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:-1 nodeId:0 name:@"中国" depth:0 expand:YES]; Node *province1 = [[Node alloc] initWithParentId:0 nodeId:1 name:@"江苏" depth:1 expand:NO]; Node *city1 = [[Node alloc] initWithParentId:1 nodeId:2 name:@"南通" depth:2 expand:NO]; Node *city2 = [[Node alloc] initWithParentId:1 nodeId:3 name:@"南京" depth:2 expand:NO]; Node *city3 = [[Node alloc] initWithParentId:1 nodeId:4 name:@"苏州" depth:2 expand:NO]; Node *province2 = [[Node alloc] initWithParentId:0 nodeId:5 name:@"广东" depth:1 expand:NO]; Node *city4 = [[Node alloc] initWithParentId:5 nodeId:6 name:@"深圳" depth:2 expand:NO]; Node *city5 = [[Node alloc] initWithParentId:5 nodeId:7 name:@"广州" depth:2 expand:NO]; Node *province3 = [[Node alloc] initWithParentId:0 nodeId:8 name:@"浙江" depth:1 expand:NO]; Node *city6 = [[Node alloc] initWithParentId:8 nodeId:9 name:@"杭州" depth:2 expand:NO]; //----------------------------------美国的省地市关系图0,1,2-------------------------------------------- Node *country2 = [[Node alloc] initWithParentId:-1 nodeId:10 name:@"美国" depth:0 expand:YES]; Node *province4 = [[Node alloc] initWithParentId:10 nodeId:11 name:@"纽约州" depth:1 expand:NO]; Node *province5 = [[Node alloc] initWithParentId:10 nodeId:12 name:@"德州" depth:1 expand:NO]; Node *city7 = [[Node alloc] initWithParentId:12 nodeId:13 name:@"休斯顿" depth:2 expand:NO]; Node *province6 = [[Node alloc] initWithParentId:10 nodeId:14 name:@"加州" depth:1 expand:NO]; Node *city8 = [[Node alloc] initWithParentId:14 nodeId:15 name:@"洛杉矶" depth:2 expand:NO]; Node *city9 = [[Node alloc] initWithParentId:14 nodeId:16 name:@"旧金山" depth:2 expand:NO]; //----------------------------------日本的省地市关系图0,1,2-------------------------------------------- Node *country3 = [[Node alloc] initWithParentId:-1 nodeId:17 name:@"日本" depth:0 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：
2016-06-22 12:04:28.622 Point[1163:71939] { data = ( { id = 3067; knowid = 6582; name = "\U6570\U4e0e\U5f0f"; pid = 13; pidA = "0-2-13"; qNum = 123462; son = 1; son1 = ( { depth = 1; id = 3068; knowid = 6583; name = "\U6709\U7406\U6570"; pid = 6582; pidA = "0-2-13-6582"; qNum = 35487; son = 1; son1 = ( { depth = 2; id = 3069; knowid = 6584; name = "\U6709\U7406\U6570\U7684\U51e0\U4e2a\U6982\U5ff5"; pid = 6583; pidA = "0-2-13-6582-6583"; qNum = 14812; son = 1; son1 = ( { depth = 3; id = 3070; knowid = 6585; name = "\U6b63\U6570\U4e0e\U8d1f\U6570"; pid = 6584; pidA = "0-2-13-6582-6583-6584"; qNum = 2276; son = 0; url = "http://192.168.0.200//api.php/task1_2/taskadd1_2.html?id=6585&uid=12709"; },
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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"] = @"12709"; //用户id params[@"grade"] = @"0"; //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 = @"0"; 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(0, 20, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame)-20) 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:@"1"]) { 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
