关于数据源跟事件封装实例

#import <UIKit/UIKit.h>

@class XWDropdownMenu;
#pragma mark 数据源方法
@protocol XWDropdownMenuDataSource <NSObject>
@required
/**
 *  主表格一共有多少行
 */
- (NSInteger)numberOfRowsInMainTable:(XWDropdownMenu *)dropdownMenu;
/**
 *  主表格每一行的标题
 *  @param row          行号
 */
- (NSString *)dropdownMenu:(XWDropdownMenu *)dropdownMenu titleForRowInMainTable:(NSInteger)row;
/**
 *  主表格每一行的子数据 数组
 *  @param row          行号
 */
- (NSArray *)dropdownMenu:(XWDropdownMenu *)dropdownMenu subdataForRowInMainTable:(NSInteger)row;
@optional
/**
 *  主表格每一行 分类数量
 *  @param row          行号
 */
- (NSString *)dropdownMenu:(XWDropdownMenu *)dropdownMenu countForRowInMainTable:(NSInteger)row;
/**
 *  子表格每一行子数据 分类数量
 *  @param row          行号
 */
- (NSArray *)dropdownMenu:(XWDropdownMenu *)dropdownMenu subdataCountForRowInSubTable:(NSInteger)row;
/**
 *  主表格每一行的图标
 *  @param row          行号
 */
- (NSString *)dropdownMenu:(XWDropdownMenu *)dropdownMenu iconForRowInMainTable:(NSInteger)row;
/**
 *  子表格每一行的选中图标
 *  @param row          行号
 */
- (NSString *)dropdownMenu:(XWDropdownMenu *)dropdownMenu selectedIconForRowInMainTable:(NSInteger)row;
@end

#pragma mark 代理方法
@protocol XWDropdownMenuDelegate <NSObject>

@optional
- (void)dropdownMenu:(XWDropdownMenu *)dropdownMenu didSelectRowInMainTable:(NSInteger)row;
- (void)dropdownMenu:(XWDropdownMenu *)dropdownMenu didSelectRowInSubTable:(NSInteger)subrow inMainTable:(NSInteger)mainRow;

@end

#pragma mark 构造方法
@interface XWDropdownMenu : UIView
+ (instancetype)dropdownMenu;
-(void)refreshMenu;

@property (nonatomic, weak) id<XWDropdownMenuDataSource> dataSource;
@property (nonatomic, weak) id<XWDropdownMenuDelegate> delegate;

/**主表被选中的字体颜色，默认是黑色*/
@property (strong, nonatomic) UIColor *selectedRowTextColor;
/**该属性设置成YES，主表比较小*/
@property (nonatomic, assign)BOOL isMainTableSmall;
@end

#import "XWDropdownMenu.h"
#import "XWDropdownMenuMainCell.h"
#import "XWDropdownMenuSubCell.h"
#import "XWBadgeView.h"

#define XWColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]
#define XWUserDefaults [NSUserDefaults standardUserDefaults]
#define kXWLastSelectedMainRow @"XWLastSelectedMainRow"

/** 值越大，主表越小 */
#define kXWTableScale 0.15

@interface XWDropdownMenu()
@property (weak, nonatomic) IBOutlet UITableView *mainTableView;
@property (weak, nonatomic) IBOutlet UITableView *subTableView;
/** 左边主表选中的行号 */
@property (nonatomic, assign) NSInteger selectedMainRow;
/** 表格比例 */
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *tableScale;
@end

@implementation XWDropdownMenu

+ (instancetype)dropdownMenu
{
    return [[[NSBundle mainBundle] loadNibNamed:@"XWDropdownMenu" owner:nil options:nil] firstObject];
}

- (void)awakeFromNib
{
    self.subTableView.backgroundColor = XWColor(245, 245, 245);
    self.selectedMainRow = [[XWUserDefaults objectForKey:kXWLastSelectedMainRow] integerValue];
    self.selectedRowTextColor  = [UIColor blackColor];
}

#pragma mark - 数据源方法
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (tableView == self.mainTableView) {
        if ([self.dataSource respondsToSelector:@selector(numberOfRowsInMainTable:)]) {
            return [self.dataSource numberOfRowsInMainTable:self];
        }
    } else {
        if ([self.dataSource respondsToSelector:@selector(dropdownMenu:subdataForRowInMainTable:)]) {
            return [self.dataSource dropdownMenu:self subdataForRowInMainTable:self.selectedMainRow].count;
        }
    }
    return 0;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = nil;
    //主表
    if (tableView == self.mainTableView) {
        cell = [XWDropdownMenuMainCell cellWithTableView:tableView];

