numberOfRow) {
        for (NSInteger i = 0; i < numberOfRow; i++) {
            [rowArray addObject:[NSIndexPath indexPathForRow:i inSection:index]];
        }
    }
    if (rowArray.count) {
        if (currentIsOpen) {
            [self deleteRowsAtIndexPaths:[NSArray arrayWithArray:rowArray] withRowAnimation:UITableViewRowAnimationTop];
        }else{
            [self insertRowsAtIndexPaths:[NSArray arrayWithArray:rowArray] withRowAnimation:UITableViewRowAnimationTop];
        }
    }
}
@end
    使用

    准备工作都已经做完了之后，使用起来也是相当的方便，我们需要在使用到的地方导入

    #import "LGJFoldOpenTableView.h"

    并实现：LGJFoldOpenTableViewDelegate即可
    如下：

    #import "TestViewController.h"

@interface TestViewController ()<LGJFoldOpenTableViewDelegate>

@property(nonatomic,strong)LGJFoldOpenTableView *tableView;
@end

@implementation TestViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    self.automaticallyAdjustsScrollViewInsets = NO;
    [self createFoldTableView];
    
}
-(void)createFoldTableView{
    LGJFoldOpenTableView *tab = [[LGJFoldOpenTableView alloc]initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height)];
    self.tableView = tab;
    [self.view addSubview:tab];
    tab.foldingDelegate = self;
    if (self.position) {
        tab.state =  SectionHeaderStateOpen;
    }
}


/**
 *  箭头的位置
 */
- (ArrowPosition)jj_positionForTableView:(LGJFoldOpenTableView *)tableView{
    return self.position ? : ArrowPositionLeft;
}
/**
 *  返回section的个数
 */
- (NSInteger )jj_numberOfSectionForTableView:(LGJFoldOpenTableView *)tableView{
    return 6;
}
/**
 *  cell的个数
 */
- (NSInteger )jj_foldingTableView:(LGJFoldOpenTableView *)tableView numberOfRowsInSection:(NSInteger )section{
    return 5;
}
/**
 *  header的高度
 */
- (CGFloat )jj_foldingTableView:(LGJFoldOpenTableView *)tableView heightForHeaderInSection:(NSInteger )section{
    return 40;
}
/**
 *  cell的高度
 */
- (CGFloat )jj_foldingTableView:(LGJFoldOpenTableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return 30;
}
/**
 *  header的标题
 */
- (NSString *)jj_foldingTableView:(LGJFoldOpenTableView *)tableView titleForHeaderInSection:(NSInteger )section{
    return [NSString stringWithFormat:@"第%ld组",section + 1];
}
/**
 *  返回cell
 */
- (UITableViewCell *)jj_foldingTableView:(LGJFoldOpenTableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *cellID = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
    if (cell == nil) {
        cell =[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
    }
    cell.textLabel.text = [NSString stringWithFormat:@"%ld",indexPath.row + 1];
    return cell;
}
/**
 *  点击cell
 */
- (void )jj_foldingTableView:(LGJFoldOpenTableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

-(NSString *)jj_foldingTableView:(LGJFoldOpenTableView *)tableView descriptionForHeaderInSection:(NSInteger)section{
    return @"descriptionForHeader";
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
@end

    以上也许还有很多不足，欢迎各路大神，批评指正···

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