Loading plist into iOS TableView

问题

I have a plist (images.plist) with the following contents

As you can see, each item has a numerical key, from 0-19. Each item also has two strings (fileName and fileInfo).

I'm trying to load all of the fileName's into a TableView. Here's my attempt:

RosterMasterViewController.h

@interface RosterMasterViewController : UITableViewController

@property (nonatomic, strong) NSDictionary *roster;

@end

RosterMasterViewController.m

@implementation RosterMasterViewController

@synthesize roster = _roster;

...
// This is in my 'viewDidLoad'
NSString *file = [[NSBundle mainBundle] pathForResource:@"images" ofType:@"plist"];
self.roster = [NSDictionary dictionaryWithContentsOfFile:file];

And here's how I'm trying to load the fileName into the Prototype Cells.

RosterMasterViewController.m

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"imageNameCell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    // Configure the cell
    cell.textLabel.text = [[[self.roster allKeys] objectAtIndex:indexPath.row] objectForKey:@"fileName"];
   return cell;
}

NOTE For the record, my CellIdentifier is correct, if I set the cell.textLabel.text to be @"HELLO!", then I will see "HELLO!" for each item in the NSDictionary. I'm having difficulty with the //Configure the cell section

Unfortunately this isn't working as I expected. I'm having difficulty since my keys are all numerical I think.

UPDATE

Trying to use what I've learned from the answers below, I have this:

// Configure the cell
NSLog(@"Key: %@", [NSNumber numberWithInt:indexPath.row]);
NSDictionary *dict = [self.roster objectForKey:[NSNumber numberWithInt:indexPath.row]];
NSLog(@"Dictionary: %@", dict);
NSString *fileName = [dict objectForKey:@"fileName"];
NSLog(@"FileName: %@", fileName);

cell.textLabel.text = fileName;
return cell;

But that's giving me results like:

2012-02-03 11:24:24.295 Roster[31754:f803] Key: 7
2012-02-03 11:24:24.295 Roster[31754:f803] Dictionary: (null)
2012-02-03 11:24:24.296 Roster[31754:f803] FileName: (null)

If I change this line:

NSDictionary *dict = [self.roster objectForKey:[NSNumber numberWithInt:indexPath.row]];

to:

NSDictionary *dict = [self.roster objectForKey:@"5"];

Then all of the cells will have the correct fileName for the 6th element. Any idea why [NSNumber numberWithInt:indexPath.row isn't working?

回答1:

You can do this:

NSDictionary *dict = [self.roster objectForKey:indexPath.row];
NSString *fileName = [dict objectForKey:@"fileName"];

回答2:

As pointed out by Oscar, self.roster it's a NSDictionary wich have inside of him dictionaries for each numeric key.

You must first retrieve the NSDictionary for the numeric key: NSDictionary *fileDictionary = [self.roster objectForKey:indexPath.row];

After that you must extract your filename from this last dictionary so you must request the string for the @"fileName" key.

    NSString *fileName = [fileDictionary objectForKey:@"fileName"];
    cell.textLabel.text = fileName;
    return cell;

回答3:

No sure if you solved the problem already, but below is how I solved this issue.

NSDictionary *dict = 
[self.allItem objectForKey:[NSString stringWithFormat:@"%d",indexPath.row]];

I think the reason was [NSNumber numberWithInt:indexPath.row] is returning number/int value. But objectForKey: is expecting to receive a string value.

Hope this help.

来源：https://stackoverflow.com/questions/9130259/loading-plist-into-ios-tableview

标签

ios

uitableview

plist

nsdictionary