iOS仿京东分类菜单实例实现

2019-11-14 18:10:56

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在APP开发过程中此功能还是比较常见的模块，左边为菜单展示，右边为菜单下数据的展示，选择不同的菜单右边的数据源进行更新，此实例主要运用到UITableView，UICollectionView,OC谓词一些知识，结合Masonry进行布局；实现的效果如下：

涉及的知识点：

1：UITableView的运用，包含选中与非选中行不同展示，默认行分隔线的色彩跟与左边距离的调整，自动滚动到最顶端的实现等

2：UICollectionView的运用，包含单元格的加载，及重用时遇到的错乱问题，记录滚动位置的当前值；

3：数组的运用，包含运用谓词对数组过滤

一：左边表格单元行的实现内容

1.1 左边单元行的数据实体，(注意：offsetScorller是为了后面记录右边数据的滚动位置值)

#import <Foundation/Foundation.h>@interface leftTagModel : NSObject//ID值@PRoperty(assign,nonatomic)long tagID;//名称@property(copy,nonatomic)NSString *tagName;//图标地址（为后期可能带图标做准备）@property(copy,nonatomic)NSString *tagImageUrl;//这个来定位右边数据源滚动的位置@property(assign,nonatomic) float offsetScorller;@end

1.2左边单元行的创建(注意：关于行的背影色以及字体显示色彩的修改)

#import <UIKit/UIKit.h>#import "leftTagModel.h"@interface leftTableCell : UITableViewCell@property(strong,nonatomic)leftTagModel *curLeftTagModel;//是否被选中@property(assign,nonatomic)BOOL hasBeenSelected;@end

#import "leftTableCell.h"@interface leftTableCell()@property(strong,nonatomic)UIView *leftColorView;@property(strong,nonatomic)UILabel *nameLabel;@end//左边色彩条宽度static const CGFloat leftColorViewWidth=3;//文字字体大小static const CGFloat textFontSize=15;@implementation leftTableCell- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];    if (self) {        //设置背影色        self.backgroundColor=[UIColor grayColor];        self.accessoryType = UITableViewCellAccessoryNone;                if (self.leftColorView==nil) {            self.leftColorView=[[UIView alloc]init];            self.leftColorView.backgroundColor=[UIColor blueColor];            self.leftColorView.hidden=YES;            [self.contentView addSubview:self.leftColorView];            [self.leftColorView mas_makeConstraints:^(MASConstraintMaker *make) {                make.left.mas_equalTo(self.contentView.mas_left).with.offset(0);                make.top.mas_equalTo(self.contentView.mas_top).with.offset(0);                make.bottom.mas_equalTo(self.contentView.mas_bottom).with.offset(0);                make.width.mas_equalTo(leftColorViewWidth);            }];        }                if (self.nameLabel==nil) {            self.nameLabel=[[UILabel alloc]init];            self.nameLabel.font=[UIFont systemFontOfSize:textFontSize];            self.nameLabel.textAlignment=NSTextAlignmentCenter;            [self.nameLabel sizeToFit];            [self.contentView addSubview:self.nameLabel];            [self.nameLabel mas_makeConstraints:^(MASConstraintMaker *make) {                make.center.mas_equalTo(self.contentView);                make.height.mas_equalTo(@20);            }];        }    }    return self;}- (void)awakeFromNib {    // Initialization code}- (void)setSelected:(BOOL)selected animated:(BOOL)animated {    [super setSelected:selected animated:animated];    // Configure the view for the selected state}/** *  @author wujunyang, 15-10-10 14:10:52 * *  @brief  设置选中跟没有选中的变化 * *  @param hasBeenSelected 是否被选中 * *  @since <#version number#> */-(void)setHasBeenSelected:(BOOL)hasBeenSelected{    _hasBeenSelected=hasBeenSelected;    if (_hasBeenSelected) {        self.backgroundColor=[UIColor whiteColor];        self.nameLabel.textColor=[UIColor greenColor];        self.leftColorView.hidden=NO;    }    else    {        self.backgroundColor=[UIColor grayColor];        self.nameLabel.textColor=[UIColor blackColor];        self.leftColorView.hidden=YES;    }}-(void)setCurLeftTagModel:(leftTagModel *)curLeftTagModel{    _curLeftTagModel=curLeftTagModel;    self.nameLabel.text=_curLeftTagModel.tagName;}@end

