IOS Study Notes (9) tableview Basics

Tableview is a rolling view divided into different parts. Each part is further divided into rows. Each row is an instance of the uitableviewcell class. You can embed images, text, and anything into tableview cells to customize their shapes, heights, groups, or more. These are defined in the uitableviewdatasource and uitableviewdelegate Protocols respectively.

# Import <uikit/uikit. h>

@ Interface tableviewcontroller: uiviewcontroller

@ Property (monatomic, strong) uitableview * mytableview;

@ End

@ Implementation tableviewcontroller

@ Synthesize mytableview;

-(Void) viewdidload {

[Super viewdidload];

Self. mytableview = [[uitableview alloc] initwithframe: Self. View. bounds style: uitableviewstyleplain];

[Self. View addsubview: Self. mytableview];

}

In this way, a blank tableview is created.

Uitableviewstyleplain
Create a blank table view with no background image
Uitableviewstylegrouped
Create a table view with a border of a background image and a rounded corner, similar to the Settings app.

How to add data?

Follow the uitableviewdelegate protocol:

// Set the height of tableviewcell

-(Void) viewdidload {

[Super viewdidload];

Cgrect tableviewframe = self. View. bounds;

Self. mytableview = [[uitableview alloc] initwithframe: tableviewframe style: uitableviewstyleplain];

Self. mytableview. Delegate = self;

[Self. View addsubview: Self. mytableview];

}

-(Void) tableview :( uitableview *) tableview heightforrowatindexpath :( nsindexpath *) indexpath {

Cgfloat result = 20366f;

If ([tableview isequal: Self. mytableview]) {

Result = 40366f;

}

Return result;

}

The positions of cells in tableview are displayed by their index paths. An index path is a combination of section and row indexes. The Section index starts from scratch.

Add data:

To add data, follow the uitableviewdatasource protocol.

Add code

Self. mytableview. datasource = self;

Self. mytableview. autoresizingmask = uiviewautoresizingflexiblewidth | uiviewautoresizingflexibleheight;

-(Nsinteger) numberofsectionsintableview :( uitableview *) tableview {

Nsinteger result = 0;

If ([tableview isequal: Self. mytableview]) {

Result = 3;

}

Return result;

}

-(Nsinteger) tableview :( uitableview *) tableview numberofrowsinsection :( nsinteger) Section {

Nsinteger result = 0;

If ([tableview isequal: Self. mytableview]) {

Switch (section ){

Case 0 :{

Result = 3;

Break;

}

Case 1 :{

Result = 5;

Break;

}

Case 2 :{

Result = 8;

Break;

}

}

}

Return result;

}

-(Uitableviewcell *) tableview :( uitableview *) tableview cellforatindexpath :( nsindexpath *) indexpath {

Uitableviewcell * result = nil;

If ([tableview isequal: Self. mytableview]) {

Static nsstring * tableviewcellidentifier = @ "mycells ";

Result = [tableview dequeuereusablecellwithidentifier: tableviewcellidentifier];

If (result = nil ){

Result = [[uitableviewcell alloc] initwithstyle: uitableviewcellstyledefault reuseidentifier: tableviewcellidentifier];

}

Result. textlabel. Text = [nsstring stringwithformat: @ "section % lD, cell % lD", (long) indexpath. Section, (long) indexpath. Row];

}

Return result;

}

Receive and process table view events

-(Void) tableview :( uitableview *) tableview didselectrowatindexpath :( nsindexpath *) indexpath {

If ([tableview isequal: Self. mytableview]) {

Nslog (@ "% @", [nsstring stringwithformat: @ "cell % LD in section % LD is selected", (long) indexpath. row, (long) indexpath. section]);

}

}

Use different types of attachments in tableview

Result. accessorytype = uitableviewcellaccessorydetaildisclosurebutton;

Create a custom tableview cell attachment

-(Uitableviewcell *) tableview :( uitableview *) tableview cellforrowatindexpath :( nsindexpath *) indexpath {

Uitableviewcell * result = nil;

Static nsstring * mycellidentifier = @ "simplecell ";

Result = [tableview dequeuereusablecellwithidentifier: mycellidentifier];

If (result = nil ){

Result = [[uitableviewcell alloc] initwithstyle: uitableviewcellstyledefault reuseidentifier: mycellidentifier];

}

Result. textlabel. Text = [nsstring stringwithformat: @ "section % lD, cell % lD", (long) indexpath. Section, (long) indexpath. Row];

Uibutton * button = [uibutton buttonwithtype: uibuttonwithtype: uibuttontyperoundedrect];

Button. Frame = cgrectmake (0.0f, 0.0f, 150366f, 25366f );

[Button settitle: @ "Expand" forstate: uicontrolstatenormal];

[Button addtarget: Self action: @ selector (performexpand :) forcontrolevents: uicontroleventtouchupinside];

Result. accessoryview = button;

Return result;

}

-(Void) performexpand :( ID) paramsender {

/* Take an at ion here */

Uitableviewcell * ownercell = (uitableviewcell *) paramsender: superview;

If (ownercell! = Nil ){

Nsindexpath * ownercellindexpath = [self. mytableview indexpathforcell: ownercell];

Nslog (@ "accessory in index path is tapped. indexpath = % @", ownercellindexpath );

If (ownercellindexpath. Section = 0 & ownercellindexpath. Row = 1 ){

/* This is the second row in the first section */

}

}

}