Purchase购物车实例分析

源代码下载地址：http://code4app.com/ios/55655def933bf09d328b5141

此源代码从中学到以下四个知识点

第一：关于右边只有一个被选中的效果展现，左边部分代码内容，其是一个列表的形式，橙色为一个视图的效果，当没有被选中时则隐藏起来，这边默认第一个被选中；

单元格BADockCell.h

#import <UIKit/UIKit.h>
@interface BADockCell : UITableViewCell
@property (nonatomic ,weak) NSString *categoryText;
@property (nonatomic ,weak) UILabel *category;
@property (nonatomic ,weak) UIView *viewShow1;
+ (instancetype)cellWithTableView:(UITableView *)tableView;
@end

.m文件内容：

#import "BADockCell.h"
#import "Header.h"
@interface BADockCell ()
@end

@implementation BADockCell

-(id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self =[super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        UILabel *category =[[UILabel alloc]initWithFrame:(CGRect){,,,}];
        [self.contentView addSubview:category];
        _category=category;

        UIView *viewShow =[[UIView alloc]initWithFrame:(CGRect){,49.5,,0.5}];
        viewShow.backgroundColor=[UIColor blackColor];
        viewShow.alpha=0.4;
        [self.contentView addSubview:viewShow];
        UIView *viewShow1 =[[UIView alloc]initWithFrame:(CGRect){,,,}];
        viewShow1.backgroundColor=UIColorRGBA(, , , );
        [self.contentView addSubview:viewShow1];

        viewShow1.hidden=YES;
        _viewShow1=viewShow1;
    }
    return self;
}

-(void)setCategoryText:(NSString *)categoryText
{
    _category.text=categoryText;
    _category.textAlignment=NSTextAlignmentCenter;
    _category.font=Font();

}

+ (instancetype)cellWithTableView:(UITableView *)tableView
{
    static NSString *ID = @"BADockCell";
    BADockCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (cell == nil) {
        cell = [[BADockCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ID];
        //取消选中状态
        [cell setSelectionStyle:UITableViewCellSelectionStyleNone];
    }
    return cell;
}
@end

注意：+ (instancetype)cellWithTableView:(UITableView *)tableView在这边对CELL进行注册，然后在UITableView外面加载列时进行调用BADockCell *cell =[BADockCell cellWithTableView:tableView];

. h文件的内容（继承于UITableView）

#import <UIKit/UIKit.h>
@protocol DockTavleViewDelegate <NSObject>
-(void)dockClickindexPathRow:(NSMutableArray *)row  index:(NSIndexPath *)index indeXPath:(NSIndexPath *)indexPath;
@end

@interface BAWineShoppingDockTavleView : UITableView
@property (nonatomic ,strong) NSMutableArray *dockArray;
@property (weak ,nonatomic) id <DockTavleViewDelegate>dockDelegate;
@end

.m文件的内容

#import "BAWineShoppingDockTavleView.h"
#import "BADockCell.h"
#import "Header.h"
@interface BAWineShoppingDockTavleView ()<UITableViewDelegate,UITableViewDataSource>

@property (nonatomic ,strong) NSIndexPath *path;
@property (nonatomic ,assign) BOOL is;
@end

@implementation BAWineShoppingDockTavleView

-(id)initWithFrame:(CGRect)frame
{
    self =[super initWithFrame:frame];
    if (self) {
        self.dataSource=self;
        self.delegate=self;
    }
    return self;
}

-(void)layoutSubviews
{
    [super layoutSubviews];
    //只让它在初始化运行 运行一次_is就不为空了 给表格进行绑定
    if(!_is)
    {
        NSInteger selectedIndex = ;
        NSIndexPath *selectedIndexPath = [NSIndexPath indexPathForRow:selectedIndex inSection:];
        [self tableView:self didSelectRowAtIndexPath:selectedIndexPath];
        _is=YES;
    }
}