二：右边列表的单元格实现

2.1右边单元格实体（注意tagID是为跟左边的数据源进行关联）

#import <Foundation/Foundation.h>@interface noHeadRightModel : NSObject//实体leftTageModel中的主键值@property(assign,nonatomic)long tagID;@property(assign,nonatomic)long roomID;@property(copy,nonatomic)NSString *roomName;@property(copy,nonatomic)NSString *roomImageUrl;@end

2.2单元格的实现

#import <UIKit/UIKit.h>#import "noHeadRightModel.h"@interface rightCollectionViewCell : UICollectionViewCell@property(strong,nonatomic)noHeadRightModel *curNoHeadRightModel;+(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)setCurNoHeadRightModel:(noHeadRightModel *)curNoHeadRightModel{    _curNoHeadRightModel=curNoHeadRightModel;    self.roomImageView.image=[UIImage imageNamed:_curNoHeadRightModel.roomImageUrl];    self.roomLabel.text=_curNoHeadRightModel.roomName;}+(CGSize)ccellSize{    return CGSizeMake(([UIScreen mainScreen].bounds.size.width-80-10*3)/3,collectionCellHeight);}@end

注意：在集合UICollectionView重用单元一直出现错乱，加载的数据有问题，是因为没有把布局放在- (id)initWithFrame:(CGRect)frame导致；

三：主页面的展示内容

3.1测试数据的构造跟左右两控件的初始化

#import "menuTableViewController.h"#define kScreenWidth [UIScreen mainScreen].bounds.size.width#define kScreenHeight [UIScreen mainScreen].bounds.size.height@interface menuTableViewController ()<UITableViewDataSource, UITableViewDelegate,UICollectionViewDataSource, UICollectionViewDelegate>@property (strong, nonatomic) UITableView *myTableView;//左边列表的数据源@property (nonatomic, strong) NSMutableArray *dataList;//右边列表的过滤数据源@property(nonatomic,strong)NSMutableArray *rightdataList;//右边列表数据源@property(nonatomic,strong)NSMutableArray *allRightDataList;//当前被选中的ID值@property(strong,nonatomic)leftTagModel *curSelectModel;//右边列表@property (strong, nonatomic) UICollectionView *myCollectionView;//是否保持右边滚动时位置@property(assign,nonatomic) BOOL isKeepScrollState;@property(assign,nonatomic) BOOL isReturnLastOffset;@property(assign,nonatomic) NSInteger selectIndex;@end//表格的宽度static const CGFloat tableWidthSize=80;//行的高度static const CGFloat tableCellHeight=44;//表格跟集合列表的空隙static const CGFloat leftMargin =10;@implementation menuTableViewController- (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<55; j++) {            noHeadRightModel *model=[[noHeadRightModel alloc]init];            model.tagID=i;            model.roomID=j;            model.roomName=[NSString stringWithFormat:@"%d层房%d",i,j];            model.roomImageUrl=[NSString stringWithFormat:@"room%d",j%5];            [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.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];    }}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];}

注意：isKeepScrollState是为了让右边是否记录下当前滚动位置，若不想则可以把它设置为NO，它便会自动滚动到Y为0的位置；上面的代码中还包含若列表有数据则默认选中第一个的实现功能，[self predicateDataSoure]则是实现的对数组进行过滤的操作，实用的OC谓词的方式；

