先看界面效果圖:
主要實現了商品的展示,並且可以對商品進行多選操作,以及改變商品的購買數量。與此同時,計算出,選中的總價格。
做此類型項目:要注意的:視圖與數據要分離開來。視圖的展現來源是數據模型層。所以我做的操作就是改變數據層的內容,在根據數據內容,去更新視圖界面。
已下是具體實現思路與代碼:
1. 實現步驟
2. 代碼實現
2.1 完成界面的導航欄創建
在AppDelegate.m中包含ViewController.h頭文件,創建ViewController對象(vc),接著創建一個UINavigationController對象(nVC)將vc設置為自己的根視圖,最後設置self.window.rootViewController為nVC。
2.1.1 代碼
在AppDelegate.m的 - (BOOL)application:(UIApplication)application didFinishLaunchingWithOptions:(NSDictionary )launchOptions方法中實現以下代碼(記得包含#import "ViewController.h"):
//創建窗口 self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds]; self.window.backgroundColor = [UIColor whiteColor]; //創建一個導航控制器,成為根視圖 UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:[ViewController new]]; self.window.rootViewController = nav; //顯示窗口 [self.window makeKeyAndVisible];
在ViewController.m 的 viewDidLoad 中去設置,導航欄標題
self.title = @"購物車"; //設置標題的屬性樣式等 [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor blackColor],NSFontAttributeName:[UIFont systemFontOfSize:23.0f]}];
2.2 創建一個模型類用於存放數據模型
創建一個GoodsInfoModel 類 ,繼承於 NSObject
實現代碼如下: GoodsInfoModel.h 中
@interface GoodsInfoModel : NSObject @property(strong,nonatomic)NSString *imageName;//商品圖片 @property(strong,nonatomic)NSString *goodsTitle;//商品標題 @property(strong,nonatomic)NSString *goodsPrice;//商品單價 @property(assign,nonatomic)BOOL selectState;//是否選中狀態 @property(assign,nonatomic)int goodsNum;//商品個數 -(instancetype)initWithDict:(NSDictionary *)dict; @end GoodsInfoModel.m 中 -(instancetype)initWithDict:(NSDictionary *)dict { if (self = [super init]) { self.imageName = dict[@"imageName"]; self.goodsTitle = dict[@"goodsTitle"]; self.goodsPrice = dict[@"goodsPrice"]; self.goodsNum = [dict[@"goodsNum"]intValue]; self.selectState = [dict[@"selectState"]boolValue]; } return self; }
2.3 創建設置表格數據的數據
在ViewController.m中創建一個全局的可變數組,並往裡面添加表格需要的數據字典對象。
2.3.1 代碼
在ViewController.m的- (void)viewDidLoad中實現以下代碼(先在ViewController.m中聲明infoArr對象)。代碼如下
@interface ViewController ()<UITableViewDataSource,UITableViewDelegate,MyCustomCellDelegate> { UITableView *_MyTableView; float allPrice; NSMutableArray *infoArr; } @property(strong,nonatomic)UIButton *allSelectBtn; @property(strong,nonatomic)UILabel *allPriceLab; @end --------------------------------------------------------------- //初始化數據 allPrice = 0.0; infoArr = [[NSMutableArray alloc]init]; /** * 初始化一個數組,數組裡面放字典。字典裡面放的是單元格需要展示的數據 */ for (int i = 0; i<7; i++) { NSMutableDictionary *infoDict = [[NSMutableDictionary alloc]init]; [infoDict setValue:@"img6.png" forKey:@"imageName"]; [infoDict setValue:@"這是商品標題" forKey:@"goodsTitle"]; [infoDict setValue:@"2000" forKey:@"goodsPrice"]; [infoDict setValue:[NSNumber numberWithBool:NO] forKey:@"selectState"]; [infoDict setValue:[NSNumber numberWithInt:1] forKey:@"goodsNum"]; //封裝數據模型 GoodsInfoModel *goodsModel = [[GoodsInfoModel alloc]initWithDict:infoDict]; //將數據模型放入數組中 [infoArr addObject:goodsModel]; }
2.4 創建表格視圖
代碼如下:
