二级联动

二级联动，可以左侧是一个tabview右侧也是一个tabview，也可以左侧一排按钮，右侧tabview，点击左侧，刷新右侧数据，这一步很简单，我当时不理解的是右侧数据滑动，左侧怎么刷新呢，这需要考虑到tabview的加载方式是动态的，也就是说，当新的数据在右侧tabview加载的时候，比如一个新的section加载的时候，一定会走这个方法：

-(UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{

    if (tableView.tag == 21) {

        if (isScrollSetSelect == YES) {

            [leftScrollView setSelectButtonWithIndexPathSection:section];

        }

        return [self viewForHeaderView:section];

    }else{

        return nil;

    }

}

/实际需要会修改

-(UIView*)viewForHeaderView:(NSInteger)parama{

    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, kScreenWidth, 32)];

    label.backgroundColor = [UIColor grayColor];

    if (leftDataSource.count != 0) {

        label.text = leftDataSource[parama];

        //        [NSString stringWithFormat:@"第%ld组",(long)parama];

    }

    return label;

}

这个就是实现二级联动的重要核地方，当右侧滑动，需要新的数组加载的时候，当创建新的section头部视图时候，在这个时候可以刷新左侧的视图。

//

//  LeftSelectScroll.h

//  YiLeHelp

//

//  Created by ChenYi on 15/11/14.

//  Copyright © 2015年 JC. All rights reserved.

//

//尺寸定义

#define kScreenWidth [UIScreen mainScreen].bounds.size.width//屏幕的宽度

#define kScreenHeight [[UIScreen mainScreen] bounds].size.height//屏幕的高度

#define kNav_H kScreenHeight > 668 ? 86 : 64//屏幕的高度

#define kTabbar_H kScreenHeight > 668 ? 59 : 49//屏幕的高度

#import <UIKit/UIKit.h>

/*

@protocol LeftSelectScrollDataSource <NSObject>

- (NSInteger)numberOfRowsInSection;

- (UIButton*)viewForRowAtIndexPath:(NSInteger *)indexPath;

@end

*/

@protocol LeftSelectScrollDelegate <NSObject>

-(void)clickLeftSelectScrollButton:(NSInteger)indexPath;

@end

@interface LeftSelectScroll : UIScrollView

@property(nonatomic,strong)NSArray *leftSelectArray;

@property (nonatomic,strong)id<LeftSelectScrollDelegate>leftSelectDelegate;

-(void)setLeftSelectArray:(NSArray *)leftSelectArray;

-(void)setSelectButtonWithIndexPathSection:(NSInteger)indexPathSection;

// Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier:

// Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls)

@end

// 版权属于原作者

// http://code4app.com (cn) http://code4app.net (en)

// 发布代码于最专业的源码分享网站: Code4App.com

//

//  LeftSelectScroll.m

//  YiLeHelp

//

//  Created by ChenYi on 15/11/14.

//  Copyright © 2015年 JC. All rights reserved.

//

#import "LeftSelectScroll.h"

@implementation LeftSelectScroll

{

    UIButton *tempSelectButton;

}

-(instancetype)initWithFrame:(CGRect)frame{

    if (self = [super initWithFrame:frame]) {

        self.userInteractionEnabled = YES;

        tempSelectButton = [[UIButton alloc]init];

    }

    return self;

}

-(void)setLeftSelectArray:(NSArray *)leftSelectArray{

    _leftSelectArray = leftSelectArray;

//    NSArray *array = @[@"套餐",@"饮料",@"点心",@"小菜"];

//    _leftSelectArray = array;

    

    for (int i = 0; i<_leftSelectArray.count; i++) {

        UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(0, 53*i, kScreenWidth*0.25, 53)];

        [button setTitle:_leftSelectArray[i] forState:UIControlStateNormal];

        [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

        [button setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected];

        

        [button setBackgroundColor:[UIColor whiteColor]];

        

        UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, button.frame.size.height - 0.5, button.frame.size.width, 0.5)];

//        label.backgroundColor = MYCOLOR_LineColor;

        label.backgroundColor = [UIColor grayColor];

        

        [button addSubview:label];

        

        [self addSubview:button];

        

        [button addTarget:self action:@selector(clickLeftSelectButton:)forControlEvents:UIControlEventTouchUpInside];

        button.tag = i+11;

        if (i == 0) {

            [button setSelected:YES];

            [button setBackgroundColor:[UIColor orangeColor]];

            tempSelectButton = button;

        }

    }

}

-(void)clickLeftSelectButton:(UIButton*)button{

    

    [tempSelectButton setSelected:NO];

    [tempSelectButton setBackgroundColor:[UIColor whiteColor]];

    

    [button setBackgroundColor:[UIColor blueColor]];

    [button setSelected:YES];

    

    tempSelectButton = button;

    

    NSInteger tag = button.tag - 11;

    if (self.leftSelectDelegate && [self.leftSelectDelegaterespondsToSelector:@selector(clickLeftSelectScrollButton:)]) {

        [self.leftSelectDelegate clickLeftSelectScrollButton:tag];

    }

}

-(void)setSelectButtonWithIndexPathSection:(NSInteger)indexPathSection{

    for (int i = 0; i< _leftSelectArray.count; i++) {

        NSInteger tag = i + 11 ;

        

        UIButton *btn = (UIButton*)[self viewWithTag:tag];

        if (btn.tag == indexPathSection + 11) {

            tempSelectButton = btn;

            [btn setSelected:YES];

            btn.backgroundColor = [UIColor blueColor];

        }else{

            [btn setSelected:NO];

            btn.backgroundColor = [UIColor whiteColor];

        }

    }

    

}

/*

// Only override drawRect: if you perform custom drawing.