-(void)setDockArray:(NSMutableArray *)dockArray
{
    _dockArray=dockArray;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return _dockArray.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    //这样方式的加载内容不错
    BADockCell *cell =[BADockCell cellWithTableView:tableView];
    cell.categoryText=_dockArray[indexPath.row][@"dockName"];
    cell.backgroundColor=[UIColor whiteColor];
    return cell;
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (_path!=nil) {
        NSLog(@"上一个被选中%zd",_path.row);
        BADockCell *cell = (BADockCell *)[tableView cellForRowAtIndexPath:_path];
        cell.backgroundColor=[UIColor whiteColor];
        cell.category.textColor=[UIColor blackColor];
        cell.viewShow1.hidden=YES;
    }
    if ([_dockDelegate respondsToSelector:@selector(dockClickindexPathRow:  index: indeXPath:)]) {
        [_dockDelegate dockClickindexPathRow:_dockArray[indexPath.row][@"right"]  index:_path indeXPath:indexPath];
    }
    //取消选中颜色

    BADockCell *cell = (BADockCell *)[tableView cellForRowAtIndexPath:indexPath];
    cell.category.textColor=UIColorRGBA(, , , );
    cell.backgroundColor=UIColorRGBA(, , , );
    cell.viewShow1.hidden=NO;
    _path=indexPath;
    NSLog(@"选中%zd",_path.row);
}
@end

注意：对于_is变量只是用于第一次默认加载时，判断它并让其对第一个进行选中，最后进行赋值，这样就可以避免在表格绑定列时再进行判断的问题,而_path变量则是为了把选中的值赋给它，在didSelectRowAtIndexPath中一开始对它进行是否为空的判断，这样就可以清理掉上一次的选中；

第二：关于左边选中后右边进行更新，它还有一个效果是右边会刷新从顶部回到第一条，代码简单如下

@property (nonatomic ,strong) BAWineShoppingDockTavleView *dockTavleView;
@property (nonatomic ,strong) BARightTableView *rightTableView;
@property (nonatomic ,strong) NSMutableArray *dockArray;
@property (nonatomic ,strong) NSMutableArray *offsArray;

-(void)viewDidLoad
{
      BAWineShoppingDockTavleView *dockTavleView =[[BAWineShoppingDockTavleView alloc]initWithFrame:(CGRect){,,,kWindowHeight-}];
    dockTavleView.rowHeight=;
    dockTavleView.dockDelegate=self;
    dockTavleView.backgroundColor=UIColorRGBA(, , , );
    [dockTavleView setSeparatorStyle:UITableViewCellSeparatorStyleNone];
    [self.view addSubview:dockTavleView];
    _dockTavleView =dockTavleView;

    BARightTableView *rightTableView =[[BARightTableView alloc]initWithFrame:(CGRect){,,kWindowWidth-,kWindowHeight-}];
    rightTableView.rowHeight=;
    rightTableView.rightDelegate=self;
    rightTableView.backgroundColor=UIColorRGBA(, , , );
    [rightTableView setSeparatorStyle:UITableViewCellSeparatorStyleNone];
    [self.view addSubview:rightTableView];
    _rightTableView=rightTableView;
}

-(void)dockClickindexPathRow:(NSMutableArray *)array index:(NSIndexPath *)index indeXPath:(NSIndexPath *)indexPath
{
    [_rightTableView setContentOffset:_rightTableView.contentOffset animated:NO];
    _offsArray[index.row] =NSStringFromCGPoint(_rightTableView.contentOffset);
    _rightTableView.rightArray=array;
    [_rightTableView reloadData];
    CGPoint point=CGPointFromString([_offsArray objectAtIndex:indexPath.row]);
    [_rightTableView setContentOffset:point];
}

第三：关于右边列增加或减少数量时，下面部分变化则是运用的回调的方式实现；在单元列中定义的一个回调，在右边的表格上进行一个委托，然后在主页面上进行实现变化的内容；

右边列.h文件：

#import <UIKit/UIKit.h>

@interface BARightCell : UITableViewCell
@property (nonatomic ,strong) NSMutableDictionary *rightData;
+ (instancetype)cellWithTableView:(UITableView *)tableView;
@property (nonatomic , copy) void (^TapActionBlock)(NSInteger pageIndex ,NSInteger money ,NSString *key);
@end

