在项目中，我们有时需要使用二叉树来实现多级表格的递归遍历查询，如果对二叉树比较懂，那么写起来其实也不费事，为了节省开发时间，下面介绍一下第三方库TreeTableView-master，这个三方库上给了一些静态的数据展示可供参考。
然而，在实际项目中，数据返回的很多都是json数据，需要自己递归遍历整理后，再将数据传递给TreeTableView作为数据源来实现多级列表。
Github下载地址：https://github.com/yixiangboy/TreeTableView
静态数据测试：
//----------------------------------中国的省地市关系图3,2,1--------------------------------------------
Node *country1 = [[Node alloc] initWithParentId:- nodeId: name:@"中国" depth: expand:YES];
Node *province1 = [[Node alloc] initWithParentId: nodeId: name:@"江苏" depth: expand:NO];
Node *city1 = [[Node alloc] initWithParentId: nodeId: name:@"南通" depth: expand:NO];
Node *city2 = [[Node alloc] initWithParentId: nodeId: name:@"南京" depth: expand:NO];
Node *city3 = [[Node alloc] initWithParentId: nodeId: name:@"苏州" depth: expand:NO];
Node *province2 = [[Node alloc] initWithParentId: nodeId: name:@"广东" depth: expand:NO];
Node *city4 = [[Node alloc] initWithParentId: nodeId: name:@"深圳" depth: expand:NO];
Node *city5 = [[Node alloc] initWithParentId: nodeId: name:@"广州" depth: expand:NO];
Node *province3 = [[Node alloc] initWithParentId: nodeId: name:@"浙江" depth: expand:NO];
Node *city6 = [[Node alloc] initWithParentId: nodeId: name:@"杭州" depth: expand:NO];
//----------------------------------美国的省地市关系图0,1,2--------------------------------------------
Node *country2 = [[Node alloc] initWithParentId:- nodeId: name:@"美国" depth: expand:YES];
Node *province4 = [[Node alloc] initWithParentId: nodeId: name:@"纽约州" depth: expand:NO];
Node *province5 = [[Node alloc] initWithParentId: nodeId: name:@"德州" depth: expand:NO];
Node *city7 = [[Node alloc] initWithParentId: nodeId: name:@"休斯顿" depth: expand:NO];
Node *province6 = [[Node alloc] initWithParentId: nodeId: name:@"加州" depth: expand:NO];
Node *city8 = [[Node alloc] initWithParentId: nodeId: name:@"洛杉矶" depth: expand:NO];
Node *city9 = [[Node alloc] initWithParentId: nodeId: name:@"旧金山" depth: expand:NO]; //----------------------------------日本的省地市关系图0,1,2--------------------------------------------
Node *country3 = [[Node alloc] initWithParentId:- nodeId: name:@"日本" depth: expand:YES];
NSArray *data = [NSArray arrayWithObjects:country1,province1,city1,city2,city3,province2,city4,city5,province3,city6,country2,province4,province5,city7,province6,city8,city9,country3, nil];
TreeTableView *tableview = [[TreeTableView alloc] initWithFrame:CGRectMake(0, 20, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame)-20) withData:data];
tableview.treeTableCellDelegate = self;
[self.view addSubview:tableview];
结果截图显示：
Github上介绍的比较详细，可以自己去看一下。
下面我来对他进行灵活的扩展，对json数据解析递归整理后，使用它利用二叉树的特点实现多级表格显示：
后台返回的json数据格式如下，每一个知识点都有自己的属性，son是用做判断是否有子知识点的条件，son1是子知识点,pid是当前知识点的父节点，knowid是当前知识点的节点，depth是当前知识点的深度等等：
-- ::28.622 Point[:] {
data = (
{
id = ;
knowid = ;
name = "\U6570\U4e0e\U5f0f";
pid = ;
pidA = "0-2-13";
qNum = ;
son = ;
son1 = (
{
depth = ;
id = ;
knowid = ;
name = "\U6709\U7406\U6570";
pid = ;
pidA = "0-2-13-6582";
qNum = ;
son = ;
son1 = (
{
depth = ;
id = ;
knowid = ;
name = "\U6709\U7406\U6570\U7684\U51e0\U4e2a\U6982\U5ff5";
pid = ;
pidA = "0-2-13-6582-6583";
qNum = ;
son = ;
son1 = (
{
depth = ;
id = ;
knowid = ;
name = "\U6b63\U6570\U4e0e\U8d1f\U6570";
pid = ;
pidA = "0-2-13-6582-6583-6584";
qNum = ;
son = ;
url = "http://192.168.0.200//api.php/task1_2/taskadd1_2.html?id=6585&uid=12709";
},
.....................................................................
.....................................................................
创建知识点实例KJPoint如下：
// KJPoint.h
// Point
// Created by mac on 16/6/21.