// An empty implementation adversely affects performance during animation.

- (void)drawRect:(CGRect)rect {

    // Drawing code

}

*/

@end

// 版权属于原作者

// http://code4app.com (cn) http://code4app.net (en)

// 发布代码于最专业的源码分享网站: Code4App.com

//

//  DetailsViewController.h

//  yileDemo

//

//  Created by ChenYi on 15/12/16.

//  Copyright © 2015年 ChenYi. All rights reserved.

//

//尺寸定义

#define kScreenWidth [UIScreen mainScreen].bounds.size.width//屏幕的宽度

#define kScreenHeight [[UIScreen mainScreen] bounds].size.height//屏幕的高度

#define kNav_H kScreenHeight > 668 ? 86 : 64//屏幕的高度

#define kTabbar_H kScreenHeight > 668 ? 59 : 49//屏幕的高度

//RGBA设置颜色

#define RGBA(r,g,b,a) [UIColor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f alpha:a]

#import <UIKit/UIKit.h>

@interface DetailsViewController : UIViewController

@end

// 版权属于原作者

// http://code4app.com (cn) http://code4app.net (en)

// 发布代码于最专业的源码分享网站: Code4App.com

//

//  DetailsViewController.m

//  yileDemo

//

//  Created by ChenYi on 15/12/16.

//  Copyright © 2015年 ChenYi. All rights reserved.

//

#import "DetailsViewController.h"

#import "LeftSelectScroll.h"

@interface DetailsViewController ()<LeftSelectScrollDelegate,UITableViewDataSource,UITableViewDelegate>

{

    LeftSelectScroll *leftScrollView;

    

    NSMutableArray *leftDataSource;

    //当点击的时候 不去调用滑动调节

    BOOL isScrollSetSelect;

    UITableView *tableViewList;

}

@end

@implementation DetailsViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];

    [self initObjects];

    

    [self creatLeftScrollView];

    

    [self createTableView];

    // Do any additional setup after loading the view.

}

-(void)initObjects{

    leftDataSource = [[NSMutableArray alloc]initWithObjects:@"套餐1",@"套餐2",@"套餐3",@"套餐4", nil];

}

-(void)createTableView{

    //设置右侧菜单frame  -(kTabbar_H)底部那部分高度

    tableViewList = [[UITableView alloc]initWithFrame:CGRectMake(CGRectGetMaxX(leftScrollView.frame), kNav_H, kScreenWidth*0.75, kScreenHeight - (kNav_H))];

    tableViewList.delegate = self;

    tableViewList.dataSource = self;

    tableViewList.tag = 21;//标识tableView

    [self.view addSubview:tableViewList];

    tableViewList.separatorStyle = UITableViewCellSeparatorStyleNone;

    

    tableViewList.scrollEnabled = YES;

}

-(void)creatLeftScrollView{

    

    leftScrollView = [[LeftSelectScroll alloc]initWithFrame:CGRectMake(0, 0, kScreenWidth*0.25, kScreenHeight-(kNav_H)-(kTabbar_H))];

    

    leftScrollView.backgroundColor = [UIColor whiteColor];

    

    [leftScrollView setLeftSelectArray:leftDataSource];

    

    leftScrollView.leftSelectDelegate = self;

    

    leftScrollView.delegate = self;

    

    [self.view addSubview:leftScrollView];

}

#pragma mark 点击左侧切换右侧的代理方法

-(void)clickLeftSelectScrollButton:(NSInteger)indexPath{

    isScrollSetSelect = NO;

    

    [tableViewList scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:indexPath] atScrollPosition:UITableViewScrollPositionTop animated:YES];

}

-(UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{

    if (tableView.tag == 21) {

        if (isScrollSetSelect == YES) {

            [leftScrollView setSelectButtonWithIndexPathSection:section];

        }

        return [self viewForHeaderView:section];

    }else{

        return nil;

    }

}

//实际需要会修改

-(UIView*)viewForHeaderView:(NSInteger)parama{

    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, kScreenWidth, 32)];

    label.backgroundColor = [UIColor grayColor];

    if (leftDataSource.count != 0) {

        label.text = leftDataSource[parama];

        //        [NSString stringWithFormat:@"第%ld组",(long)parama];

    }

    return label;

}

#pragma mark UITableViewDelegate

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{

    

        return  leftDataSource.count ;

}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    

    return 5;

    

}

-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{

    return 25;

}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{

    return 64;

}

-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

    

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"tableViewCellIdentF"];

    if (cell == nil) {

        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefaultreuseIdentifier:@"tableViewCellIdentF"];

    }

    cell.backgroundColor = RGBA(150*(indexPath.section + 1 ), 50*(indexPath.section + 1 ) , 25*(indexPath.section+ 1 ),1);

    cell.textLabel.text = [NSString stringWithFormat:@"菜品%ld",indexPath.row + 1];

    return cell;

}

-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{

    isScrollSetSelect = YES ;

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

/*

#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    // Get the new view controller using [segue destinationViewController].

    // Pass the selected object to the new view controller.

}

*/

@end