ios8.1 - UITableView.h 头文件方法 翻译，以及部分使用场合

//
//  UITableView.h
//  UIKit
//
//  Copyright (c) 2005-2014 Apple Inc. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <CoreGraphics/CoreGraphics.h>
#import <UIKit/UIScrollView.h>
#import <UIKit/UISwipeGestureRecognizer.h>
#import <UIKit/UITableViewCell.h>
#import <UIKit/UIKitDefines.h>

typedef NS_ENUM(NSInteger, UITableViewStyle) {
    UITableViewStylePlain,                  // regular table view
    UITableViewStyleGrouped                 // preferences style table view
};
//tableview 的类型   plain类型和 group类型

typedef NS_ENUM(NSInteger, UITableViewScrollPosition) {
    UITableViewScrollPositionNone,
    UITableViewScrollPositionTop,    
    UITableViewScrollPositionMiddle,   
    UITableViewScrollPositionBottom
};                // scroll so row of interest is completely visible at top/center/bottom of view
//
typedef NS_ENUM(NSInteger, UITableViewRowAnimation) {
    UITableViewRowAnimationFade,
    UITableViewRowAnimationRight,           // slide in from right (or out to right)
    UITableViewRowAnimationLeft,
    UITableViewRowAnimationTop,
    UITableViewRowAnimationBottom,
    UITableViewRowAnimationNone,            // available in iOS 3.0
    UITableViewRowAnimationMiddle,          // available in iOS 3.2.  attempts to keep cell centered in the space it will/did occupy
    UITableViewRowAnimationAutomatic = 100  // available in iOS 5.0.  chooses an appropriate animation style for you
};
//删除添加时，cell的动画类型枚举
// Including this constant string in the array of strings returned by sectionIndexTitlesForTableView: will cause a magnifying glass icon to be displayed at that location in the index.
// This should generally only be used as the first title in the index.
UIKIT_EXTERN NSString *const UITableViewIndexSearch NS_AVAILABLE_IOS(3_0);

// Returning this value from tableView:heightForHeaderInSection: or tableView:heightForFooterInSection: results in a height that fits the value returned from
// tableView:titleForHeaderInSection: or tableView:titleForFooterInSection: if the title is not nil.
UIKIT_EXTERN const CGFloat UITableViewAutomaticDimension NS_AVAILABLE_IOS(5_0);

@class UITableView;
@class UINib;
@protocol UITableViewDataSource;
@class UILongPressGestureRecognizer;
@class UITableViewHeaderFooterView;
@class UIRefreshControl;
@class UIVisualEffect;

typedef NS_ENUM(NSInteger, UITableViewRowActionStyle) {
    UITableViewRowActionStyleDefault = 0,
    UITableViewRowActionStyleDestructive = UITableViewRowActionStyleDefault,
    UITableViewRowActionStyleNormal
} NS_ENUM_AVAILABLE_IOS(8_0);

NS_CLASS_AVAILABLE_IOS(8_0) @interface UITableViewRowAction : NSObject <NSCopying>

+ (instancetype)rowActionWithStyle:(UITableViewRowActionStyle)style title:(NSString *)title handler:(void (^)(UITableViewRowAction *action, NSIndexPath *indexPath))handler;

@property (nonatomic, readonly) UITableViewRowActionStyle style;
//设置类型
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) UIColor *backgroundColor; // default background color is dependent on style
@property (nonatomic, copy) UIVisualEffect* backgroundEffect;

@end

//_______________________________________________________________________________________________________________
// this represents the display and behaviour of the cells.

@protocol UITableViewDelegate<NSObject, UIScrollViewDelegate>

@optional

// Display customization

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath;
//显示tableviewcell时调用
- (void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section NS_AVAILABLE_IOS(6_0);
//显示header时调用，在cell之后调用
- (void)tableView:(UITableView *)tableView willDisplayFooterView:(UIView *)view forSection:(NSInteger)section NS_AVAILABLE_IOS(6_0);
//显示footer时调用，在header之后调用
- (void)tableView:(UITableView *)tableView didEndDisplayingCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath*)indexPath NS_AVAILABLE_IOS(6_0);
//再删除cell之后调用，停止显示cell的时候调用,界面不显示cell时。  
- (void)tableView:(UITableView *)tableView didEndDisplayingHeaderView:(UIView *)view forSection:(NSInteger)section NS_AVAILABLE_IOS(6_0);
//停止显示header的时候调用
- (void)tableView:(UITableView *)tableView didEndDisplayingFooterView:(UIView *)view forSection:(NSInteger)section NS_AVAILABLE_IOS(6_0);

