第4课、UITableView专题（三）

#import <Foundation/Foundation.h>

@interface Product : NSObject

//标题
@property (strong, nonatomic) NSString * title;
//描述
@property (strong, nonatomic) NSString * desc;
//图片
@property (strong, nonatomic) NSString * imageName;


@end

#import <UIKit/UIKit.h>

@interface ViewController : UITableViewController<UIAlertViewDelegate>

@end

#import "ViewController.h"
#import "Product.h"

@interface ViewController ()

@property (strong, nonatomic) NSMutableArray * arrProducts;

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    
    //0. 数组初始化
    //实例化商品列表数组，如果能够准确知道数组容量的时候，不要用array直接实例化可变数组
    self.arrProducts = [NSMutableArray arrayWithCapacity:50];
    
    //1. 创建Model
    for (int i=0; i<50; i++)
    {
        Product * pro = [[Product alloc] init];
        pro.title = [NSString stringWithFormat:@"商品%i", i+1];
        pro.desc = @"描述商品信息";
        pro.imageName = [NSString stringWithFormat:@"00%i", arc4random_uniform(9)+1];
        
        //2. 添加到数组
        [self.arrProducts addObject:pro];
    }
    
}



#pragma mark - tableView dataSource

#pragma mark  分组数量

#pragma mark  每组行数
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:
    (NSInteger)section
{
    return self.arrProducts.count;
}


#pragma mark  每行内容
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell * cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:nil];
    
    Product * pro = self.arrProducts[indexPath.row];
    
    //1. cell标题
    cell.textLabel.text = pro.title;
    //2. cell图标
    cell.imageView.image = [UIImage imageNamed:pro.imageName];
    //3. cell详细信息
    cell.detailTextLabel.text = pro.desc;
    //4. cell右侧图标
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;   //箭头
    
    return cell;
}





#pragma mark TableView Delegate

//cell 高度
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 60;
}


#pragma mark 点击某一行
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    Product * pro = self.arrProducts[indexPath.row];
    
    UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"标题" message:@"我在学习TableView" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
    [alert setAlertViewStyle:UIAlertViewStylePlainTextInput];   //设置样式
    [[alert textFieldAtIndex:0] setText:pro.title];     //赋值
    [alert show];
}



#pragma mark - UIAlertView Delegate
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    //NSLog(@"%i", buttonIndex);
    if (!buttonIndex)    //取消
        return;
    
    //0. 获得修改
    NSString * stringTitle = [alertView textFieldAtIndex:0].text;
    //1. 修改model
    NSIndexPath * indexPath = [self.tableView indexPathForSelectedRow];
    Product * pro = self.arrProducts[indexPath.row];
    pro.title = stringTitle;
    
    //2. 刷新TableView
    
    //2.1 刷新全部数据，当数量庞大时，不合适。(无动画效果)
    //[self.tableView reloadData];
    
    //刷新局部（有动画效果）
    [self.tableView reloadRowsAtIndexPaths:[self.tableView indexPathsForSelectedRows] withRowAnimation:UITableViewRowAnimationFade];
    
    
}

@end