From static text to core data in tableView - ios

Question

I have found the way I need to implement a sections collapsable/expandible tableView, but it is populating the row object from the code itself. I have just created a core data entity and want know to populate the row objects with it.
I have also include a NSFetchedResultsController, but I need help converting this particular code to let me add core data objects. This is my current code:
#import "CollapsableTableViewViewController.h"
#import "CollapsableTableView.h"
#import "CollapsableTableViewAppDelegate.h"
#interface CollapsableTableViewViewController()
#property (nonatomic, retain) NSManagedObjectContext *managedObjectContext;
#end
#implementation CollapsableTableViewViewController
#synthesize fetchedResultsController = _fetchedResultsController;
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
*/
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
//1
CollapsableTableViewAppDelegate* appDelegate = [UIApplication sharedApplication].delegate;
//2
self.managedObjectContext = appDelegate.managedObjectContext;
self.fetchedResultsController = nil;
NSError *error;
if (![[self fetchedResultsController] performFetch:&error]) {
// Update to handle the error appropriately.
NSLog(#"Unresolved error %#, %#", error, [error userInfo]);
exit(-1); // Fail
}
CollapsableTableView* tableView = (CollapsableTableView*) myTableView;
tableView.collapsableTableViewDelegate = self;
// [tableView setIsCollapsed:YES forHeaderWithTitle:#"First Section"];
// [tableView setIsCollapsed:YES forHeaderWithTitle:#"Second Section"];
// [tableView setIsCollapsed:YES forHeaderWithTitle:#"Third Section"];
// [tableView setIsCollapsed:YES forHeaderWithTitle:#"Fourth Section"];
// [tableView setIsCollapsed:YES forHeaderWithTitle:#"Fifth Section"];
}
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return YES;
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
[spinner release];
spinner = nil;
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[spinner release];
[super dealloc];
}
#pragma mark -
#pragma mark UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 10;
}
+ (NSString*) titleForHeaderForSection:(int) section
{
switch (section)
{
case 0 : return #"First Section";
case 1 : return #"Second Section";
case 2 : return #"Third Section";
case 3 : return #"Fourth Section";
case 4 : return #"Fifth Section";
default : return [NSString stringWithFormat:#"Section no. %i",section + 1];
}
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return [CollapsableTableViewViewController titleForHeaderForSection:section];
}
// Uncomment the following two methods to use custom header views.
//- (UILabel *) createHeaderLabel: (UITableView *) tableView :(NSString *)headerTitle {
// UILabel *titleLabel = [[[UILabel alloc] initWithFrame:CGRectZero] autorelease];
// titleLabel.frame =CGRectMake(0, 0, tableView.frame.size.width - 20, 60);
// titleLabel.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin;
// titleLabel.backgroundColor = [UIColor clearColor];
// titleLabel.textColor = [UIColor whiteColor];
// titleLabel.font=[UIFont fontWithName:#"Helvetica-Bold" size:20];
// titleLabel.text = headerTitle;
// titleLabel.textAlignment = UITextAlignmentRight;
// return titleLabel;
//}
//
//- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
//{
// // create the parent view that will hold header Label
// UIView * customView = [[[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, tableView.frame.size.width , 60)]autorelease];
// UILabel *titleLabel;
// titleLabel = [self createHeaderLabel: tableView :[CollapsableTableViewViewController titleForHeaderForSection:section]];
//
// [customView addSubview:titleLabel];
//
// UILabel* collapsedLabel = [[[UILabel alloc] initWithFrame:CGRectMake(10,0,50,60)] autorelease];
// collapsedLabel.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin;
// collapsedLabel.backgroundColor = [UIColor clearColor];
// collapsedLabel.textColor = [UIColor whiteColor];
// collapsedLabel.text = #"-";
// collapsedLabel.tag = COLLAPSED_INDICATOR_LABEL_TAG;
// [customView addSubview:collapsedLabel];
//
// customView.tag = section;
