ios开发-UISlider通过滑动添加单元格功能

#import   "XHViewController.h"

@interface   XHViewController   ()

@end

@implementation   XHViewController
{
      //用来记录上一次记录的值
      CGFloat   oldValue;
      //用来判断是添加还是删除
      BOOL     isInserted;
}

- ( void )awakeFromNib
{
    [ super   awakeFromNib ];
      //创建存储空间对象
      self . charList   = [[ NSMutableArray   alloc ]   init ];
      //设置默认的值是负数
      oldValue   = - 1 ;
}

- ( void )viewDidLoad
{
    [ super   viewDidLoad ];
// Do any additional setup after loading the view, typically from a nib.
}

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

- ( NSInteger )tableView:( UITableView   *)tableView numberOfRowsInSection:( NSInteger )section
{
      return   self . charList . count ;
}
-( UITableViewCell   *)tableView:( UITableView   *)tableView cellForRowAtIndexPath:( NSIndexPath   *)indexPath
{
      UITableViewCell   *cell = [tableView   dequeueReusableCellWithIdentifier : @"charlistcell"   forIndexPath :indexPath ];
   
    cell. textLabel . text   =   self . charList [indexPath. row ];
   
      return   cell;
}
- ( IBAction )didClickSlider:( UISlider   *)sender
{
      NSInteger   oldInt = ( NSInteger )( oldValue   / sender. maximumValue   *   26 );
      NSInteger   currentInt = ( NSInteger )(sender. value   / sender. maximumValue   *   26 );
   
    oldInt = oldInt <   0   ?   0   : oldInt;
   
      //
      NSMutableArray   *indexPathList = [[ NSMutableArray   alloc ]   init ];
      NSMutableArray   *charList = [[ NSMutableArray   alloc ]   init ];
   
      if   ( oldValue   < sender. value )
    {
          for   ( NSInteger   row = oldInt; row < currentInt; row++)
        {
              NSIndexPath   *indexPath = [ NSIndexPath   indexPathForRow :row   inSection : 0 ];
              NSString     *indexString = [[ NSString   alloc ]   initWithFormat : @"%c" , 'A'   + row];
              if   ([ self . charList   containsObject :indexString]) {
                  continue ;
            }
            [indexPathList    addObject :indexPath];
            [charList         addObject :indexString];
        }
       
       
        [ self . tableView   beginUpdates ];
        [ self . charList     addObjectsFromArray :charList];
        [ self . tableView   insertRowsAtIndexPaths :indexPathList   withRowAnimation : UITableViewRowAnimationAutomatic ];
        [ self . tableView   endUpdates ];
    }
   
      if   (sender. value   <   oldValue ) {
          for   ( NSInteger   row = currentInt; row < oldInt; row++)
        {
              NSIndexPath   *indexPath = [ NSIndexPath   indexPathForRow :row   inSection : 0 ];
              NSString     *indexString = [ self . charList   objectAtIndex :row];
              if   ([charList   containsObject :indexString])
            {
                  continue ;
            }
            [indexPathList    addObject :indexPath];
            [charList         addObject :indexString];
        }

        [ self . tableView   beginUpdates ];
        [ self . charList     removeObjectsInArray :charList];
        [ self . tableView   deleteRowsAtIndexPaths :indexPathList    withRowAnimation : UITableViewRowAnimationAutomatic ];
        [ self . tableView   endUpdates ];
    }
   
      oldValue   = sender. value ;
}


@end

#import  "MYYViewController.h"

@interface  MYYViewController  ()

@end

@implementation  MYYViewController
-( void )awakeFromNib{
    [ super  awakeFromNib ];
   
     self . charList  = [[ NSMutableArray    alloc ]  init ];
   

   
}
- ( void )viewDidLoad
{
    [ super  viewDidLoad ];
// Do any additional setup after loading the view, typically from a nib.
   