// Variable height support
//停止显示footer的时候调用

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section;
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section;
//在section中设置每行的高度，header的高度，footer的高度

// Use the estimatedHeight methods to quickly calcuate guessed values which will allow for fast load times of the table.
// If these methods are implemented, the above -tableView:heightForXXX calls will be deferred until views are ready to be displayed, so more expensive logic can be placed there.
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath NS_AVAILABLE_IOS(7_0);
//显示tableview时调用，每个cell调用两次，对可变cell高度的估算， 加载速度提升 参考 http://blog.csdn.net/lengshengren/article/details/19496499

- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForHeaderInSection:(NSInteger)section NS_AVAILABLE_IOS(7_0);
//对可变的header 高度的估算
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForFooterInSection:(NSInteger)section NS_AVAILABLE_IOS(7_0);
//对可变的footer 高度的估算
// Section header & footer information. Views are preferred over title should you decide to provide both

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section;   
//返回uiview类型，返回的uiview 使用在section的header部分，
// custom view for header. will be adjusted to default or specified header height
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section;
//返回uiview类型，返回的uiview 使用在section的footer部分
  // custom view for footer. will be adjusted to default or specified footer height

// Accessories (disclosures).

- (UITableViewCellAccessoryType)tableView:(UITableView *)tableView accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath NS_DEPRECATED_IOS(2_0, 3_0);
//已删除
- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath;
//可手动调用,在其他的触发事件中 传入tableview 以及indexPath参数，进行操作。
// Selection

// -tableView:shouldHighlightRowAtIndexPath: is called when a touch comes down on a row.
// Returning NO to that message halts the selection process and does not cause the currently selected row to lose its selected look while the touch is down.
- (BOOL)tableView:(UITableView *)tableView shouldHighlightRowAtIndexPath:(NSIndexPath *)indexPath NS_AVAILABLE_IOS(6_0);
//按下cell未弹起时调用，即即将高亮时调用,如果return no 则点击的时候没有反应，但是还是会执行此方法
- (void)tableView:(UITableView *)tableView didHighlightRowAtIndexPath:(NSIndexPath *)indexPath NS_AVAILABLE_IOS(6_0);
//按下cell弹起时调用
- (void)tableView:(UITableView *)tableView didUnhighlightRowAtIndexPath:(NSIndexPath *)indexPath NS_AVAILABLE_IOS(6_0);
//点击时，有高亮显示的时候 调用
// Called before the user changes the selection. Return a new indexPath, or nil, to change the proposed selection.
- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath;
//点击cell，弹起时调用， 返回所点击的indexpath
- (NSIndexPath *)tableView:(UITableView *)tableView willDeselectRowAtIndexPath:(NSIndexPath *)indexPath NS_AVAILABLE_IOS(3_0);
//原本被选中时，当点击其他cell时，调用，返回原来的indexpath  EX:如果选择的时row1， 当你点击了row3时，返回1；
// Called after the user changes the selection.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;
//点击cell弹起时调用
- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath NS_AVAILABLE_IOS(3_0);
//原本被选中时，当点击其他cell时，调用，无返回  EX:如果选择的时row1， 当你点击了row3时，返回1；
// Editing      编辑模块

// Allows customization of the editingStyle for a particular cell located at 'indexPath'. If not implemented, all editable cells will have UITableViewCellEditingStyleDelete set for them when the table has editing property set to YES.
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath;
//返回每一行的编辑模式， 可以再次设置add或者删除操作。
- (NSString *)tableView:(UITableView *)tableView titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath NS_AVAILABLE_IOS(3_0);
//cell左滑删除时，删除按钮的标题
- (NSArray *)tableView:(UITableView *)tableView editActionsForRowAtIndexPath:(NSIndexPath *)indexPath NS_AVAILABLE_IOS(8_0);
//自定义编辑左滑后出现的界面。  不止只有一个delete按钮， 可以自行定义，返回一个数组。数组中放着UITableviewRowAction
具体使用方法：http://www.360doc.com/content/14/1218/20/20918780_433979115.shtml
// supercedes -tableView:titleForDeleteConfirmationButtonForRowAtIndexPath: if return value is non-nil