/** *  @author wujunyang, 15-10-11 20:10:28 * *  @brief  过滤右边集合的数据 * *  @since <#version number#> */-(void)predicateDataSoure{    //过滤右边的集合数据    NSPredicate *pre=[NSPredicate predicateWithFormat:[NSString stringWithFormat:@"tagID=%ld",self.curSelectModel.tagID]];    self.rightdataList=[[self.allRightDataList filteredArrayUsingPredicate:pre] mutableCopy];    [self.myCollectionView reloadData];}

3.2表格中相应的UITableViewDataSource, UITableViewDelegate实现内容

#pragma mark UITableViewDataSource, UITableViewDelegate-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return self.dataList.count;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return 1;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    leftTableCell *cell = [tableView dequeueReusableCellWithIdentifier:NSStringFromClass([leftTableCell class]) forIndexPath:indexPath];    cell.curLeftTagModel = [self.dataList objectAtIndex:indexPath.section];    cell.hasBeenSelected = (cell.curLeftTagModel==self.curSelectModel);        //修改表格行默认分隔线存空隙的问题    if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {        cell.layoutMargins=UIEdgeInsetsZero;    }    if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {        cell.separatorInset=UIEdgeInsetsZero;    }        return cell;}- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{    return tableCellHeight;}- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    [tableView deselectRowAtIndexPath:indexPath animated:YES];        _selectIndex=indexPath.section;    self.curSelectModel=[self.dataList objectAtIndex:indexPath.section];    [self.myTableView reloadData];        [self predicateDataSoure];    //处理点击在滚动置顶的问题    [tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];        self.isReturnLastOffset=NO;    if (self.isKeepScrollState) {        [self.myCollectionView scrollRectToVisible:CGRectMake(0, self.curSelectModel.offsetScorller, self.myCollectionView.frame.size.width, self.myCollectionView.frame.size.height) animated:NO];    }    else{                [self.myCollectionView scrollRectToVisible:CGRectMake(0, 0, self.myCollectionView.frame.size.width, self.myCollectionView.frame.size.height) animated:NO];    }}

上面有两个知识点是关于表格默认分隔线距离左边的调整，把默认没有顶到左边的样式进行修改，另一个是关于点击时自动滚动到置顶的实现方式；

3.3集合列表的UICollectionViewDataSource, UICollectionViewDelegate实现

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{    return self.rightdataList.count;}- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{    rightCollectionViewCell *ccell = [collectionView dequeueReusableCellWithReuseIdentifier:NSStringFromClass([rightCollectionViewCell class]) forIndexPath:indexPath];    noHeadRightModel *model=[self.rightdataList objectAtIndex:indexPath.row];    ccell.curNoHeadRightModel=model;    return ccell;}- (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{    noHeadRightModel *model=[self.rightdataList objectAtIndex:indexPath.row];    NSLog(@"你选择的%@",model.roomName);}

3.4记录滚动的位置（右边列表的当前滚动位置记录下来，存在左边数据源的实体中，然后在左边的列表点击事件中进行判断）

#pragma mark---记录滑动的坐标(把右边滚动的Y值记录在列表的一个属性中)-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{    if ([scrollView isEqual:self.myCollectionView]) {        self.isReturnLastOffset=YES;    }}-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{    if ([scrollView isEqual:self.myCollectionView]) {        leftTagModel * item=self.dataList[self.selectIndex];        item.offsetScorller=scrollView.contentOffset.y;        self.isReturnLastOffset=NO;    }    }-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{    if ([scrollView isEqual:self.myCollectionView]) {        leftTagModel * item=self.dataList[self.selectIndex];        item.offsetScorller=scrollView.contentOffset.y;        self.isReturnLastOffset=NO;            }    }-(void)scrollViewDidScroll:(UIScrollView *)scrollView{    if ([scrollView isEqual:self.myCollectionView] && self.isReturnLastOffset) {        leftTagModel * item=self.dataList[self.selectIndex];        item.offsetScorller=scrollView.contentOffset.y;    }}