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iOS

Posted by TJ Rogers
TJ Rogers
8,758 Points

"What is NS Dictionary" Problem

Hi all, I'm having a problem with the NS Dictionary tutorial. Problem is this. I've followed the video's instructions, but got stuck on the part where you run the program in order to display three titles (at the 9:50 mark). When I run the program, only one title appears. Oddly the two rows below the title respond to being clicked. So clearly I've accomplished creating the three rows. But I've only populated one of them using NSDictionary and NSArray.

I've gone over the code numerous times to make certain that everything is exactly the way it should be. What am I missing? Here is my code in the TableViewController.m:

#import "TableViewController.h"

@interface TableViewController ()

@end

@implementation TableViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSDictionary *blogPost1 = [NSDictionary dictionaryWithObjectsAndKeys:@"The Missing Widget in Android",@"title", @"Ben Jakuben",@"author", nil];

    NSDictionary *blogPost2 = [NSDictionary dictionaryWithObjectsAndKeys:@"Getting Started with iOS Development",@"Title", @"Amit Bijlani",@"Author", nil];

    NSDictionary *blogPost3 = [NSDictionary dictionaryWithObjectsAndKeys:@"Some other Title", @"Title", @"Some Other Guy", @"Author", nil];


    self.blogPosts = [NSArray arrayWithObjects:blogPost1, blogPost2, blogPost3, nil];

}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return [self.blogPosts count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    NSDictionary *blogpost = [self.blogPosts objectAtIndex:indexPath.row];

    cell.textLabel.text = [blogpost valueForKey:@"title"];

    return cell;

}

@end

3 Answers

Stone Preston
Stone Preston
42,016 Points

your keys for the last two NSDictionary objects are @"Title" whereas the first one is @"title. that explains why only the first is being displayed since you call 

[blogpost valueForKey:@"title"];
Chris McKnight
PLUS
Chris McKnight
Courses Plus Student 11,045 Points
Chris McKnight
Chris McKnight
Courses Plus Student 11,045 Points

The keys for you dictionaries aren't consistent. You have @"title" for the first one and @"Title" for the other two so you have 2 cells that are blank. You can tell they are blank because you can tap on them and highlight them. You should also be consistent with your author key as well. The code below will resolve your issue.

NSDictionary *blogPost1 = [NSDictionary dictionaryWithObjectsAndKeys:@"The Missing Widget in Android",@"title", @"Ben Jakuben",@"author", nil];

    NSDictionary *blogPost2 = [NSDictionary dictionaryWithObjectsAndKeys:@"Getting Started with iOS Development",@"title", @"Amit Bijlani",@"author", nil];

    NSDictionary *blogPost3 = [NSDictionary dictionaryWithObjectsAndKeys:@"Some other Title", @"title", @"Some Other Guy", @"author", nil];
TJ Rogers
TJ Rogers
8,758 Points
TJ Rogers
TJ Rogers
8,758 Points

Thank you both for the prompt responses - that fixed it. I figured the issue was something small and "minor" - although I am quickly learning there is no such thing as a minor mistake in programming. Those small mistakes will kill your program just as easily as the big ones (and are far more insidious because they're harder to identify).

Thanks again!

Stone Preston
Stone Preston
42,016 Points

yeah that one took me a while to catch. I looked at all your code and everything looked good...then I saw it