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[操作系统]iOS仿京东分类菜单之UICollectionView内容


在上《iOS仿京东分类菜单实例实现》已经实现了大部分主体的功能,本文是针对右边集合列表进行修改扩展,使它达到分组的效果,本文涉及到的主要是UICollectionView的知识内容,左边列表的实现见上一篇文章,先看实现的效果图:

一:实体的创建

1.1分组实体的创建(tagID跟左边表格进行关联,roomArray是存放房间的数组,也就是单元格的集合)

#import <Foundation/Foundation.h>@interface rightModel : NSObject//实体leftTageModel中的主键值@property(assign,nonatomic)long tagID;@property(assign,nonatomic)long roomStyleID;@property(copy,nonatomic)NSString *roomStyleName;//房间实体headRightModel的数组@property(strong,nonatomic)NSMutableArray *roomArray;@end

1.2房间实体的创建

#import <Foundation/Foundation.h>@interface headRightModel : NSObject@property(assign,nonatomic)long roomID;@property(copy,nonatomic)NSString *roomName;@property(copy,nonatomic)NSString *roomImageUrl;@end

二:单元格的创建

#import <UIKit/UIKit.h>#import "headRightModel.h"@interface rightCollectionViewCell : UICollectionViewCell@property(strong,nonatomic)headRightModel *curHeadRightModel;+(CGSize)ccellSize;@end

#import "rightCollectionViewCell.h"@interface rightCollectionViewCell()@property(strong,nonatomic)UIImageView *roomImageView;@property(strong,nonatomic)UILabel *roomLabel;@endstatic const CGFloat collectionCellHeight=80;static const CGFloat labelHeight=20;@implementation rightCollectionViewCell//这边很关键 CollectionViewCell重用- (id)initWithFrame:(CGRect)frame{  self = [super initWithFrame:frame];  if (self) {    if (self.roomImageView==nil) {      self.roomImageView=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, ([UIScreen mainScreen].bounds.size.width-80-10*3)/3, collectionCellHeight-labelHeight)];      self.roomImageView.contentMode=UIViewContentModeScaleAspectFill;      self.roomImageView.clipsToBounds = YES;      self.roomImageView.layer.masksToBounds = YES;      self.roomImageView.layer.cornerRadius = 2.0;      [self.contentView addSubview:self.roomImageView];    }        if (self.roomLabel==nil) {      self.roomLabel=[[UILabel alloc]init];      self.roomLabel.font=[UIFont systemFontOfSize:15];      self.roomLabel.textAlignment=NSTextAlignmentCenter;      [self.roomLabel sizeToFit];      [self.contentView addSubview:self.roomLabel];      [self.roomLabel mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.mas_equalTo(self.roomImageView.mas_bottom).with.offset(2);        make.centerX.mas_equalTo(self.roomImageView).with.offset(0);        make.height.mas_equalTo(labelHeight);      }];    }  }  return self;}-(void)setCurHeadRightModel:(headRightModel *)curHeadRightModel{  _curHeadRightModel=curHeadRightModel;  self.roomImageView.image=[UIImage imageNamed:_curHeadRightModel.roomImageUrl];  self.roomLabel.text=_curHeadRightModel.roomName;}+(CGSize)ccellSize{  return CGSizeMake(([UIScreen mainScreen].bounds.size.width-80-10*3)/3,collectionCellHeight);}@end

三:创建节点显示视图

#import <UIKit/UIKit.h>@interface myHeadView : UICollectionReusableView- (void) setLabelText:(NSString *)text;@end

注意它是继承UICollectionReusableView

#import "myHeadView.h"@interface myHeadView()@property (strong, nonatomic) UILabel *label;@end@implementation myHeadView- (id)initWithFrame:(CGRect)frame{  self = [super initWithFrame:frame];  if (self)  {    self.label = [[UILabel alloc] init];    //在这边调整它的位置    self.label.frame=CGRectMake(0, 10, 250, 25);    self.label.font = [UIFont systemFontOfSize:18];    self.label.backgroundColor=[UIColor brownColor];    self.label.textColor=[UIColor yellowColor];    [self addSubview:self.label];  }  return self;}- (void) setLabelText:(NSString *)text{  self.label.text = text;}@end