// Copyright © 2016年 mac. All rights reserved. #import <Foundation/Foundation.h> @interface KJPoint : NSObject @property (copy,nonatomic)NSString *point_depth; //知识点深度
@property (assign,nonatomic)BOOL point_expand; //知识点展开与否 @property (copy,nonatomic)NSString *point_id;
@property (copy,nonatomic)NSString *point_knowid;
@property (copy,nonatomic)NSString *point_name;
@property (copy,nonatomic)NSString *point_pid;
@property (copy,nonatomic)NSString *point_pidA;
@property (copy,nonatomic)NSString *point_qNum;
@property (copy,nonatomic)NSString *point_url;
@property (copy,nonatomic)NSString *point_son; //作为判断是否有子节点的条件
@property (strong,nonatomic)NSArray *point_son1; //子知识点 -(instancetype)initWithPointDic:(NSDictionary *)pointDic; @end // KJPoint.m
// Point
// Created by mac on 16/6/21.
// Copyright © 2016年 mac. All rights reserved. #import "KJPoint.h" @implementation KJPoint -(instancetype)initWithPointDic:(NSDictionary *)pointDic{
self = [super init];
if (self) {
_point_id = [pointDic[@"id"] copy];
_point_depth = [pointDic[@"depth"] copy];
_point_knowid = [pointDic[@"knowid"] copy];
_point_name = [pointDic[@"name"] copy];
_point_pid = [pointDic[@"pid"] copy];
_point_pidA = [pointDic[@"pidA"] copy];
_point_url = [pointDic[@"url"] copy];
_point_qNum = [pointDic[@"qNum"] copy];
_point_son = [pointDic[@"son"] copy];
_point_son1 = pointDic[@"son1"];
}
return self;
} @end
创建控制器实现效果，KJPointViewController类
// ViewController.h
// Point
// Created by mac on 16/6/21.
// Copyright © 2016年 mac. All rights reserved. #import <UIKit/UIKit.h>
@interface KJPonitViewController : UIViewController
@end // ViewController.m
// Point
//
// Created by mac on 16/6/21.
// Copyright © 2016年 mac. All rights reserved.
// #import "KJPonitViewController.h"
#import "HttpTool/KJHttpTool.h"
#import "KJPoint.h"
#import "TreeTableView.h"
#import "Node.h"
@interface KJPonitViewController ()<TreeTableCellDelegate>
@property (strong,nonatomic)NSMutableArray *Points;
@property (strong,nonatomic)NSMutableArray *allPoints;
@end @implementation KJPonitViewController
- (void)viewDidLoad {
[super viewDidLoad];
//获取知识点
[self initPoints];
} -(void)initPoints{ //封装参数
_Points = [NSMutableArray array];
_allPoints = [NSMutableArray array];
NSMutableDictionary *params = [NSMutableDictionary dictionary];
params[@"uid"] = @""; //用户id
params[@"grade"] = @""; //学段：0代表初中、1代表高中//发送请求
[KJHttpTool getWithURL:Point_URL params:params success:^(id json) {
NSLog(@"%@",json); [json[@"data"] enumerateObjectsUsingBlock:^(NSDictionary *pointDic, NSUInteger idx, BOOL * _Nonnull stop) {
KJPoint *point = [[KJPoint alloc]initWithPointDic:pointDic];
point.point_depth = @"";
point.point_expand = YES;
[_Points addObject:point];
}];
[self recursiveAllPoints:_Points]; // //打印输出
// [_allPoints enumerateObjectsUsingBlock:^(KJPoint *point, NSUInteger idx, BOOL * _Nonnull stop) {
// NSLog(@"%@____%@___%d",point.point_name,point.point_depth,point.point_expand);
// }]; //创建Node节点
NSMutableArray *nodes = [NSMutableArray array];
[_allPoints enumerateObjectsUsingBlock:^(KJPoint *point, NSUInteger idx, BOOL * _Nonnull stop) { // NSLog(@"%@----%@----%@",point.point_name,point.point_knowid,point.point_pid); Node *node = [[Node alloc] initWithParentId:[point.point_pid integerValue] nodeId:[point.point_knowid integerValue] name:point.point_name depth:[point.point_depth integerValue] expand:point.point_expand];
[nodes addObject:node];
}]; //TreeTableView
TreeTableView *tableview = [[TreeTableView alloc] initWithFrame:CGRectMake(, , CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame)-) withData:nodes];
tableview.treeTableCellDelegate = self;
[self.view addSubview:tableview]; } failure:^(NSError *error) {
NSLog(@"%@",error);
}];
} //递归所有的知识点
-(void)recursiveAllPoints:(NSMutableArray *)point_arrM{ [point_arrM enumerateObjectsUsingBlock:^(KJPoint *point, NSUInteger idx, BOOL * _Nonnull stop) {
[_allPoints addObject:point]; if ([point.point_son isEqualToString:@""]) {
NSMutableArray *sonPoints = [NSMutableArray array];
[point.point_son1 enumerateObjectsUsingBlock:^(NSDictionary *pointDic, NSUInteger idx, BOOL * _Nonnull stop) {
KJPoint *point = [[KJPoint alloc]initWithPointDic:pointDic];
point.point_expand = NO;
[sonPoints addObject:point];
}];
[self recursiveAllPoints:sonPoints];
}
}];
} #pragma mark - TreeTableCellDelegate
-(void)cellClick:(Node *)node{
NSLog(@"%@----%ld-----%ld------%ld",node.name,node.parentId,(long)node.nodeId,(long)node.depth);
}
@end
说明：以后不论参数怎么变，不论是三级还是四级表格，都可以自动轻松实现
效果截图如下：
提示：自己先和后台商量好如何json数据格式如何返回，目的是方便自己整理