Add index (iOS development)

Indexes are used to aid queries.

Principle:

-the index title cannot be exactly the same as the caption displayed;

-The index should be representative and representative of a data set;

-If an indexed list view is used, the extended view is not normally used. (easy to point to)

The data source method that will be re-used:

Tableview:numberofrowsinsection:------Gets the number of rows in a section

Tableview:cellforrowatindexpath: Implementation of-------cell data

Numberofsectionintableview:----------Get the number of sections

Tableview:titleforheaderinsection:--------section title

Sectionindextitlesfortableview:--------Get Index

@implementation viewcontroller-(void) viewdidload {[Super viewdidload];    NSBundle *bundle = [NSBundle mainbundle]; NSString *plistpath = [Bundle pathforresource:@ "Team_dictionary" oftype:@ "plist"        ];    Get all data in the attribute list file Self.dicdata = [[Nsdictionary alloc] initwithcontentsoffile:plistpath];    Nsarray *templist = [Self.dicdata AllKeys]; To sort key//selector to SEL type, the parameters of the Sortedarrayusingselector method must be selector self.listgroupname = [Templist Sortedarrayusi Ngselector: @selector (compare:)];}    -(void) didreceivememorywarning {[Super didreceivememorywarning]; Dispose of any resources the can be recreated.} #pragma mark rewrite the data source Method-(Nsinteger) TableView: (UITableView *) TableView numberofrowsinsection: (nsinteger) section{//According to the section cable    Derive group name from group an array group nsstring *groupname = [Self.listgroupname objectatindex:section];    Take the group name as key and remove the team array from the dictionary//Because the hash structure is stored as nsarray *listteams = [Self.dicdata objectforkey:groupname]; //How many teams return [Listteams Count] in this section;} -(UITableViewCell *) TableView: (UITableView *) TableView Cellforrowatindexpath: (Nsindexpath *) indexpath{static    NSString *cellidentifier = @ "Cellidentifier";    UITableViewCell *cell = [TableView dequeuereusablecellwithidentifier:cellidentifier]; if (cell = = nil) {cell = [[UITableViewCell alloc] Initwithstyle:uitableviewcellstylesubtitle Reuseidentifier:celli    Dentifier];    }//Gets the selected section A group of 1th nsuinteger section = [indexpath sections];    Get the row index selected in the selection section--Group A 1th, 2nd ...    Nsuinteger row = [Indexpath row];    Get group name from group an array group by section index--Group A nsstring *groupname = [Self.listgroupname objectatindex:section];        Take the group name as key and remove the team array collection from the dictionary nsarray *listteams = [Self.dicdata objectforkey:groupname];    Cell.textLabel.text = [Listteams objectatindex:row]; return cell;} -(Nsinteger) Numberofsectionsintableview: (UITableView *) tableview{//The section number of rows return [Self.listgroupname count];} -(NSString *) TableView: (UITableView *) TablevieW titleforheaderinsection: (nsinteger) section{//section header of the section nsstring *groupname = [Self.listgroupname objectAtIndex:secti    On]; return groupName;} -(Nsarray *) Sectionindextitlesfortableview: (UITableView *) tableview{//Add index Nsmutablearray *listtitles = [[NSMutab    Learray Alloc] initwithcapacity:[self.listgroupname Count]];        Change Group A to (NSString *item in self.listgroupname) {nsstring *title = [item substringtoindex:1];//Get first character only  [Listtitles Addobject:title]; Append the last position of the string array} return listtitles;} @end

Attention:

In the story version to configure the TableView delegation AGREEMENT!!!!

Add index (iOS development)