UITableView相当于Android里面的ListView,但功能却比ListView强大太多。

使用UITableView需要指定数据源和代理。

1.显示所有的行

遵守UITableViewDataSource协议,必须实现的方法有两个:

// 每一节里面有多少行
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
// 每行的View,这里是UITableViewCell
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

2.修改每行高度选中行

遵守UITableViewDelegate协议

// 选中某行
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
// 设置每行高度
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

3.编辑模式

UITableView设置编辑模式可以(滑动)删除、添加和移动每一行。只需要修改其属性editing

@property(nonatomic,getter=isEditing) BOOL editing;


需要实现的方法

// 删除需要实现方法
- (void) tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
// 移动需要实现的方法
- (void) tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath

4.性能优化

首先根据Identifier从可重用的队列中拿,如果没有再重新分配Cell的内存。

static NSString *ID =@"tableview";
UITableViewCell *cell = [tableViewdequeueReusableCellWithIdentifier:ID];
if (cell == nil) {
    cell= [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitlereuseIdentifier:ID];
}

5.例子

ios UIVIew可见_移动开发


模型类:

Shop.h

@interface Shop : NSObject
@property (nonatomic, copy) NSString *icon;
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *desc;
@property (nonatomic) BOOL isChecked;
+ (id)shopWithName:(NSString *)name icon:(NSString *)icon desc:(NSString *)desc;
@end

Shop.m

#import "Shop.h"
@implementation Shop
+ (id)shopWithName:(NSString *)name icon:(NSString *)icon desc:(NSString *)desc
{
    Shop *shop = [[Shop alloc] init];
    shop.icon = icon;
    shop.name = name;
    shop.desc = desc;
    return shop;
}
@end

自定义UITableViewCell

QhMyTableViewCell.h

@class Shop;
@interface QhMyTableViewCell : UITableViewCell
+ (QhMyTableViewCell *) myTableViewCell;
@property (weak, nonatomic) IBOutlet UIImageView *imageViews;
@property (weak, nonatomic) IBOutlet UILabel *title;
@property (weak, nonatomic) IBOutlet UILabel *desc;
@property (nonatomic) Shop * shop;
@end

QhMyTableViewCell.m

@implementation QhMyTableViewCell
+ (QhMyTableViewCell *) myTableViewCell
{
    NSArray * views = [[NSBundle mainBundle] loadNibNamed:@"cell" owner:nil options:nil];
    QhMyTableViewCell * view = views[0];
    return view;
}
#pragma  mark -重写set方法,设置数据
- (void)setShop:(Shop *)shop
{
    self.imageView.image = [UIImage imageNamed:[shop icon]];
    self.title.text = [shop name];
    self.desc.text = [shop desc];
}
@end


QhViewController.h

@interface QhViewController : UIViewController

@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *name;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *deleteIcon;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *allPick;

//删除/编辑/反选按按钮的动作
- (IBAction)remove:(UIBarButtonItem *)sender;
- (IBAction)edit:(UIBarButtonItem *)sender;
- (IBAction)allPickAction:(id)sender;

// 使用加载xib然后通过连线的方式找到子控件进行设置,file owner设置为该控制器类时的输出口
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UILabel *titles;
@property (weak, nonatomic) IBOutlet UILabel *descs;

@end



QhViewController.m

@interface QhViewController () <UITableViewDataSource,UITableViewDelegate>
{
    NSMutableArray * _shops;
    BOOL _flag;
}

@end

@implementation QhViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    _shops = [NSMutableArray array];
    Shop *shop1 = [Shop shopWithName:@"111" icon:@"001.png" desc:@"111,111,111"];
    Shop *shop2 = [Shop shopWithName:@"222" icon:@"002.png" desc:@"222,222,222"];
    Shop *shop3 = [Shop shopWithName:@"333" icon:@"003.png" desc:@"333,333,333"];
    Shop *shop4 = [Shop shopWithName:@"444" icon:@"004.png" desc:@"444,444,444"];
    Shop *shop5 = [Shop shopWithName:@"555" icon:@"005.png" desc:@"555,555,555"];
    Shop *shop6 = [Shop shopWithName:@"666" icon:@"006.png" desc:@"666,666,666"];
    Shop *shop7 = [Shop shopWithName:@"777" icon:@"007.png" desc:@"777,777,777"];
    Shop *shop8 = [Shop shopWithName:@"888" icon:@"008.png" desc:@"888,888,888"];
    Shop *shop9 = [Shop shopWithName:@"666" icon:@"006.png" desc:@"666,666,666"];
    Shop *shop10 = [Shop shopWithName:@"777" icon:@"007.png" desc:@"777,777,777"];
    Shop *shop11 = [Shop shopWithName:@"888" icon:@"008.png" desc:@"888,888,888"];
    Shop *shop12 = [Shop shopWithName:@"666" icon:@"006.png" desc:@"666,666,666"];
    Shop *shop13 = [Shop shopWithName:@"777" icon:@"007.png" desc:@"777,777,777"];
    Shop *shop14 = [Shop shopWithName:@"888" icon:@"008.png" desc:@"888,888,888"];
    [_shops addObjectsFromArray:@[shop1, shop2, shop3,shop4,shop5,shop6,shop7,shop8,shop9,shop10,shop11,shop12,shop13,shop14]];
}

//- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
//{
//    return  1;
//}

#pragma mark 每一节里面有多少行
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // 刷新数据时更改反选按钮的状态,没有数据时为不可选种状态
    if (_shops.count > 0) {
        [_allPick setEnabled:YES];
    }
    else
        [_allPick setEnabled:NO];
    // 记录选中的行数
    NSInteger i = 0;
    for (Shop * shop in _shops) {
        if (shop.isChecked) {
            i++;
        }
    }
    NSString * nameString;
    if (i>0) {
       nameString = [NSString stringWithFormat:@"已勾选(%d)",i];
    }else
    nameString = @"已勾选";
    self.name.title = nameString;
    // 只要有一行为选中状态就让删除按钮为可选状态
    _flag = NO;
    for (Shop * shop in _shops) {
        if (shop.isChecked) {
            _flag = YES;
        }
    }
    if (_flag) {
        [_deleteIcon setEnabled:YES];
    }else
        [_deleteIcon setEnabled:NO];
    return _shops.count;
    
}

#pragma mark- 每行显示的cell
#pragma mark 1表示使用系统自带的cell作为每一行的布局。
#pragma mark 2表示加载自定义的xib文件,然后通过顺序或者tag找到每个子控件赋值。
#pragma mark 3表示加载xib然后通过连线的方式找到子控件进行设置,file owner设置为控制器类。
#pragma mark  最终采用的方式是自定义UITableViewCell,将xib对应的类修改为自己的类,连线。fileowner设置为nil。
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *ID = @"tableview";
//1    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
     QhMyTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (cell == nil) {
//1        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
//2        NSArray * views = [[NSBundle mainBundle] loadNibNamed:@"cell" owner:nil options:nil];
//2        cell = views[0];
        
//3        NSArray * views = [[NSBundle mainBundle] loadNibNamed:@"cell" owner:self options:nil];
//3        cell = views[0];
        cell = [QhMyTableViewCell myTableViewCell];
    }
    NSLog(@"----->%p", cell);
//2    UIImageView * imageView = cell.contentView.subviews[0];
//2    UILabel * title = cell.contentView.subviews[1];
//2    UILabel * desc = cell.contentView.subviews[2];
//3    不需要,因为已经通过连线定义了输出口
    
    Shop * shop =  _shops[indexPath.row];
//1    cell.imageView.image = [UIImage imageNamed:shop.icon];
//1    cell.textLabel.text = [shop name];
//1    cell.detailTextLabel.text = [shop desc];
    
//2    imageView.image = [UIImage imageNamed:shop.icon];
//2    title.text = [shop name];
//2    desc.text = [shop desc];
    
//3    _imageView.image = [UIImage imageNamed:shop.icon];
//3    _titles.text = [shop name];
//3    _descs.text = [shop desc];
    
    [cell setShop:shop];
    if (shop.isChecked) {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
    }else
         cell.accessoryType = UITableViewCellAccessoryNone;
   return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 80;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger clickIndex = indexPath.row;
    Shop * shop = _shops[clickIndex];
    BOOL b = shop.isChecked;
    shop.isChecked = !b;
    [_tableView reloadData];
}

#pragma mark 删除按钮的动作
- (IBAction)remove:(UIBarButtonItem *)sender
{
    int i = 0;
    for (;i < _shops.count;) {
        Shop * shop = _shops[i];
        if (shop.isChecked) {
            [_shops removeObjectAtIndex:i];
            i = 0;
        }else i ++;
    }
    [_tableView reloadData];
}

#pragma mark 反选按钮的动作
- (IBAction)allPickAction:(id)sender {
    for (Shop * shop in _shops) {
        BOOL b = shop.isChecked;
        shop.isChecked = !b;
    }
    [_tableView reloadData];
}

#pragma mark 编辑按钮的动作
- (IBAction)edit:(UIBarButtonItem *)sender {
    //_tableView.editing = !self.tableView.editing;
    [_tableView setEditing:!self.tableView.editing animated:YES];
}

#pragma mark 删除对应的行  滑动删除的方法
- (void) tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    // 从数据源删除
    [_shops removeObjectAtIndex:indexPath.row];
    
    // 刷新数据
    [_tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationTop];
}

#pragma mark 编辑模式下移动行要实现的方法
- (void) tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath
{
    Shop * s = _shops[sourceIndexPath.row];
    // 先删除源
    [_shops removeObjectAtIndex:sourceIndexPath.row];
    // 再插入到目的
    [_shops insertObject:s atIndex:destinationIndexPath.row];
    // 刷新数据
}
@end

在- (NSInteger)tableView:(UITableView *)tableViewnumberOfRowsInSection:(NSInteger)section方法中的数字表示使用了四种方式达到相同的目的。方式2和Android里面的思路一致。最终采用的方式可以实现松耦合有利于代码以后的重新利用。

1表示使用系统自带的cell作为每一行的布局。

2表示加载自定义的xib文件,然后通过顺序或者tag找到每个子控件赋值。

3表示加载xib然后通过连线的方式找到子控件进行设置,file owner设置为控制器类。

最终采用的方式是自定义UITableViewCell,将xib对应的类修改为自己的类,连线。fileowner设置为nil。