        // 取出数据
        if ([self.dataSource respondsToSelector:@selector(dropdownMenu:titleForRowInMainTable:)]) {
            cell.textLabel.text = [self.dataSource dropdownMenu:self titleForRowInMainTable:indexPath.row];
            cell.textLabel.font = [UIFont systemFontOfSize:14];
            
            if (self.selectedMainRow == indexPath.row) {
                [tableView selectRowAtIndexPath:indexPath animated:YES scrollPosition:UITableViewScrollPositionNone];
                cell.textLabel.textColor = self.selectedRowTextColor;
            }else{
                cell.textLabel.textColor = [UIColor blackColor];
            }
        }
        
        if ([self.dataSource respondsToSelector:@selector(dropdownMenu:iconForRowInMainTable:)]) {
            cell.imageView.image = [UIImage imageNamed:[self.dataSource dropdownMenu:self iconForRowInMainTable:indexPath.row]];
        }
        
        if ([self.dataSource respondsToSelector:@selector(dropdownMenu:selectedIconForRowInMainTable:)]) {
            cell.imageView.highlightedImage = [UIImage imageNamed:[self.dataSource dropdownMenu:self selectedIconForRowInMainTable:indexPath.row]];
        }
        
        if ([self.dataSource respondsToSelector:@selector(dropdownMenu:countForRowInMainTable:)]) {
            XWBadgeView *badgeView = [[XWBadgeView alloc] initWithFrame:CGRectMake(0, 0, 0, 13)];
            badgeView.backgroundColor  = XWColor(205, 205, 205);
            badgeView.textColor = [UIColor whiteColor];
            badgeView.font = [UIFont systemFontOfSize:12];
            badgeView.badgeValue = [self.dataSource dropdownMenu:self countForRowInMainTable:indexPath.row];
            cell.accessoryView = badgeView;
        }
    } else {
        // 从表
        cell = [XWDropdownMenuSubCell cellWithTableView:tableView];
        cell.textLabel.font = [UIFont systemFontOfSize:14];
        if ([self.dataSource respondsToSelector:@selector(dropdownMenu:subdataForRowInMainTable:)]) {
            NSArray *subdata = [self.dataSource dropdownMenu:self subdataForRowInMainTable:self.selectedMainRow];
            cell.textLabel.text = subdata[indexPath.row];
        }
        
        if ([self.dataSource respondsToSelector:@selector(dropdownMenu:subdataCountForRowInSubTable:)]) {
            XWBadgeView *badgeView = [[XWBadgeView alloc] initWithFrame:CGRectMake(0, 0, 0, 13)];
            badgeView.backgroundColor  = XWColor(205, 205, 205);
            badgeView.textColor =  [UIColor whiteColor];
            NSArray *subCount = [self.dataSource dropdownMenu:self subdataCountForRowInSubTable:self.selectedMainRow];
            badgeView.font = [UIFont systemFontOfSize:12];
            badgeView.badgeValue = subCount[indexPath.row];
            cell.accessoryView = badgeView;
        }
    }
    
    return cell;
}

#pragma mark - 代理方法
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (tableView == self.mainTableView) {
        //在这里记录一下上一次选中主表的哪一行
        [XWUserDefaults setObject:[NSString stringWithFormat:@"%ld",indexPath.row] forKey:kXWLastSelectedMainRow];
        
        self.selectedMainRow = indexPath.row;
        [self.mainTableView reloadData];
        [self.subTableView reloadData];
        
        // 通知代理
        if ([self.delegate respondsToSelector:@selector(dropdownMenu:didSelectRowInMainTable:)]) {
            [self.delegate dropdownMenu:self didSelectRowInMainTable:indexPath.row];
        }
    } else {
        // 通知代理
        if ([self.delegate respondsToSelector:@selector(dropdownMenu:didSelectRowInSubTable:inMainTable:)]) {
            [self.delegate dropdownMenu:self didSelectRowInSubTable:indexPath.row inMainTable:self.selectedMainRow];
        }
    }
}

#pragma mark 刷新整个视图 当一个控制器中有多个XWDropdownMenu
-(void)refreshMenu
{
    [self.mainTableView reloadData];
    [self.subTableView reloadData];
}