/* 創建表格,並設置代理 / _MyTableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) style:UITableViewStylePlain]; _MyTableView.dataSource = self; _MyTableView.delegate = self; //給表格添加一個尾部視圖 _MyTableView.tableFooterView = [self creatFootView]; [self.view addSubview:_MyTableView];
2.5 創建尾部視圖
代碼如下:
/* * 創建表格尾部視圖 * * @return 返回一個UIView 對象視圖,作為表格尾部視圖/ -(UIView *)creatFootView{ UIView *footView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 150)]; //添加一個全選文本框標簽 UILabel *lab = [[UILabel alloc]initWithFrame:CGRectMake(self.view.frame.size.width - 150, 10, 50, 30)]; lab.text = @"全選"; [footView addSubview:lab]; //添加全選圖片按鈕 _allSelectBtn = [UIButton buttonWithType:UIButtonTypeCustom]; _allSelectBtn.frame = CGRectMake(self.view.frame.size.width- 100, 10, 30, 30); [_allSelectBtn setImage:[UIImage imageNamed:@"復選框-未選中"] forState:UIControlStateNormal]; [_allSelectBtn addTarget:self action:@selector(selectBtnClick:) forControlEvents:UIControlEventTouchUpInside]; [footView addSubview:_allSelectBtn]; //添加小結文本框 UILabel *lab2 = [[UILabel alloc]initWithFrame:CGRectMake(self.view.frame.size.width - 150, 40, 60, 30)]; lab2.textColor = [UIColor redColor]; lab2.text = @"小結:"; [footView addSubview:lab2]; //添加一個總價格文本框,用於顯示總價 _allPriceLab = [[UILabel alloc]initWithFrame:CGRectMake(self.view.frame.size.width - 100, 40, 100, 30)]; _allPriceLab.textColor = [UIColor redColor]; _allPriceLab.text = @"0.0"; [footView addSubview:_allPriceLab]; //添加一個結算按鈕 UIButton *settlementBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [settlementBtn setTitle:@"去結算" forState:UIControlStateNormal]; [settlementBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; settlementBtn.frame = CGRectMake(10, 80, self.view.frame.size.width - 20, 30); settlementBtn.backgroundColor = [UIColor blueColor]; [footView addSubview:settlementBtn]; return footView; }
2.6 創建自定義cell類,並實現初始化方法
創建一個類名叫MyCustomCell繼承UITableViewCell,在MyCustomCell.m中實現重寫的初始化方法。
2.6.1 代碼:
MyCustomCell.h :
#import <UIKit/UIKit.h> #import "GoodsInfoModel.h" //添加代理,用於按鈕加減的實現 @protocol MyCustomCellDelegate <NSObject> -(void)btnClick:(UITableViewCell *)cell andFlag:(int)flag; @end @interface MyCustomCell : UITableViewCell @property(strong,nonatomic)UIImageView *goodsImgV;//商品圖片 @property(strong,nonatomic)UILabel *goodsTitleLab;//商品標題 @property(strong,nonatomic)UILabel *priceTitleLab;//價格標簽 @property(strong,nonatomic)UILabel *priceLab;//具體價格 @property(strong,nonatomic)UILabel *goodsNumLab;//購買數量標簽 @property(strong,nonatomic)UILabel *numCountLab;//購買商品的數量 @property(strong,nonatomic)UIButton *addBtn;//添加商品數量 @property(strong,nonatomic)UIButton *deleteBtn;//刪除商品數量 @property(strong,nonatomic)UIButton *isSelectBtn;//是否選中按鈕 @property(strong,nonatomic)UIImageView *isSelectImg;//是否選中圖片 @property(assign,nonatomic)BOOL selectState;//選中狀態 @property(assign,nonatomic)id<MyCustomCellDelegate>delegate; //賦值 -(void)addTheValue:(GoodsInfoModel *)goodsModel; MyCustomCell.m :先寫一個宏定義寬度。