    [ self . charList  addObject : @"A" ];
    [ self . charList  addObject : @"B" ];
    [ self . charList  addObject : @"C" ];
    [ self . charList  addObject : @"D" ];
    [ self . charList  addObject : @"E" ];
    [ self . charList  addObject : @"F" ];
    [ self . charList  addObject : @"G" ];
    [ self . charList  addObject : @"H" ];
    [ self . charList  addObject : @"I" ];
    [ self . charList  addObject : @"J" ];

}

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

-( IBAction )didclickRightItem:( UIBarButtonItem  *)sender;
{
 
     if  (sender ==  self . editItem ) {

        [ self . tableView  setEditing : YES  animated : YES ];
        [ self . navigationItem    setRightBarButtonItem : self . doneItem  animated : YES ];
    } else {
        [ self . tableView  setEditing : NO  animated : YES ];
        [ self . navigationItem  setRightBarButtonItem : self . editItem  animated : YES ];
    }
   
   
   
   
}
- ( NSInteger )tableView:( UITableView  *)tableView numberOfRowsInSection:( NSInteger )section{
   
     return  self . charList . count ;
   
}



- ( UITableViewCell  *)tableView:( UITableView  *)tableView cellForRowAtIndexPath:( NSIndexPath  *)indexPath{
     //当storyboard  中或者xib中的tableView 上拖拽了一个模板单元格，可以直接使用这个方法来获取一个单元格对象
     UITableViewCell   *cell = [tableView  dequeueReusableCellWithIdentifier : @"detailviewcontroller_listcell"  forIndexPath :indexPath];
     //到底是使用section还是row  注意一下
    cell. textLabel . text  =  self . charList [indexPath. row ];
     return  cell;
}




//用来指定indexPath是否可以进行编辑
-( BOOL )tableView:( UITableView  *)tableView canEditRowAtIndexPath:( NSIndexPath  *)indexPath{
     //指定第一行不可以编辑
     return  !(indexPath. row  ==  0 );
   
}


//点击处于编辑状态的删除操作，触发这个方法
-( void )tableView:( UITableView  *)tableView commitEditingStyle:( UITableViewCellEditingStyle )editingStyle forRowAtIndexPath:( NSIndexPath  *)indexPath{
     switch  (editingStyle) {
             //默认都是删除动作
         case  UITableViewCellEditingStyleDelete :{
             //下面四行是删除的动作
           
           
           
             //开始更新表格视图
            [ self . tableView  beginUpdates ];
             //编辑数据源
            [ self . charList  removeObjectAtIndex :indexPath. row ];
           
             //指定视图的编辑状态（删除）
            [ self . tableView  deleteRowsAtIndexPaths : @[ indexPath ]  withRowAnimation : 0 ];
           
             //结束更新视图
            [ self . tableView  endUpdates ];
             break ;
        }
         case  UITableViewCellEditingStyleInsert :
        {
           
           
             //开始更新表格视图
            [ self . tableView  beginUpdates ];
             //编辑数据源
            [ self . charList    insertObject : @(0) . description  atIndex : 0  ];
           
             //zhi
             NSIndexPath  *zIndexPath  =  [ NSIndexPath    indexPathForItem : 0  inSection : 0 ];
             //指定视图的编辑状态(添加)
            [ self . tableView  insertRowsAtIndexPaths : @[ zIndexPath ]  withRowAnimation : 100 ];
           
             //结束更新视图
            [ self . tableView  endUpdates ];
             break ;

        }
           default :
             break ;
    }
}


//指定第二行添加
-( UITableViewCellEditingStyle )tableView:( UITableView  *)tableView editingStyleForRowAtIndexPath:( NSIndexPath  *)indexPath{
     return   indexPath. row  ==  1 ?
     UITableViewCellEditingStyleInsert :
     UITableViewCellEditingStyleDelete ;
}


//----------------------------------------------------------------------------------------------------------------------------------
//指定那些单元格可以移动
-( BOOL )tableView:( UITableView  *)tableView canMoveRowAtIndexPath:( NSIndexPath  *)indexPath{
//    每一行都可以移动
     return  YES ;
//    return !(indexPath.row == 0);
   
}
//将单元格移动到对应的单元格
- ( void )tableView:( UITableView  *)tableView moveRowAtIndexPath:( NSIndexPath  *)sourceIndexPath toIndexPath:( NSIndexPath  *)destinationIndexPath{
    //交换
    [ self . charList  exchangeObjectAtIndex :sourceIndexPath. row  withObjectAtIndex :destinationIndexPath. row ];
   
}

//可以修该默认的目标
-( NSIndexPath  *)tableView:( UITableView  *)tableView targetIndexPathForMoveFromRowAtIndexPath:( NSIndexPath  *)sourceIndexPath toProposedIndexPath:( NSIndexPath  *)proposedDestinationIndexPath{
   
     return  proposedDestinationIndexPath. row  ==  0 ? [ NSIndexPath  indexPathForRow : 1  inSection : 0 ]:proposedDestinationIndexPath;
   
}