// Controls whether the background is indented while editing.  If not implemented, the default is YES.  This is unrelated to the indentation level below.  This method only applies to grouped style table views.
- (BOOL)tableView:(UITableView *)tableView shouldIndentWhileEditingRowAtIndexPath:(NSIndexPath *)indexPath;
//未实现 默认为yes,进入编辑时，cell是否缩进。  在开启编辑状态时调用。
// The willBegin/didEnd methods are called whenever the 'editing' property is automatically changed by the table (allowing insert/delete/move). This is done by a swipe activating a single row
- (void)tableView:(UITableView*)tableView willBeginEditingRowAtIndexPath:(NSIndexPath *)indexPath;
//右滑 准备进行编辑的时候 调用。 将setediting = yes时不调用
- (void)tableView:(UITableView*)tableView didEndEditingRowAtIndexPath:(NSIndexPath *)indexPath;
//完成编辑的时候调用
// Moving/reordering

// Allows customization of the target row for a particular row as it is being moved/reordered
- (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath;               
//在编辑状态下，返回可以进行move的indexpath
EX： 返回row =1；section =0； 则只能将其他cell往row1中移动。
// Indentation

- (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath; // return 'depth' of row for hierarchies
//设置cell的缩进。  返回index path.row；
// Copy/Paste.  All three methods must be implemented by the delegate.

- (BOOL)tableView:(UITableView *)tableView shouldShowMenuForRowAtIndexPath:(NSIndexPath *)indexPath NS_AVAILABLE_IOS(5_0);
//是否在指定行显示菜单，返回值为YES时，长按显示菜单
- (BOOL)tableView:(UITableView *)tableView canPerformAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender NS_AVAILABLE_IOS(5_0);
//弹出菜单后回调用此方法。
- (void)tableView:(UITableView *)tableView performAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender NS_AVAILABLE_IOS(5_0);
//选择菜单完成后，调用此方法。
@end

UIKIT_EXTERN NSString *const UITableViewSelectionDidChangeNotification;


//_______________________________________________________________________________________________________________

NS_CLASS_AVAILABLE_IOS(2_0) @interface UITableView : UIScrollView <NSCoding>

- (instancetype)initWithFrame:(CGRect)frame style:(UITableViewStyle)style;                // must specify style at creation. -initWithFrame: calls this with UITableViewStylePlain

@property (nonatomic, readonly) UITableViewStyle           style;
@property (nonatomic, assign)   id <UITableViewDataSource> dataSource;
@property (nonatomic, assign)   id <UITableViewDelegate>   delegate;
@property (nonatomic)          CGFloat                     rowHeight;             // will return the default value if unset
@property (nonatomic)          CGFloat                     sectionHeaderHeight;   // will return the default value if unset
@property (nonatomic)          CGFloat                     sectionFooterHeight;   // will return the default value if unset
@property (nonatomic)          CGFloat                     estimatedRowHeight NS_AVAILABLE_IOS(7_0); // default is 0, which means there is no estimate
@property (nonatomic)          CGFloat                     estimatedSectionHeaderHeight NS_AVAILABLE_IOS(7_0); // default is 0, which means there is no estimate
@property (nonatomic)          CGFloat                     estimatedSectionFooterHeight NS_AVAILABLE_IOS(7_0); // default is 0, which means there is no estimate
@property (nonatomic)          UIEdgeInsets                separatorInset NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; // allows customization of the frame of cell separators

@property(nonatomic, readwrite, retain) UIView *backgroundView NS_AVAILABLE_IOS(3_2); // the background view will be automatically resized to track the size of the table view.  this will be placed as a subview of the table view behind all cells and headers/footers.  default may be non-nil for some devices.

// Data

- (void)reloadData;    
  //重新载入tableview  一般是在数据源有改变的时候

           // reloads everything from scratch. redisplays visible rows. because we only keep info about visible rows, this is cheap. will adjust offset if table shrinks
- (void)reloadSectionIndexTitles NS_AVAILABLE_IOS(3_0);   // reloads the index bar.
//重新载入，section的索引标题。
// Info

- (NSInteger)numberOfSections;
- (NSInteger)numberOfRowsInSection:(NSInteger)section;

- (CGRect)rectForSection:(NSInteger)section;                                    // includes header, footer and all rows
- (CGRect)rectForHeaderInSection:(NSInteger)section;
- (CGRect)rectForFooterInSection:(NSInteger)section;
- (CGRect)rectForRowAtIndexPath:(NSIndexPath *)indexPath;
//以上 返回各部分的rect

- (NSIndexPath *)indexPathForRowAtPoint:(CGPoint)point;                         
//返回 点所在位置的indexpath
// returns nil if point is outside of any row in the table
- (NSIndexPath *)indexPathForCell:(UITableViewCell *)cell;                  
//返回这个cell 所在的indexPath
    // returns nil if cell is not visible
- (NSArray *)indexPathsForRowsInRect:(CGRect)rect;                              // returns nil if rect not valid