#define WIDTH ([UIScreen mainScreen].bounds.size.width) -(instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier { if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) { //布局界面 UIView * bgView = [[UIView alloc]initWithFrame:CGRectMake(5, 5, WIDTH-10, 95)]; bgView.backgroundColor = [UIColor whiteColor]; //添加商品圖片 _goodsImgV = [[UIImageView alloc]initWithFrame:CGRectMake(5, 10, 80, 80)]; _goodsImgV.backgroundColor = [UIColor greenColor]; [bgView addSubview:_goodsImgV]; //添加商品標題 _goodsTitleLab = [[UILabel alloc]initWithFrame:CGRectMake(90, 5, 200, 30)]; _goodsTitleLab.text = @"afadsfa fa"; _goodsTitleLab.backgroundColor = [UIColor clearColor]; [bgView addSubview:_goodsTitleLab]; //促銷價 _priceTitleLab = [[UILabel alloc]initWithFrame:CGRectMake(90, 35, 70, 30)]; _priceTitleLab.text = @"促銷價:"; _priceTitleLab.backgroundColor = [UIColor clearColor]; [bgView addSubview:_priceTitleLab]; //商品價格 _priceLab = [[UILabel alloc]initWithFrame:CGRectMake(160, 35, 100, 30)]; _priceLab.text = @"1990"; _priceLab.textColor = [UIColor redColor]; [bgView addSubview:_priceLab]; //購買數量 _goodsNumLab = [[UILabel alloc]initWithFrame:CGRectMake(90, 65, 90, 30)]; _goodsNumLab.text = @"購買數量:"; [bgView addSubview:_goodsNumLab]; //減按鈕 _deleteBtn = [UIButton buttonWithType:UIButtonTypeCustom]; _deleteBtn.frame = CGRectMake(180, 65, 30, 30); [_deleteBtn setImage:[UIImage imageNamed:@"按鈕-.png"] forState:UIControlStateNormal]; [_deleteBtn addTarget:self action:@selector(deleteBtnAction:) forControlEvents:UIControlEventTouchUpInside]; _deleteBtn.tag = 11; [bgView addSubview:_deleteBtn]; //購買商品的數量 _numCountLab = [[UILabel alloc]initWithFrame:CGRectMake(210, 65, 50, 30)]; _numCountLab.textAlignment = NSTextAlignmentCenter; [bgView addSubview:_numCountLab]; //加按鈕 _addBtn = [UIButton buttonWithType:UIButtonTypeCustom]; _addBtn.frame = CGRectMake(260, 65, 30, 30); [_addBtn setImage:[UIImage imageNamed:@"按鈕+.png"] forState:UIControlStateNormal]; [_addBtn addTarget:self action:@selector(addBtnAction:) forControlEvents:UIControlEventTouchUpInside]; _addBtn.tag = 12; [bgView addSubview:_addBtn]; //是否選中圖片 _isSelectImg = [[UIImageView alloc]initWithFrame:CGRectMake(WIDTH - 50, 10, 30, 30)]; [bgView addSubview:_isSelectImg]; [self addSubview:bgView]; } return self; } /** * 給單元格賦值 * @param goodsModel 裡面存放各個控件需要的數值 */ -(void)addTheValue:(GoodsInfoModel *)goodsModel { _goodsImgV.image = [UIImage imageNamed:goodsModel.imageName]; _goodsTitleLab.text = goodsModel.goodsTitle; _priceLab.text = goodsModel.goodsPrice; _numCountLab.text = [NSString stringWithFormat:@"%d",goodsModel.goodsNum]; if (goodsModel.selectState) { _selectState = YES; _isSelectImg.image = [UIImage imageNamed:@"復選框-選中"]; }else{ _selectState = NO; _isSelectImg.image = [UIImage imageNamed:@"復選框-未選中"]; } } /** * 點擊減按鈕實現數量的減少 * * @param sender 減按鈕 */ -(void)deleteBtnAction:(UIButton *)sender { //判斷是否選中,選中才能點擊 if (_selectState == YES) { //調用代理 [self.delegate btnClick:self andFlag:(int)sender.tag]; } } /** * 點擊加按鈕實現數量的增加 * * @param sender 加按鈕 */ -(void)addBtnAction:(UIButton *)sender { //判斷是否選中,選中才能點擊 if (_selectState == YES) { //調用代理 [self.delegate btnClick:self andFlag:(int)sender.tag]; } }
