Table view learning

I. Overview

We often need to display a large amount of data, such as the iPhone's built-in Address Book application. Uitableview is a subclass of uiscrollview. On the iPhone, the table view is a column on the iPhone with multiple rows. you can scroll up or down to view more data. From the user's perspective, creating a table view is to complete the following three functions:

• Create a table View
• Provide text or images for each line
• When you select a row, make a response

A table view must have a data source, which is achieved through the uitableviewdatasource protocol. In addition, the table view uses the uitableviewdelegate protocol to perform operations on the table view. Generally, you create a subclass of uitableviewcontroller and then operate the data source and table view on this subclass.

1.1 table view type

Table views have two display styles:

1. ungrouped display --- uitableviewstyleplain

2. group display --- uitableviewstylegrouped

For the group structure, each group is called a section, and each row in a section is called a table cell)

Ii. Common uitableview Methods

2.1 initialize a table View

-(ID) initwithframe :( cgrect) frame style :( uitableviewstyle) style;

2.2 table view configuration method

-(Uitableviewcell *) dequeuereusablecellwithidentifier :( nsstring *) identifier; // you can find a uitableviewcell object based on the unique identifier.

-(Nsinteger) numberofrowsinsection :( nsinteger) Section; // returns the number of rows in the table view of the specified section.

-(Nsinteger) numberofsections; // return the number of sections in the table view.

2.3 access section and form element (uitableviewcell)

-(Uitableviewcell *) cellforrowatindexpath :( nsindexpath *) indexpath; // return the form element of the specified nsindexpath, nsindexpath objectRepresentativeInOneNested ArraySetTreeOfSpecific NodeOfPath.This roadCalledIndexPath. Here, you only need to understand nsindexpath as a path that represents the form Element location. According to this nsindexpath path, you can locate the corresponding form element.

-(Nsindexpath *) indexpathforcell :( uitableviewcell *) cell; // return nsindexpath information of the specified form Element

-(Nsindexpath *) indexpathforrowatpoint :( cgpoint) point; // returnNsindexpath

-(Nsarray *) indexpathsforrowsinrect :( cgrect) rect; // returns the nsindexpath information array of the specified cgrect.

-(Nsarray *) visiblecells; // returns the visible uitableviewcell Array

-(Nsarray *) indexpathsforvisiblerows; // return the value of the visible form ElementNsindexpath path information array

2.4 Management Section

-(Nsindexpath *) indexpathforselectedrow; // returnsNsindexpath

-(Void) selectrowatindexpath :( nsindexpath *) indexpath animated :( bool) animated scrollposition :( uitableviewscrollposition) scrollposition ;//

-(Void) deselectrowatindexpath :( nsindexpath *) indexpath animated :( bool) animated ;//

2.5 insert and delete form elements (uitableviewcell)

-(Void) beginupdates

-(Void) endupdates

-(Void) insertrowsatindexpaths :( nsarray *) indexpaths withrowanimation :( uitableviewrowanimation) Animation

-(Void) deleterowsatindexpaths :( nsarray *) indexpaths withrowanimation :( uitableviewrowanimation) Animation

-(Void) insertsections :( nsindexset *) Sections withrowanimation :( uitableviewrowanimation) Animation

-(Void) deletesections :( nsindexset *) Sections withrowanimation :( uitableviewrowanimation) Animation

-(Void) setediting :( bool) Editing animated :( bool) animate

2.6 loading table View data

-(Void) reloaddata

-(Void) reloadrowsatindexpaths :( nsarray *) indexpaths withrowanimation :( uitableviewrowanimation) Animation

-(Void) reloadsections :( nsindexset *) Sections withrowanimation :( uitableviewrowanimation) Animation

-(Void) reloadsectionindextitles