tableView编辑

tableView编辑

 

    tableView编辑的步骤

    1.创建按钮, 用于触发编辑

    2.指定哪些可以进行编辑(dataSource方法, 可选)

    3.指定编辑样式(删除或添加, delegate的方法, 可选, 默认删除)

    4.编辑完成方法中, 进行删除或添加(dataSource的方法, 先删数据, 再删cell)

   self.editButtonItem是系统封装好的按钮, 可以做edit和done的切换, 这个按钮关联的方法为setEditing:animated:
    self.navigationItem.rightBarButtonItem = self.editButtonItem;

    tableview的移动的步骤

    1.创建按钮, 用于触发编辑

    2.指定那些行可以移动(dataSource方法, 可选)

    3.移动完成(dataSource的方法)

    4.限制移动(delegate的方法)

- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
    [super setEditing:editing animated:animated];
    NSLog(@"%s", __FUNCTION__);
    editing, 判断当前是否在编辑
    NSLog(@"%d", editing);
    让tableView进入编辑状态
    UITableView *tableView = (UITableView *)[self.view viewWithTag:1029];
    [tableView setEditing:editing animated:YES];
    
}
- (void)createData {
    Animal *animal1 = [Animal animalWithName:@"咪咪" type:@"🐱"gender:@"母"];
    Animal *animal2 = [Animal animalWithName:@"肖恩" type:@"🐑"gender:@"公"];
    Animal *animal3 = [Animal animalWithName:@"舒克" type:@"🐭"gender:@"公"];
    Animal *animal4 = [Animal animalWithName:@"灰太狼" type:@"🐺"gender:@"公"];
    Animal *animal5 = [Animal animalWithName:@"熊大" type:@"🐻"gender:@"公"];
    Animal *animal6 = [Animal animalWithName:@"阿狸" type:@"🐯"gender:@"母"];
    Animal *animal7 = [Animal animalWithName:@"塞文" type:@"👾"gender:@"男"];
    
    self.animalArray = [@[animal1, animal2, animal3, animal4, animal5, animal6, animal7] mutableCopy];
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - UITableViewDataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return _animalArray.count + 1;
}

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *string = @"OK";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:string];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:(UITableViewCellStyleSubtitle) reuseIdentifier:string] autorelease];
    }
    if (indexPath.row == self.animalArray.count) {
        cell.textLabel.text = @"添加一个动物";
        cell.imageView.image = nil;
        cell.detailTextLabel.text = @"";
    } else {
        Animal *animal = _animalArray[indexPath.row];
        cell.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"%@.jpg", animal.name]];
        cell.textLabel.text = animal.name;
        cell.detailTextLabel.text = animal.type;
    }
    return cell;
}

控制tableView的哪些可以进行编辑, 默认所有行都可以进行编辑
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
//    if (indexPath.row == 0) {
//        return NO;
//    }
    return YES;
}

完成编辑
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        删除操作
        1.删除数据源中的数据
        [self.animalArray removeObjectAtIndex:indexPath.row];
        2.1 重新加载tableView(效率比较低)
//        [tableView reloadData];
        2.2 删除某行cell
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:(UITableViewRowAnimationAutomatic)];
    }
    if (editingStyle == UITableViewCellEditingStyleInsert) {
        添加操作
       1.添加数据
        Animal *animal = [Animal animalWithName:@"图图" type:@"🐰" gender:@"母"];
        [self.animalArray insertObject:animal atIndex:2];2.1重新加载tableView
//        [tableView reloadData];
        2.2 插入cell
        定义cell位置
        NSIndexPath *index = [NSIndexPath indexPathForRow:2 inSection:0];
        插入cell(cell的位置必须和添加数据的位置, 保持一致)
        [tableView insertRowsAtIndexPaths:@[index] withRowAnimation:(UITableViewRowAnimationLeft)];
    }
        
}

控制tableView的哪一行可以移动
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.row == self.animalArray.count) {
        return NO;
    }
    return YES;
}

完成移动
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath {
//    NSLog(@"起点: %ld 终点: %ld", sourceIndexPath.row, destinationIndexPath.row);
    数据处理
    1.保留原数据
    Animal *animal = [self.animalArray[sourceIndexPath.row] retain];
    2.删除数据源中的数据
    [self.animalArray removeObjectAtIndex:sourceIndexPath.row];
    3.插入数据
    [self.animalArray insertObject:animal atIndex:destinationIndexPath.row];
    4.释放保留的数据
    [animal release];
}