2.7 實現表格的代理方法
//返回單元格個數 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection: (NSInteger)section { return infoArr.count; } //定制單元格內容 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *identify = @"indentify"; MyCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:identify]; if (!cell) { cell = [[MyCustomCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identify]; cell.delegate = self; } //調用方法,給單元格賦值 [cell addTheValue:infoArr[indexPath.row]]; return cell; } //返回單元格的高度 -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { return 120; } //單元格選中事件 -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { /** * 判斷當期是否為選中狀態,如果選中狀態點擊則更改成未選中,如果未選中點擊則更改成選中狀態 */ GoodsInfoModel *model = infoArr[indexPath.row]; if (model.selectState) { model.selectState = NO; } else { model.selectState = YES; } //刷新整個表格 // [_MyTableView reloadData]; //刷新當前行 [_MyTableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; [self totalPrice]; }
2.8 實現單元格加、減按鈕代理
先要再ViewController.m 中導入MyCustomCellDelegate 協議
@interface ViewController ()<UITableViewDataSource,UITableViewDelegate,MyCustomCellDelegate>
然後實現代碼如下:
#pragma mark -- 實現加減按鈕點擊代理事件 /** * 實現加減按鈕點擊代理事件 * * @param cell 當前單元格 * @param flag 按鈕標識,11 為減按鈕,12為加按鈕 */ -(void)btnClick:(UITableViewCell *)cell andFlag:(int)flag { NSIndexPath *index = [_MyTableView indexPathForCell:cell]; switch (flag) { case 11: { //做減法 //先獲取到當期行數據源內容,改變數據源內容,刷新表格 GoodsInfoModel *model = infoArr[index.row]; if (model.goodsNum > 1) { model.goodsNum --; } } break; case 12: { //做加法 GoodsInfoModel *model = infoArr[index.row]; model.goodsNum ++; } break; default: break; } //刷新表格 [_MyTableView reloadData]; //計算總價 [self totalPrice]; }
2.9 全選方法的實現
/** * 全選按鈕事件 * * @param sender 全選按鈕 */ -(void)selectBtnClick:(UIButton *)sender { //判斷是否選中,是改成否,否改成是,改變圖片狀態 sender.tag = !sender.tag; if (sender.tag) { [sender setImage:[UIImage imageNamed:@"復選框-選中.png"] forState:UIControlStateNormal]; }else{ [sender setImage:[UIImage imageNamed:@"復選框-未選中.png"] forState:UIControlStateNormal]; } //改變單元格選中狀態 for (int i=0; i<infoArr.count; i++) { GoodsInfoModel *model = [infoArr objectAtIndex:i]; model.selectState = sender.tag; } //計算價格 [self totalPrice]; //刷新表格 [_MyTableView reloadData]; }
2.10 計算總價格
#pragma mark -- 計算價格 -(void)totalPrice { //遍歷整個數據源,然後判斷如果是選中的商品,就計算價格(單價 * 商品數量) for ( int i =0; i<infoArr.count; i++) { GoodsInfoModel *model = [infoArr objectAtIndex:i]; if (model.selectState) { allPrice = allPrice + model.goodsNum *[model.goodsPrice intValue]; } } //給總價文本賦值 _allPriceLab.text = [NSString stringWithFormat:@"%.2f",allPrice]; NSLog(@"%f",allPrice); //每次算完要重置為0,因為每次的都是全部循環算一遍 allPrice = 0.0; }
短時間手寫:代碼比較粗糙,沒有完全整理;
源碼下載:http://xiazai.jb51.net/201612/yuanma/AndroidShoppingList(jb51.net).rar
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