右边列.m文件(主要代码)：

-(void)wineRightClick
{
    int NumberInt =[_wineQuantity.text intValue];
    if (NumberInt ==) {
        return;
    }
    ++NumberInt;

     _wineQuantity.text =[NSString stringWithFormat:@"%d",NumberInt];
    _rightData[@"Quantity"] = _wineQuantity.text;
    _TapActionBlock([ _rightData[@"Quantity"] integerValue],[_rightData[@"money"] integerValue] ,_rightData[@"ProductID"]);
}

-(void)wineLeftClick
{
    int NumberInt =[_wineQuantity.text intValue];
    if (NumberInt ==) {
        return;
    }
    --NumberInt;
    _wineQuantity.text =[NSString stringWithFormat:@"%d",NumberInt];
    _rightData[@"Quantity"] = _wineQuantity.text;
    _TapActionBlock([ _rightData[@"Quantity"] integerValue],[_rightData[@"money"] integerValue],_rightData[@"ProductID"]);
    if (NumberInt ==) {
        return;
    }

}

右边表格的.h：

@protocol RightTableViewDelegate <NSObject>
-(void)quantity:(NSInteger)quantity money:(NSInteger)money key:(NSString *)key;
@end
@interface BARightTableView : UITableView
@property (nonatomic ,strong) NSMutableArray *rightArray;
@property (nonatomic ,weak) id<RightTableViewDelegate>rightDelegate;
@end

右边表格的.m:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    BARightCell *cell =[BARightCell cellWithTableView:tableView];
    cell.TapActionBlock=^(NSInteger pageIndex ,NSInteger money,NSString *key){
        if ([self.rightDelegate respondsToSelector:@selector(quantity:money:key:)]) {
            [self.rightDelegate quantity:pageIndex money:money key:key];
        }
    };
    cell.backgroundColor=UIColorRGBA(, , , );
    cell.rightData=_rightArray[indexPath.row];
    return cell;
}

主页面实现在变化(rightTableView.rightDelegate=self)：

-(void)quantity:(NSInteger)quantity money:(NSInteger)money key:(NSString *)key
{
    NSInteger addend  =quantity *money;

    [_dic setObject:[NSString stringWithFormat:@"%ld",addend] forKey:key];
    //得到词典中所有KEY值
    NSEnumerator * enumeratorKey = [_dic keyEnumerator];
    //遍历所有KEY的值
    NSInteger total=;
    NSInteger totalSingularInt=;
    for (NSObject *object in enumeratorKey) {
        total+=[_dic[object] integerValue];
        if ([_dic[object] integerValue] !=) {
            totalSingularInt +=;
            _totalSingular.hidden=NO;
        }
    }
    if (totalSingularInt==) {
        _totalSingular.hidden=YES;
        _bottomLabel.backgroundColor=[UIColor lightGrayColor];
        _bottomLabel.userInteractionEnabled=NO;
        _bottomLabel.text=@"请选购";
    }else
    {
        _bottomLabel.backgroundColor=[UIColor clearColor];
        _bottomLabel.userInteractionEnabled=YES;
        _bottomLabel.text=@"去结算";
    }
    _totalSingular.text=[NSString stringWithFormat:@"%ld",totalSingularInt];
    _totalPrice.text=[NSString stringWithFormat:@"￥%ld",total];

}

第四：关于页面的圆角样式效果

BALabel *bottomLabel =[[BALabel alloc]initWithFrame:(CGRect){kWindowWidth--,/-/,,}];
    bottomLabel.text=@"请选购";
    bottomLabel.textColor=[UIColor whiteColor];
    bottomLabel.textAlignment=NSTextAlignmentCenter;
    bottomLabel.font=Font();
    bottomLabel.backgroundColor=[UIColor lightGrayColor];
    bottomLabel.layer.masksToBounds=YES;
    bottomLabel.layer.cornerRadius=;
    bottomLabel.layer.borderWidth = ;
    bottomLabel.userInteractionEnabled=NO;
    [bottomLabel addTarget:self action:@selector(bottomLabelClick) forControlEvents:BALabelControlEventTap];
    bottomLabel.layer.borderColor = [[UIColor whiteColor] CGColor];
    [bottomView addSubview:bottomLabel];