TouchJSON How to make a table populated with json clickable? - iphone

Question

I am a total newbie on iOS development. After numerous tries; with lots of sample codes I managed to parse a json string from my server and able to display the results in a dynamic tableview. My problem is I cannot make the cells clickable so they would pass the id and the label to another view where another json parse will be performed to display the details of the row.
Below is my code:
#import "jsonviewcontroller.h"
#import "CJSONDeserializer.h"
#import "Otel_ItemViewController.h"
#implementation jsonviewcontroller
#synthesize tableview;
#synthesize rows;
- (void)dealloc {
[rows release];
[tableview release];
[super dealloc];
}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [rows count];
}
// Customize the appearance of table view cells.
- (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.
NSDictionary *dict = [rows objectAtIndex: indexPath.row];
cell.textLabel.text = [dict objectForKey:#"C_NAME"];
cell.detailTextLabel.text = [dict objectForKey:#"CAT_ID"];
return cell;
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
NSURL *url = [NSURL URLWithString:#"http://zskript.net/categories.php"];
NSString *jsonreturn = [[NSString alloc] initWithContentsOfURL:url];
NSLog(jsonreturn); // Look at the console and you can see what the restults are
NSData *jsonData = [jsonreturn dataUsingEncoding:NSUTF32BigEndianStringEncoding];
NSError *error = nil;
// In "real" code you should surround this with try and catch
NSDictionary * dict = [[[CJSONDeserializer deserializer] deserializeAsDictionary:jsonData error:&error] retain];
if (dict)
{
rows = [dict objectForKey:#"users"];
}
NSLog(#"Array: %#",rows);
[jsonreturn release];
}
// Do some customisation of our new view when a table item has been selected
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure we're referring to the correct segue
if ([[segue identifier] isEqualToString:#"ShowSelectedMovie"]) {
// Get reference to the destination view controller
Otel_ItemViewController *vc = [segue destinationViewController];
// get the selected index
NSInteger selectedIndex = [[self.tableview indexPathForSelectedRow] row];
// Pass the name and index of our film
[vc setSelectedItem:[NSString stringWithFormat:#"%#", [rows objectAtIndex:selectedIndex]]];
[vc setSelectedIndex:selectedIndex];
}
}
- (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 {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
#end
And below is the view that will display the detail:
#import "Otel_ItemViewController.h"
#implementation Otel_ItemViewController
#synthesize selectedIndex, selectedItem;
- (void)viewDidLoad
{
[super viewDidLoad];
[outputLabel setText:selectedItem];
[outputText setText:selectedItem];
[outputImage setImage:[UIImage imageNamed:[NSString stringWithFormat:#"%d.jpg", selectedIndex]]];
}
#end
Currently, when I click the cells in the table, Although I have set it to push to the next view, nothing happens. Would someone please advise?
Here is the updated code.
My root view controller:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *dict = [rows objectAtIndex: indexPath.row];
DetailViewController *controller = [[DetailViewController alloc] init];
controller.CATNAME = [dict objectForKey:#"C_NAME"];
controller.CATNUMBER = [dict objectForKey:#"CAT_ID"];
[self.navigationController pushViewController:controller animated:YES];
[controller release];
}
And here is DetailViewController.h:
#interface DetailViewController : UIViewController {
NSString *CATNAME;
NSInteger CATNUMBER;
IBOutlet UILabel *labelId;
IBOutlet UILabel *LabelName;
}
#property (nonatomic) NSInteger CATNUMBER;
#property (nonatomic, retain) NSString *CATNAME;
#end
And DetailViewController.m:
#import "DetailViewController.h"
#implementation DetailViewController
#synthesize CATNAME, CATNUMBER;
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void) viewDidLoad
{
LabelName.Text = CATNAME;
labelId = CATNUMBER;
// [LabelName setText:CATNAME];
// [labelId setText:CATNUMBER];
}

Answer 1

You have to implement this method
EDIT: Loading a new view
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *dict = [rows objectAtIndex: indexPath.row];
MyNewViewController *controller = [[MyNewViewController alloc] init];
controller.C_NAME = [dict objectForKey:#"C_NAME"];
controller.CAT_ID = [dict objectForKey:#"CAT_ID"];
[self.navigationController pushViewController:controller animated:YES];
[controller release];
}
In the code above I assume you are using a navigation controller (which is the easiest way to do what you want to be doing). Also I am assuming you have a class that inherits from UIViewController that you want to have displayed. I am also assuming that this class which I called MyNewViewController in my example has two members and properties called C_NAME and CAT_ID respectively.
- (void) viewDidLoad
{
labelName.Text = C_NAME;
labelId = CAT_ID
}
The above my be incorrect as I am doing it out of memory. But the principal stays the same, if you passed the variables correctly it should work, you can have a look at my blog it still needs some work done on it, but it has a nice beginners post and shows how to edit the text of the label. In the code above I am assuming your view contains two labels labelName and labelId respectfully.
In there you have access to what cell was selected and you can then define what needs to happen.