ios UITableView 的委托和数据源方法

delegate and datasource methods for UITableView

提问by kiran kumar

Can anyone list delegate methods and data source methods for UITableView?

任何人都可以列出 的委托方法和数据源方法UITableView吗？

Are delegates and data sources methods are same for UITableView?

委托和数据源方法是否相同UITableView？

回答by raw3d

I have prepared a sheet of all methods in delegate and datasource.

我准备了一张包含委托和数据源中所有方法的表格。

回答by visakh7

//_______________________________________________________________________________________________________________
// 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;

// Variable height support

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section;
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section;

// Section header & footer information. Views are preferred over title should you decide to provide both

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section;   // custom view for header. will be adjusted to default or specified header height
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section;   // custom view for footer. will be adjusted to default or specified footer height

// Accessories (disclosures). 

- (UITableViewCellAccessoryType)tableView:(UITableView *)tableView accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_NA,__MAC_NA,__IPHONE_2_0,__IPHONE_3_0);
- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath;

// Selection

// 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;
- (NSIndexPath *)tableView:(UITableView *)tableView willDeselectRowAtIndexPath:(NSIndexPath *)indexPath __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);
// Called after the user changes the selection.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;
- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);

// Editing

// 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;
- (NSString *)tableView:(UITableView *)tableView titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);

// 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;

// 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;
- (void)tableView:(UITableView*)tableView didEndEditingRowAtIndexPath:(NSIndexPath *)indexPath;

// 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;               

// Indentation

- (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath; // return 'depth' of row for hierarchies

@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;

// 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;

@optional

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

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section;    // fixed font style. use custom view (UILabel) if you want something different
- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section;

// 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;

// 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;

// Index

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView;                                                    // 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;  // 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
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath;

// Data manipulation - reorder / moving support

- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath;

@end

回答by Saurabh

   tableView:accessoryButtonTappedForRowWithIndexPath:   
   tableView:didDeselectRowAtIndexPath:   
   tableView:didEndEditingRowAtIndexPath:   
   tableView:didSelectRowAtIndexPath:   
   tableView:editingStyleForRowAtIndexPath:   
   tableView:heightForFooterInSection:   
   tableView:heightForHeaderInSection:   
   tableView:heightForRowAtIndexPath:  
   tableView:indentationLevelForRowAtIndexPath:   
   tableView:shouldIndentWhileEditingRowAtIndexPath:   
   tableView:targetIndexPathForMoveFromRowAtIndexPath:toProposedIndexPath:   
   tableView:titleForDeleteConfirmationButtonForRowAtIndexPath:   
   tableView:viewForFooterInSection:   
   tableView:viewForHeaderInSection:   
   tableView:willBeginEditingRowAtIndexPath:   
   tableView:willDeselectRowAtIndexPath:   
   tableView:willDisplayCell:forRowAtIndexPath:   
   tableView:willSelectRowAtIndexPath:  

have a look

有一个看看

回答by Krishnabhadra

List them?? No they are not same.. Look at documentation.. http://developer.apple.com/library/ios/#documentation/uikit/reference/UITableViewDelegate_Protocol/Reference/Reference.html

列出他们？？不，它们不一样.. 查看文档.. http://developer.apple.com/library/ios/#documentation/uikit/reference/UITableViewDelegate_Protocol/Reference/Reference.html

http://developer.apple.com/library/ios/#documentation/uikit/reference/UITableViewDataSource_Protocol/Reference/Reference.html

http://developer.apple.com/library/ios/#documentation/uikit/reference/UITableViewDataSource_Protocol/Reference/Reference.html

Datasource methods are used to generate tableView cells,header and footer before they are displaying..Delegate methods provide information about these cells, header and footer along with other user action handlers like cell selection and edit..

数据源方法用于在显示之前生成 tableView 单元格、页眉和页脚。委托方法提供有关这些单元格、页眉和页脚以及其他用户操作处理程序（如单元格选择和编辑）的信息。

回答by Johan

I dont understand the last part of your question.

我不明白你问题的最后一部分。

There is a great place provided by Apple called 'iOS Dev Center' that will answer almost all questions you can have about developing for iOS devices. This information is also available through Xcode.

Apple 提供了一个名为“iOS 开发中心”的好地方，可以回答几乎所有有关为 iOS 设备进行开发的问题。此信息也可通过 Xcode 获得。

UITableDataSource

UITable数据源

UITableViewDelegate

UITableViewDelegate

回答by Debasish Bose

Data Source Method:

数据来源方法：

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

and

和

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{}

Delegate method:

委托方式：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{}



- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath{}

This are the main methods which we use to make table view work. Apart from this there are lots of method. Read UITableView Delegate and Datasource documentation to know more methods and its working.

这是我们用来使表格视图工作的主要方法。除此之外还有很多方法。阅读 UITableView 委托和数据源文档以了解更多方法及其工作原理。

回答by Annu

Go to the link, it will describe about all the basics of UITableView.

转到链接，它将描述有关UITableView.

Primary Methods of UITableVieware:

的主要方法UITableView是：

– tableView:cellForRowAtIndexPath:// required method

– tableView:cellForRowAtIndexPath:// 需要的方法

– tableView:numberOfRowsInSection:// required method

– tableView:numberOfRowsInSection:// 需要的方法

– numberOfSectionsInTableView:

– sectionIndexTitlesForTableView:

– tableView:sectionForSectionIndexTitle:atIndex:

– tableView:titleForHeaderInSection:

– tableView:titleForFooterInSection:

The required one are those whom you must have to include in the code. Don't forget to link the Table delegate and datasource with File Owner.

所需的是那些您必须包含在代码中的人。不要忘记将表委托和数据源与文件所有者链接。

回答by bLacK hoLE

Which ever method returns a value, that is a dataSource method and other remaining method is delegate method

哪个方法返回一个值，即 dataSource 方法，其他剩余方法是委托方法

Given Below

下面给出

delegate methods

委托方法

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

Data Source

数据源

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

回答by Ahmad Kayyali

UITableViewDelegate Protocol Reference

UITableViewDelegate 协议参考

回答by Maulik Salvi

#pragma mark Tableview Delegate Method

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

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

- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = (UITableViewCell *) [tableView dequeueReusableCellWithIdentifier:@"TableviewCell"];

    UILabel *lbldescription = (UILabel *)[cell viewWithTag:1];

    cell.selectionStyle=UITableViewCellSelectionStyleNone;
    cell.backgroundColor=[UIColor clearColor];
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;
{
}

-(CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return UITableViewAutomaticDimension;
}

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

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {

    UITableViewCell *cell = (UITableViewCell *) [tableView dequeueReusableCellWithIdentifier:@"TableviewCell_Header"];

    cell.selectionStyle=UITableViewCellSelectionStyleNone;
    cell.backgroundColor=[UIColor whiteColor];

    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    return 100;
}