四:创建测试数据跟初始化集合列表

- (void)viewDidLoad {  [super viewDidLoad];    //初始化  self.view.backgroundColor=[UIColor whiteColor];  self.dataList=[[NSMutableArray alloc]init];  self.rightdataList=[[NSMutableArray alloc]init];  self.allRightDataList=[[NSMutableArray alloc]init];  self.isReturnLastOffset=YES;  //是否允许右位保持滚动位置  self.isKeepScrollState=YES;  //测试数据  for (int i=0; i<10; i++) {        //左边列表数据    leftTagModel *item=[[leftTagModel alloc]init];    item.tagID=i;    item.tagName=[NSString stringWithFormat:@"第%d层",i];    [self.dataList addObject:item];        //右边列表数据    for (int j=0; j<10; j++) {      rightModel *model=[[rightModel alloc]init];      model.tagID=i;      model.roomStyleID=j;      model.roomStyleName=[NSString stringWithFormat:@"%d层类型%d",i,j];      NSMutableArray *headRightModelArray=[[NSMutableArray alloc]init];      for (int z=0; z<20; z++) {        headRightModel *headrightModel=[[headRightModel alloc]init];        headrightModel.roomID=z;        headrightModel.roomName=[NSString stringWithFormat:@"%d类房间%d",j,z];        headrightModel.roomImageUrl=[NSString stringWithFormat:@"room%d",z%5];        [headRightModelArray addObject:headrightModel];      }      model.roomArray=headRightModelArray;      [self.allRightDataList addObject:model];    }  }    //创建列表  if (!_myTableView) {    _myTableView = [[UITableView alloc] initWithFrame:CGRectMake(0,0,tableWidthSize, kScreenHeight) style:UITableViewStylePlain];    _myTableView.backgroundColor=[UIColor grayColor];    _myTableView.showsVerticalScrollIndicator = NO;    _myTableView.showsHorizontalScrollIndicator=NO;    _myTableView.dataSource = self;    _myTableView.delegate = self;    _myTableView.tableFooterView=[[UIView alloc]init];    _myTableView.separatorColor= [UIColor colorWithRed:52.0f/255.0f green:53.0f/255.0f blue:61.0f/255.0f alpha:1];    [_myTableView registerClass:[leftTableCell class] forCellReuseIdentifier:NSStringFromClass([leftTableCell class])];    if ([self.myTableView respondsToSelector:@selector(setLayoutMargins:)]) {      self.myTableView.layoutMargins=UIEdgeInsetsZero;    }    if ([self.myTableView respondsToSelector:@selector(setSeparatorInset:)]) {      self.myTableView.separatorInset=UIEdgeInsetsZero;    }    [self.view addSubview:_myTableView];  }    //创建集合表格  if (!_myCollectionView) {    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];    self.myCollectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(tableWidthSize+leftMargin,64, kScreenWidth-tableWidthSize-2*leftMargin, kScreenHeight) collectionViewLayout:layout];    self.myCollectionView.backgroundColor=[UIColor whiteColor];    self.myCollectionView.showsHorizontalScrollIndicator=NO;    self.myCollectionView.showsVerticalScrollIndicator=NO;    [self.myCollectionView registerClass:[rightCollectionViewCell class] forCellWithReuseIdentifier:NSStringFromClass([rightCollectionViewCell class])];    [self.myCollectionView registerClass:[myHeadView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:NSStringFromClass([myHeadView class])];    self.myCollectionView.dataSource = self;    self.myCollectionView.delegate = self;    [self.view addSubview:self.myCollectionView];  }    self.selectIndex=0;  //默认选择第一个  if (self.dataList.count>0) {    self.curSelectModel=[self.dataList objectAtIndex:self.selectIndex];    [self.myTableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:self.selectIndex inSection:0] animated:YES scrollPosition:UITableViewScrollPositionTop];    [self.myTableView reloadData];        //右边数据加载    [self predicateDataSoure];  }}

注意:关于节视图的注册

[self.myCollectionView registerClass:[myHeadView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:NSStringFromClass([myHeadView class])];

五:集合视图UICollectionViewDataSource, UICollectionViewDelegate的内容

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{  return self.rightdataList.count;}- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{  rightModel * array=self.rightdataList[section];    if (array.roomArray.count==0) {    return 1;  }  else  {    return array.roomArray.count;  }}- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{  rightCollectionViewCell *ccell = [collectionView dequeueReusableCellWithReuseIdentifier:NSStringFromClass([rightCollectionViewCell class]) forIndexPath:indexPath];  rightModel * array=self.rightdataList[indexPath.section];  headRightModel *model=[array.roomArray objectAtIndex:indexPath.row];  ccell.curHeadRightModel=model;  return ccell;}-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{  CGSize size = {240,40};  return size;}- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath{    myHeadView *headView;  rightModel * array=self.rightdataList[indexPath.section];  if([kind isEqual:UICollectionElementKindSectionHeader])  {    headView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:NSStringFromClass([myHeadView class]) forIndexPath:indexPath];    //别在这对headView坐标做处理    [headView setLabelText:[NSString stringWithFormat:@"%@",array.roomStyleName]];  }    return headView;}- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{  return [rightCollectionViewCell ccellSize];}- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{  return UIEdgeInsetsZero;}- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section{  return 5;}- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section{  return 5;}- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{}

注意:别在viewForSupplementaryElementOfKind,对myHeadView进行坐标的调整,因为它是全局的,会导致所有的节点都混在一起,记得设置它的节头大小,才会显示出来;

 

 六:扩展关于viewForSupplementaryElementOfKind,它可以设置节头跟节脚,下面引用网上一个比较全的说明

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath为collection view添加一个补充视图(页眉或页脚)- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section设定页眉的尺寸- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section设定页脚的尺寸- (void)registerClass:(Class)viewClass forSupplementaryViewOfKind:(NSString *)elementKind withReuseIdentifier:(NSString *)identifier

视图创建:

[self.myCollectionView registerClass:[MyHeadView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"hxwHeader"];[self.myCollectionView registerClass:[MyHeadView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"hxwHeader"];-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{  CGSize size = {240,25};  return size;}-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section{  CGSize size = {240,25};  return size;}- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath{  MyHeadView *headView;    if([kind isEqual:UICollectionElementKindSectionHeader])  {     headView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"hxwHeader" forIndexPath:indexPath];    [headView setLabelText:[NSString stringWithFormat:@"section %d's header",indexPath.section]];  }  else if([kind isEqual:UICollectionElementKindSectionFooter])  {    headView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"hxwHeader" forIndexPath:indexPath];    [headView setLabelText:[NSString stringWithFormat:@"section %d's footer",indexPath.section]];  }  return headView;}

 

 实例源代码下载地址