思路： collectionView如何将子类目录签入，可放置在footerView内，形成一种嵌入的错觉。 建立好模型可以更清晰的将数据对应放入。 1.先子类化一个view里面用于显示三级目录。 2
思路：
collectionView如何将子类目录签入，可放置在footerView内，形成一种嵌入的错觉。
建立好模型可以更清晰的将数据对应放入。
1.先子类化一个view里面用于显示三级目录。
2.在子类话一个collectionView下面用到就可以直接用了，子类一个cell。
#import <UIKit/UIKit.h>@interface ViewController : UIViewController@end#import "ViewController.h"#import "DataModel.h"#import "LXJCollectionView.h"@interface ViewController ()@property (nonatomic, strong)NSMutableArray * dataArr;@end@implementation ViewController-(NSMutableArray *)dataArr{ if (_dataArr == nil) { _dataArr = [[NSMutableArray alloc]init]; } return _dataArr;}- (void)viewDidLoad { [super viewDidLoad]; [self createModel];}- (void)createModel{ NSArray * image = @[@[@"image1",@"image2",@"image3"], @[@"image4",@"image5",@"image6"], @[@"image7",@"image8"]]; NSArray * title = @[@[@"项目一",@"项目二",@"项目三"], @[@"项目四",@"项目五",@"项目六"], @[@"项目七",@"项目八"]]; NSArray * bigTitle = @[@"大类一",@"大类二",@"大类三"]; NSArray * sonsServe = @[@[@[@"修电脑1",@"修洗衣机",@"理发",@"收垃圾",@"阿道夫",@"阿道夫",],@[@"修电脑2",@"修洗衣机",@"理发",@"收垃圾",@"阿道夫",@"阿道夫",@"修电脑bug",@"修洗衣机",@"理发",@"收垃圾",@"阿道夫",@"阿道夫"],@[@"修洗衣机3",@"理发",@"收垃圾",@"阿道夫",@"阿道夫",@"修电脑"]], @[@[@"理发1",@"收垃圾",@"阿道夫",@"阿道夫"],@[@"阿道夫2"],@[@"理发3"]], @[@[@"阿道夫1",@"修电脑",@"收垃圾",@"阿道夫"],@[@"修洗衣机2"],@[@"理发3"]]]; for (int i = 0; i < 3; i++) { DataModel * model = [[DataModel alloc]init]; model.ID = i; model.name = bigTitle[i]; for (int j = 0; j < [image[i] count]; j++) { DataModel * sonModel = [[DataModel alloc]init]; sonModel.name = title[i][j]; sonModel.ID = j; sonModel.imageName = image[i][j]; for (int h = 0; h < [sonsServe[i][j] count]; h++) { DataModel * grandSon = [[DataModel alloc]init]; grandSon.name = sonsServe[i][j][h]; grandSon.ID = h; [sonModel.sons addObject:grandSon]; } [model.sons addObject:sonModel]; } [self.dataArr addObject:model]; } LXJCollectionView * collectionView = [[LXJCollectionView alloc]initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height-64)]; collectionView.data = self.dataArr; [self.view addSubview:collectionView];}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>#import "JSONModel.h"@interface DataModel : JSONModel@property (nonatomic, assign)NSInteger ID;@property (nonatomic, copy)NSString * name;@property (nonatomic, strong)NSMutableArray * sons;@property (nonatomic, copy)NSString * imageName;@end#import "DataModel.h"@implementation DataModel-(NSMutableArray *)sons{ if (_sons == nil) { _sons = [[NSMutableArray alloc]init]; } return _sons;}//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>#import <UIKit/UIKit.h>@interface LXJCollectionView : UIView@property (nonatomic, strong)NSArray * data;@property (nonatomic, strong)NSArray * secondData;@end#define kSelfWidth self.frame.size.width#define kSelfHeight self.frame.size.height#import "LXJCollectionView.h"#import "LXJHomeCollectionViewCell.h"#import "DataModel.h"#import "SecondView.h"@interface LXJCollectionView ()<UICollectionViewDataSource,UICollectionViewDelegate>{ UICollectionView * _collectionView;}@property (nonatomic, strong)NSMutableDictionary * stateDic;@end@implementation LXJCollectionView- (instancetype)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { self.backgroundColor = [UIColor whiteColor]; [self createCollectionView]; } return self;}#pragma mark - create- (void)createCollectionView{ UICollectionViewFlowLayout * flowLayout = [[UICollectionViewFlowLayout alloc]init]; flowLayout.minimumInteritemSpacing = 0; flowLayout.minimumLineSpacing = 0; flowLayout.itemSize = CGSizeMake(kSelfWidth/3.0, kSelfWidth/3.0); _collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, kSelfWidth, kSelfHeight) collectionViewLayout:flowLayout]; _collectionView.delegate = self; _collectionView.dataSource = self; _collectionView.backgroundColor = [UIColor whiteColor]; [self addSubview:_collectionView]; //注册 [_collectionView registerClass:[LXJHomeCollectionViewCell class] forCellWithReuseIdentifier:@"cellID"]; [_collectionView registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"headerView"]; [_collectionView registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"footerView"]; //状态字典 需要用这个字典来记录点击的Cell它的二级目录对应的三级目录是开还是合 //并且记录每个section下的footerView是开还是合 //分开两张情况记录 是因为： //如果点击了section = 1,row = 1;后 section对应的footerview应该是张开的，而后在点击section = 1,row = 2;的时候 section对应的footer还是张开的 如果只记住了一种的话footerview就会合上 //所以需要记入section开合状态 并且seciton.row开合状态 最后将section.row的状态赋予section，不直接记录section.row是因为// - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section //这个方法最多只能拿到section 所以只能两个都记录 _stateDic = [[NSMutableDictionary alloc]init];}#pragma mark - UICollection DataSource-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{ NSString * cellID = @"cellID"; LXJHomeCollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellID forIndexPath:indexPath]; if (cell == nil) { cell = [[LXJHomeCollectionViewCell alloc]init]; } NSArray * arry = [_data[indexPath.section] sons]; DataModel * model = arry[indexPath.row]; cell.titleImage.image = [UIImage imageNamed:model.imageName]; cell.titleLabel.text = model.name; return cell;}-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{ DataModel * model = _data[section]; return model.sons.count;}-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{ return _data.count;}-(UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath{ UICollectionReusableView * headerView = nil; UICollectionReusableView * footerView = nil; if ([kind isEqualToString:UICollectionElementKindSectionHeader]) { headerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"headerView" forIndexPath:indexPath]; headerView.backgroundColor = [UIColor lightGrayColor]; [headerView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)]; UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(12, 0, kSelfWidth, 40)]; [headerView addSubview:label]; label.textColor = [UIColor darkTextColor]; label.font = [UIFont systemFontOfSize:14.0f]; label.textAlignment = NSTextAlignmentLeft; label.text = [_data[indexPath.section] name]; return headerView; }else if ([kind isEqualToString:UICollectionElementKindSectionFooter]) { footerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"footerView" forIndexPath:indexPath]; NSString *key = [NSString stringWithFormat:@"%ld",indexPath.section]; NSInteger createID = [[_stateDic valueForKey:key] integerValue]; [footerView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)]; if (createID == 1) { NSInteger lineNum = (_secondData.count+2)/3;//计算出行 加二是为了当数为4 7 这一类的数是计算出的结果为正确行数 SecondView * secondView = [[SecondView alloc]initWithFrame:CGRectMake(0, 0, kSelfWidth, 40*lineNum)]; [footerView addSubview:secondView]; secondView.secondData = _secondData; } return footerView; }else{ return nil; } }-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{ return CGSizeMake(kSelfWidth, 53);}- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section{ NSString *key = [NSString stringWithFormat:@"%ld",section]; NSInteger createID = [[_stateDic valueForKey:key] integerValue]; if (createID == 1) { NSInteger lineNum = (_secondData.count+2)/3; return CGSizeMake(kSelfWidth, 40*lineNum); } return CGSizeMake(0, 0);}- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{ NSArray * arry1 = [_data[indexPath.section] sons]; DataModel * model = arry1[indexPath.row]; _secondData = model.sons; NSString *key = [NSString stringWithFormat:@"%ld",indexPath.section]; //0合 1开 NSString * key1 = [NSString stringWithFormat:@"%ld",10000*(indexPath.section+1)+indexPath.row+1]; NSInteger createID = [[_stateDic valueForKey:key1] integerValue]; if (createID == 0) { createID = 1; }else{ createID = 0; } //将所有的footerview重新掷为闭合状态 NSArray * allKey = _stateDic.allKeys; for (int i = 0; i < allKey.count; i++) { [_stateDic setValue:@(0) forKey:allKey[i]]; } [_stateDic setValue:@(createID) forKeyPath:key1];//section.row 对应的开合状态 [_stateDic setValue:@(createID) forKey:key]; //section 对应的开合状态 [_collectionView reloadData];}- (void)setData:(NSArray *)data{ _data = data; [_collectionView reloadData];}@end//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>#import <UIKit/UIKit.h>@interface LXJHomeCollectionViewCell : UICollectionViewCell@property (nonatomic, strong)UIImageView * titleImage;@property (nonatomic, strong)UITextView * titleLabel;@end#import "LXJHomeCollectionViewCell.h"@implementation LXJHomeCollectionViewCell- (instancetype)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { self.backgroundColor = [UIColor whiteColor]; [self createContent]; } return self;}- (void)createContent{ float width = [UIScreen mainScreen].bounds.size.width; CGFloat gap = (width - 43.75*3)/6.0; _titleImage = [[UIImageView alloc]initWithFrame:CGRectMake(gap, 12, 43.75, 43.75)]; [self.contentView addSubview:_titleImage]; _titleLabel = [[UITextView alloc]initWithFrame:CGRectMake(5, CGRectGetMaxY(_titleImage.frame), width/3.0-10, 35)]; _titleLabel.editable = NO; _titleLabel.userInteractionEnabled = NO; _titleLabel.font = [UIFont systemFontOfSize:12.0f]; _titleLabel.textAlignment = NSTextAlignmentCenter; _titleLabel.textColor = [UIColor darkTextColor]; [self.contentView addSubview:_titleLabel];}@end//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>#import <UIKit/UIKit.h>@interface SecondView : UIView@property (nonatomic, strong)NSArray * secondData;@end#import "SecondView.h"#import "DataModel.h"#define kWidth self.frame.size.width#define kHeight self.frame.size.height@implementation SecondView- (void)setSecondData:(NSArray *)secondData{ _secondData = secondData; float btnWidth = kWidth/3.0; float btnHeight = 40; for (int i = 1; i <= secondData.count; i++) { DataModel * model = secondData[i-1]; NSInteger lineNum = (i+2)/3; UIButton * button = [[UIButton alloc]initWithFrame:CGRectMake(btnWidth*(i-1)- (lineNum-1)*kWidth,(lineNum-1) *btnHeight, btnWidth, btnHeight)]; [button setTitle:model.name forState:UIControlStateNormal]; [button.layer setBorderColor:[UIColor orangeColor].CGColor]; [button.layer setBorderWidth:0.5]; button.backgroundColor = [UIColor clearColor]; [button setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal]; button.layer.cornerRadius = 4; button.layer.masksToBounds = YES; [self addSubview:button]; }}@end
Demo :http://pan.baidu.com/s/1pLpgtCn