-(void)setIsMainTableSmall:(BOOL)isMainTableSmall
{
    _isMainTableSmall = isMainTableSmall;
    self.tableScale.constant = !isMainTableSmall ? : self.frame.size.width * kXWTableScale;
}
@end

运用：

#import "XWDropdownMenu.h"

#define XWScreenSize [UIScreen mainScreen].bounds.size

@interface ViewController ()<XWDropdownMenuDataSource,XWDropdownMenuDelegate>
@property (nonatomic, strong)NSMutableArray *mainArray;
@property (nonatomic, strong)NSMutableArray *subArray;
@property (weak, nonatomic) XWDropdownMenu *dropdownMenu;
- (IBAction)showBtnClick:(UIButton *)sender;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self testMenu];
}

//主表数据
-(NSMutableArray *)mainArray
{
    if (!_mainArray) {
        self.mainArray = [NSMutableArray array];
        self.mainArray = [NSMutableArray arrayWithObjects:@"左边测试数据1",@"左边测试数据2",@"左边测试数据3",@"左边测试数据4",@"左边测试数据5",@"左边测试数据6",@"左边测试数据7",nil];
    }
    return _mainArray;
}

//从表数据
-(NSMutableArray *)subArray
{
    if (!_subArray) {
        self.subArray = [NSMutableArray array];
        self.subArray = [NSMutableArray arrayWithObjects:@[@"右测1",@"右侧2"],@[@"右测3",@"右侧4"],@[@"右测5",@"右侧6",@"右侧7"],@[@"右测4"],@[@"右测5"],@[@"右测6"],@[@"右测7"],nil];
    }
    return _subArray;
}

- (IBAction)showBtnClick:(UIButton *)sender {
    self.dropdownMenu.hidden = sender.selected;
    
    sender.selected = !sender.selected;
}

-(void)testMenu
{
    XWDropdownMenu *menu = [XWDropdownMenu dropdownMenu];
    self.dropdownMenu = menu;
//    menu.backgroundColor = [UIColor redColor];
    menu.hidden = YES;
    menu.frame = CGRectMake(0, 120,XWScreenSize.width, 250);
    menu.dataSource = self;
    menu.delegate = self;
    menu.selectedRowTextColor = [UIColor redColor];
    [self.view addSubview:menu];
}

//主表行数
-(NSInteger)numberOfRowsInMainTable:(XWDropdownMenu *)dropdownMenu
{
    return self.mainArray.count;
}

//主表标题
-(NSString *)dropdownMenu:(XWDropdownMenu *)dropdownMenu titleForRowInMainTable:(NSInteger)row
{
    return self.mainArray[row];
}

//子表的数据返回的是一个数组，主表每行都对应一个从表数据数组
-(NSArray *)dropdownMenu:(XWDropdownMenu *)dropdownMenu subdataForRowInMainTable:(NSInteger)row
{
    return self.subArray[row];
}

//主表行未选中图标
-(NSString *)dropdownMenu:(XWDropdownMenu *)dropdownMenu iconForRowInMainTable:(NSInteger)row
{
    return @"collect_icon";
}

//主表行选中图标
-(NSString *)dropdownMenu:(XWDropdownMenu *)dropdownMenu selectedIconForRowInMainTable:(NSInteger)row
{
    return @"collect_icon_selected";
}

//主表行的圆点提示个数
-(NSString *)dropdownMenu:(XWDropdownMenu *)dropdownMenu countForRowInMainTable:(NSInteger)row
{
    return @"10";
}

//从表行的圆点提示个数
-(NSArray *)dropdownMenu:(XWDropdownMenu *)dropdownMenu subdataCountForRowInSubTable:(NSInteger)row
{
    return [NSArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",nil];
}

//主表选中行
-(void)dropdownMenu:(XWDropdownMenu *)dropdownMenu didSelectRowInMainTable:(NSInteger)row
{
    NSLog(@"%@",self.mainArray[row]);
}

//从表选中行
-(void)dropdownMenu:(XWDropdownMenu *)dropdownMenu didSelectRowInSubTable:(NSInteger)subrow inMainTable:(NSInteger)mainRow
{
//    self.dropdownMenu.hidden = YES;
    NSLog(@"%@",self.subArray[mainRow][subrow]);
}



@end

本实例的封装表格是左右两个列表，由于是用故事板的页面操作，所以若用纯代码可以对它进行修改，把创建表格的代码重新写入；