- (UITableViewCell *)cellForRowAtIndexPath:(NSIndexPath *)indexPath;   
//返回索引所指向的cell。
         // returns nil if cell is not visible or index path is out of range
- (NSArray *)visibleCells;
//返回tableview中可见的cell  返回类型nsarray
- (NSArray *)indexPathsForVisibleRows;
//返回一个nsarray ， array中向上包含tableview中 可见indexpath   ex：若你cell总数为50行，高亮的行数在20行，则返回0-19的index path

- (UITableViewHeaderFooterView *)headerViewForSection:(NSInteger)section NS_AVAILABLE_IOS(6_0);
- (UITableViewHeaderFooterView *)footerViewForSection:(NSInteger)section NS_AVAILABLE_IOS(6_0);
//返回相应section的footer 和 header
- (void)scrollToRowAtIndexPath:(NSIndexPath *)indexPath atScrollPosition:(UITableViewScrollPosition)scrollPosition animated:(BOOL)animated;
//根据传入的indexpath，滚动到相对应的位置，第二个参数是控制对应的cell再滚动后处于tableview的顶部/底部/中部等
- (void)scrollToNearestSelectedRowAtScrollPosition:(UITableViewScrollPosition)scrollPosition animated:(BOOL)animated;
//滚动到被选中项。  滚动后处于tableview的顶部/底部/中部等
// Row insertion/deletion/reloading.

- (void)beginUpdates;   // allow multiple insert/delete of rows and sections to be animated simultaneously. Nestable
- (void)endUpdates;     // only call insert/delete/reload calls or change the editing state inside an update block.  otherwise things like row count, etc. may be invalid.

- (void)insertSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation;
//插入section
- (void)deleteSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation;
- (void)reloadSections:(NSIndexSet *)sections withRowAnimation:
(UITableViewRowAnimation)animation NS_AVAILABLE_IOS(3_0);
//删除section
- (void)moveSection:(NSInteger)section toSection:(NSInteger)newSection NS_AVAILABLE_IOS(5_0);
//移动section

- (void)insertRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;
//在所对应的indexpath中插入行
- (void)deleteRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;
//删除对应indexpaths的行
- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation NS_AVAILABLE_IOS(3_0);
//局部重新载入
- (void)moveRowAtIndexPath:(NSIndexPath *)indexPath toIndexPath:(NSIndexPath *)newIndexPath NS_AVAILABLE_IOS(5_0);
//移动row。
// Editing. When set, rows show insert/delete/reorder controls based on data source queries

@property (nonatomic, getter=isEditing) BOOL editing;                             // default is NO. setting is not animated.
- (void)setEditing:(BOOL)editing animated:(BOOL)animated;

@property (nonatomic) BOOL allowsSelection NS_AVAILABLE_IOS(3_0);  // default is YES. Controls whether rows can be selected when not in editing mode
@property (nonatomic) BOOL allowsSelectionDuringEditing;                                     // default is NO. Controls whether rows can be selected when in editing mode
@property (nonatomic) BOOL allowsMultipleSelection NS_AVAILABLE_IOS(5_0);                 // default is NO. Controls whether multiple rows can be selected simultaneously
@property (nonatomic) BOOL allowsMultipleSelectionDuringEditing NS_AVAILABLE_IOS(5_0);   // default is NO. Controls whether multiple rows can be selected simultaneously in editing mode

// Selection

- (NSIndexPath *)indexPathForSelectedRow;    
//选中行的index path                                            // returns nil or index path representing section and row of selection.
- (NSArray *)indexPathsForSelectedRows NS_AVAILABLE_IOS(5_0);
//返回一个多行选中的indexpath数组
// returns nil or a set of index paths representing the sections and rows of the selection.