// customView.backgroundColor = [UIColor blackColor];
// return customView;
//}
//- (NSString*) tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section
//{
// return [NSString stringWithFormat:#"Footer %i",section + 1];
//}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
switch (section)
{
case 2 : return 0;
case 3 : return 30;
default : return 8;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell.
switch (indexPath.row)
{
case 0 : cell.textLabel.text = #"First Cell"; break;
case 1 : cell.textLabel.text = #"Second Cell"; break;
case 2 : cell.textLabel.text = #"Third Cell"; break;
case 3 : cell.textLabel.text = #"Fourth Cell"; break;
case 4 : cell.textLabel.text = #"Fifth Cell"; break;
case 5 : cell.textLabel.text = #"Sixth Cell"; break;
case 6 : cell.textLabel.text = #"Seventh Cell"; break;
case 7 : cell.textLabel.text = #"Eighth Cell"; break;
default : cell.textLabel.text = [NSString stringWithFormat:#"Cell %i",indexPath.row + 1];
}
//cell.detailTextLabel.text = ...;
return cell;
}
#pragma mark -
#pragma mark CollapsableTableViewDelegate
- (void) collapsableTableView:(CollapsableTableView*) tableView willCollapseSection:(NSInteger) section title:(NSString*) sectionTitle headerView:(UIView*) headerView
{
[spinner startAnimating];
}
- (void) collapsableTableView:(CollapsableTableView*) tableView didCollapseSection:(NSInteger) section title:(NSString*) sectionTitle headerView:(UIView*) headerView
{
[spinner stopAnimating];
}
- (void) collapsableTableView:(CollapsableTableView*) tableView willExpandSection:(NSInteger) section title:(NSString*) sectionTitle headerView:(UIView*) headerView
{
[spinner startAnimating];
}
- (void) collapsableTableView:(CollapsableTableView*) tableView didExpandSection:(NSInteger) section title:(NSString*) sectionTitle headerView:(UIView*) headerView
{
[spinner stopAnimating];
}
#pragma mark -
#pragma mark IBAction methods
- (IBAction) toggleSection2
{
NSString* sectionTitle = //[NSString stringWithFormat:#"Tag %i",1]; // Use this expression when using custom header views.
[CollapsableTableViewViewController titleForHeaderForSection:1]; // Use this expression when specifying text for headers.
CollapsableTableView* collapsableTableView = (CollapsableTableView*) myTableView;
BOOL isCollapsed = [[collapsableTableView.headerTitleToIsCollapsedMap objectForKey:sectionTitle] boolValue];
[collapsableTableView setIsCollapsed:! isCollapsed forHeaderWithTitle:sectionTitle];
}
- (NSFetchedResultsController *)fetchedResultsController {
if (_fetchedResultsController != nil) {
return _fetchedResultsController;
}
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
entityForName:#"ToDoItems" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
NSSortDescriptor *sort = [[NSSortDescriptor alloc]
initWithKey:#"tdText" ascending:NO];
[fetchRequest setSortDescriptors:[NSArray arrayWithObject:sort]];
[fetchRequest setFetchBatchSize:20];
NSFetchedResultsController *theFetchedResultsController =
[[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest
managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil
cacheName:#"Root"];
self.fetchedResultsController = theFetchedResultsController;
_fetchedResultsController.delegate = self;
return _fetchedResultsController;
}
#end

Answer 1

One way to do this is by storing the objects that you fetched into an Array or dictionary and later moving it into cell.
For example, declare NSArray *fetchedResults in your .h file. Then store fetched results into this array as shown below.
if (![[self fetchedResultsController] performFetch:&error]) {
// Update to handle the error appropriately.
NSLog(#"Unresolved error %#, %#", error, [error userInfo]);
exit(-1); // Fail
}
*fetchedResults = [self.managedObjectContext executeFetchRequest:fetchRequest error:&error];
Later, fill your uitableviewcell rows from the array
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell.
// Replacing switch with below code will populate your cell rows in the order in which data is retrieved from core data.
cell.textLabel.text = [self.fetchedResults objectAtIndex:(indexPath.row)] ;
......
......
}
You can add your own logic to get correct content into each rows.