#pragma mark - UITableViewDelegate

控制tableView的每一行的编辑样式(insert 或 delete)
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.row == self.animalArray.count) {
        return UITableViewCellEditingStyleInsert;
    }
    return UITableViewCellEditingStyleDelete;
}


- (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath {
    判断是否是第一行或者是最后一行
    if (proposedDestinationIndexPath.row == 0 || proposedDestinationIndexPath.row == self.animalArray.count) {
        //如果是, 返回原来位置
        return sourceIndexPath;
    } else {
        如果不是, 返回终点位置
        return proposedDestinationIndexPath;
    }
}

Animal.m
#import "Animal.h"
@implementation Animal
- (void)dealloc {
    [_name release];
    [_type release];
    [_gender release];
    [super dealloc];
}
- (instancetype)initWithName:(NSString *)name type:(NSString *)type gender:(NSString *)gender {
    if (self = [super init]) {
        self.name = name;
        self.type = type;
        self.gender = gender;
    }
    return self;
}
+ (instancetype)animalWithName:(NSString *)name type:(NSString *)type gender:(NSString *)gender {
    return [[[Animal alloc] initWithName:name type:type gender:gender] autorelease];
}
- (NSString *)description
{
    return [NSString stringWithFormat:@"name: %@ type: %@ gender: %@", _name, _type, _gender];
}
@end

    UITableViewController, 继承于UIViewControl, 自带一个UITableView

    UITableViewController的优势

    1.不需要再创建UITableView

    2.不需要指定delegate和dataSource, 也不需要遵守<UITableViewDelegate,UITableViewDataSource>

#import "RootTableViewController.h"

@interface RootTableViewController ()

@end

@implementation RootTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.tableView.rowHeight = 100;
    self.navigationItem.rightBarButtonItem = self.editButtonItem;
    //是否支持多选, 默认为NO
    self.tableView.allowsMultipleSelection = YES;
    
   }

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - UITableviewdatasource
//分区个数
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 3;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 10;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
   static NSString *identifier = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableHeaderFooterViewWithIdentifier:identifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:(UITableViewCellStyleSubtitle) reuseIdentifier:identifier] autorelease];
    }
    cell.textLabel.text = @"Hello";
    return cell;
}

// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return NO if you do not want the specified item to be editable. 
    return YES;
}

// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    } else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}

// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}

// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}

#pragma mark - UITableViewDelegate
//行高, cell高度不一致
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.row % 2 == 1) {
        return 50;
    } else {
        return 100;
    }
}
//区头高度
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
    return 60;
}

//区尾高度
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {
    return 0;
}

//自定义区头视图
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tu.jpg"]];
//    imageView.contentMode = UIViewContentModeScaleAspectFit;
    return imageView;
}

- (UITableViewCellAccessoryType)tableView:(UITableView *)tableView accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.row % 2 == 1) {
        return UITableViewCellAccessoryDetailButton;
    } else {
        return UITableViewCellAccessoryCheckmark;
    }
}

//点击了哪个附加视图的代码
- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"%ld, %ld", indexPath.section, indexPath.row);
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"选中%ld行", indexPath.row);
}

- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath {
     NSLog(@"取消了%ld行", indexPath.row);
}

//设置删除按钮名称
- (NSString *)tableView:(UITableView *)tableView titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath  {
    return @"OK";
}

- (NSArray *)tableView:(UITableView *)tableView editActionsForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewRowAction *action1 = [UITableViewRowAction rowActionWithStyle:(UITableViewRowActionStyleDefault) title:@"收藏" handler:^(UITableViewRowAction *action, NSIndexPath *indexPath){
        NSLog(@"已经收藏");
    }];
    
    UITableViewRowAction *action2 = [UITableViewRowAction rowActionWithStyle:(UITableViewRowActionStyleNormal) title:@"分享" handler:^(UITableViewRowAction *action, NSIndexPath *indexPath){
        NSLog(@"已经分享");
    }];
    return @[action1, action2];
}
@end