// Selects and deselects rows. These methods will not call the delegate methods (-tableView:willSelectRowAtIndexPath: or tableView:didSelectRowAtIndexPath:), nor will it send out a notification.
- (void)selectRowAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated scrollPosition:(UITableViewScrollPosition)scrollPosition;
//调用此方法，此indexpath的cell被选中，若此cell不再可视范围内，自动按照最后一个参数的方式进行滚动
- (void)deselectRowAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated;
//取消此indexpath的选中状态
// Appearance

@property (nonatomic) NSInteger sectionIndexMinimumDisplayRowCount;                                                      // show special section index list on right when row count reaches this value. default is 0
@property (nonatomic, retain) UIColor *sectionIndexColor NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;                   // color used for text of the section index
@property (nonatomic, retain) UIColor *sectionIndexBackgroundColor NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR;         // the background color of the section index while not being touched
@property (nonatomic, retain) UIColor *sectionIndexTrackingBackgroundColor NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR; // the background color of the section index while it is being touched

@property (nonatomic) UITableViewCellSeparatorStyle separatorStyle; // default is UITableViewCellSeparatorStyleSingleLine
@property (nonatomic, retain) UIColor              *separatorColor UI_APPEARANCE_SELECTOR; // default is the standard separator gray
@property (nonatomic, copy) UIVisualEffect               *separatorEffect NS_AVAILABLE_IOS(8_0) UI_APPEARANCE_SELECTOR; // effect to apply to table separators

@property (nonatomic, retain) UIView *tableHeaderView;                           // accessory view for above row content. default is nil. not to be confused with section header
@property (nonatomic, retain) UIView *tableFooterView;                           // accessory view below content. default is nil. not to be confused with section footer

- (id)dequeueReusableCellWithIdentifier:(NSString *)identifier;  // Used by the delegate to acquire an already allocated cell, in lieu of allocating a new one.
- (id)dequeueReusableCellWithIdentifier:(NSString *)identifier forIndexPath:(NSIndexPath *)indexPath NS_AVAILABLE_IOS(6_0); // newer dequeue method guarantees a cell is returned and resized properly, assuming identifier is registered
- (id)dequeueReusableHeaderFooterViewWithIdentifier:(NSString *)identifier NS_AVAILABLE_IOS(6_0);  // like dequeueReusableCellWithIdentifier:, but for headers/footers

// Beginning in iOS 6, clients can register a nib or class for each cell.
// If all reuse identifiers are registered, use the newer -dequeueReusableCellWithIdentifier:forIndexPath: to guarantee that a cell instance is returned.
// Instances returned from the new dequeue method will also be properly sized when they are returned.
- (void)registerNib:(UINib *)nib forCellReuseIdentifier:(NSString *)identifier NS_AVAILABLE_IOS(5_0);
- (void)registerClass:(Class)cellClass forCellReuseIdentifier:(NSString *)identifier NS_AVAILABLE_IOS(6_0);

- (void)registerNib:(UINib *)nib forHeaderFooterViewReuseIdentifier:(NSString *)identifier NS_AVAILABLE_IOS(6_0);
- (void)registerClass:(Class)aClass forHeaderFooterViewReuseIdentifier:(NSString *)identifier NS_AVAILABLE_IOS(6_0);

@end

//_______________________________________________________________________________________________________________
// this protocol represents the data model object. as such, it supplies no information about appearance (including the cells)

@protocol UITableViewDataSource<NSObject>

@required

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;
//每个section中有多少行
// Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier:
// Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls)

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
// cell的内容
@optional

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView;
//section数量
              // Default is 1 if not implemented

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section;   
//返回某个section对应的header标题
  // fixed font style. use custom view (UILabel) if you want something different
- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section;
//返回某个section对应的footer标题
// Editing

// Individual rows can opt out of having the -editing property set for them. If not implemented, all rows are assumed to be editable.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath;
//设置cell为可编辑模式 与commitEditXXXX共同使用
// Moving/reordering

// Allows the reorder accessory view to optionally be shown for a particular row. By default, the reorder control will be shown only if the datasource implements -tableView:moveRowAtIndexPath:toIndexPath:
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath;
//设置cell为可移动模式 与 tableview：moveXXXXX方法共同使用
// Index

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView;
//返回要显示的section索引标题                                                    // return list of section titles to display in section index view (e.g. "ABCD...Z#")
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index;  
// 点击右侧索引表项时调用

// tell table which section corresponds to section title/index (e.g. "B",1))

// Data manipulation - insert and delete support

// After a row has the minus or plus button invoked (based on the UITableViewCellEditingStyle for the cell), the dataSource must commit the change
// Not called for edit actions using UITableViewRowAction - the action's handler will be invoked instead
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath;
//提交编辑
// Data manipulation - reorder / moving support

- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath;
//移动时使用
@end

//_______________________________________________________________________________________________________________

// This category provides convenience methods to make it easier to use an NSIndexPath to represent a section and row
@interface NSIndexPath (UITableView)

+ (NSIndexPath *)indexPathForRow:(NSInteger)row inSection:(NSInteger)section;

@property(nonatomic,readonly) NSInteger section;
@property(nonatomic,readonly) NSInteger row;

@end