Switch example from UITableViewController to UITableView - ios

Question

I am relatively new in iOS, I have found an example of accordion table view that I need. But the thing is that example is TableViewController and I need to implement TableView inside viewController. Can you please help me. What I have tried to do is create tableView, declare it in the h file as
#property (strong, nonatomic) IBOutlet UITableView *MyTb;
and then change all appearances of self.tableView to self.MyTb but it did not work, oh also changed
AccordionTableViewController : UITableViewController
to
AccordionTableViewController : UIViewController
So here is the original code, please help me and provide some guiadance to it, thanks.
h file:
#import <UIKit/UIKit.h>
#interface AccordionTableViewController : UITableViewController {
NSArray *topItems;
NSMutableArray *subItems; // array of arrays
int currentExpandedIndex;
}
#end
m file:
#import "AccordionTableViewController.h"
#define NUM_TOP_ITEMS 20
#define NUM_SUBITEMS 6
#implementation AccordionTableViewController
- (id)init {
self = [super init];
if (self) {
topItems = [[NSArray alloc] initWithArray:[self topLevelItems]];
subItems = [NSMutableArray new];
currentExpandedIndex = -1;
for (int i = 0; i < [topItems count]; i++) {
[subItems addObject:[self subItems]];
}
}
return self;
}
#pragma mark - Data generators
- (NSArray *)topLevelItems {
NSMutableArray *items = [NSMutableArray array];
for (int i = 0; i < NUM_TOP_ITEMS; i++) {
[items addObject:[NSString stringWithFormat:#"Item %d", i + 1]];
}
return items;
}
- (NSArray *)subItems {
NSMutableArray *items = [NSMutableArray array];
int numItems = arc4random() % NUM_SUBITEMS + 2;
for (int i = 0; i < numItems; i++) {
[items addObject:[NSString stringWithFormat:#"SubItem %d", i + 1]];
}
return items;
}
#pragma mark - View management
- (void)viewDidLoad {
[super viewDidLoad];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [topItems count] + ((currentExpandedIndex > -1) ? [[subItems objectAtIndex:currentExpandedIndex] count] : 0);
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *ParentCellIdentifier = #"ParentCell";
static NSString *ChildCellIdentifier = #"ChildCell";
BOOL isChild =
currentExpandedIndex > -1
&& indexPath.row > currentExpandedIndex
&& indexPath.row <= currentExpandedIndex + [[subItems objectAtIndex:currentExpandedIndex] count];
UITableViewCell *cell;
if (isChild) {
cell = [tableView dequeueReusableCellWithIdentifier:ChildCellIdentifier];
}
else {
cell = [tableView dequeueReusableCellWithIdentifier:ParentCellIdentifier];
}
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ParentCellIdentifier] autorelease];
}
if (isChild) {
cell.detailTextLabel.text = [[subItems objectAtIndex:currentExpandedIndex] objectAtIndex:indexPath.row - currentExpandedIndex - 1];
}
else {
int topIndex = (currentExpandedIndex > -1 && indexPath.row > currentExpandedIndex)
? indexPath.row - [[subItems objectAtIndex:currentExpandedIndex] count]
: indexPath.row;
cell.textLabel.text = [topItems objectAtIndex:topIndex];
cell.detailTextLabel.text = #"";
}
return cell;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
BOOL isChild =
currentExpandedIndex > -1
&& indexPath.row > currentExpandedIndex
&& indexPath.row <= currentExpandedIndex + [[subItems objectAtIndex:currentExpandedIndex] count];
if (isChild) {
NSLog(#"A child was tapped, do what you will with it");
return;
}
[self.tableView beginUpdates];
if (currentExpandedIndex == indexPath.row) {
[self collapseSubItemsAtIndex:currentExpandedIndex];
currentExpandedIndex = -1;
}
else {
BOOL shouldCollapse = currentExpandedIndex > -1;
if (shouldCollapse) {
[self collapseSubItemsAtIndex:currentExpandedIndex];
}
currentExpandedIndex = (shouldCollapse && indexPath.row > currentExpandedIndex) ? indexPath.row - [[subItems objectAtIndex:currentExpandedIndex] count] : indexPath.row;
[self expandItemAtIndex:currentExpandedIndex];
}
[self.tableView endUpdates];
}
- (void)expandItemAtIndex:(int)index
{
NSMutableArray *indexPaths = [NSMutableArray new];
NSArray *currentSubItems = [subItems objectAtIndex:index];
int insertPos = index + 1;
for (int i = 0; i < [currentSubItems count]; i++) {
[indexPaths addObject:[NSIndexPath indexPathForRow:insertPos++ inSection:0]];
}
[self.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];
[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:index inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:YES];
//[indexPaths release];
}
- (void)collapseSubItemsAtIndex:(int)index
{
NSMutableArray *indexPaths = [NSMutableArray new];
for (int i = index + 1; i <= index + [[subItems objectAtIndex:index] count]; i++)
{
[indexPaths addObject:[NSIndexPath indexPathForRow:i inSection:0]];
}
[self.tableView deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];
//[indexPaths release];
}
- (void)dealloc
{
[topItems release];
[subItems release];
[super dealloc];
}
#end

Answer 1

You must set your view controller as delegate and datasource of your tableview:
#interface AccordionTableViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
in your header file and in viewDidLoad:
-(void)viewDidLoad {
[super viewDidLoad];
self.MyTb.delegate = self;
self.MyTb.dataSource = self;
}
Or you can set the datasource and delegate in Storyboard. You must also make sure you have connected the table view to MyTb IBOutlet in storyboard.