Accessing values contained in IOS Arrays and Dictionaries

Question

I am having difficulty understanding how to access values within Arrays using Objective-C My Array looks like this:

bualadhBos = @[
               @{ @"time":[NSNumber numberWithInt:2875],
                  @"line" : @"Muid uilig ag bualadh bos, "},
               @{ @"time":[NSNumber numberWithInt:3407],
                  @"line": @"Muid uilig ag tógáil cos, "},
               @{ @"time":[NSNumber numberWithInt:3889],
                  @"line": @"Muid ag déanamh fead ghlaice, "},
               @{ @"time": [NSNumber numberWithInt:4401],
                  @"line": @"Muid uilig ag geaibíneacht. "},
               @{ @"time":[NSNumber numberWithInt:4900],
                  @"line": @"Buail do ghlúine 1, 2, 3, "},
               @{ @"time":[NSNumber numberWithInt:5383],
                  @"line": @"Buail do bholg mór buí, "},
               @{ @"time" :[NSNumber numberWithInt:5910],
                  @"line": @"Léim suas, ansin suigh síos, "},
               @{ @"time": [NSNumber numberWithInt:6435],
                  @"line": @"Seasaigh suas go hard arís. "},
               @{ @"time":[NSNumber numberWithInt:6942],
                  @"line": @"Sín amach do dhá lamh, "},
               @{ @"time": [NSNumber numberWithInt:7430],
                  @"line": @"Anois lig ort go bhfuil tú ' snámh. "},
               @{ @"time": [NSNumber numberWithInt:7934],
                  @"line": @"Amharc ar dheis, ansin ar chlé, "},
               @{ @"time":[NSNumber numberWithInt:8436],
                  @"line": @"Tóg do shúile go dtí an spéir. "},
               @{ @"time": [NSNumber numberWithInt:8940],
                  @"line": @"Tiontaigh thart is thart arís, "},
               @{ @"time": [NSNumber numberWithInt:9436],
                  @"line": @"Cuir síos do dhá lámh le do thaobh, "},
               @{ @"time": [NSNumber numberWithInt:9942],
                  @"line": @"Lámha suas is lúb do ghlúin, "},
               @{ @"time": [NSNumber numberWithInt:10456],
                  @"line": @"Suigí síos anois go ciúin. "},
               ];

And I'm iterating over the array like so:

 [player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:NULL usingBlock:^(CMTime time){
        NSTimeInterval seconds = CMTimeGetSeconds(time);
        for (NSObject *item in bualadhBos) {
            NSLog(@"Seconds: %qi", seconds);  
            NSLog(@"item: %qi", [item valueForKey:@"time"]);                
      }

The Output that I receive from this is like this:

2014-09-23 21:43:03.485 IciApp[1001:239870] item: 1683166570951200528
2014-09-23 21:43:03.486 IciApp[1001:239870] Seconds: 4617316992953529383
2014-09-23 21:43:03.486 IciApp[1001:239870] item: 1683489071455597664
2014-09-23 21:43:03.487 IciApp[1001:239870] Seconds: 4617316992953529383
2014-09-23 21:43:03.488 IciApp[1001:239870] item: 1683292602471563696
2014-09-23 21:43:03.488 IciApp[1001:239870] Seconds: 4617316992953529383

I'm not sure why The item lines are not printing out the values that are in the array? Or is it, and I just don't understand the way it's converted the number? It looks to me like it is printing out the id of the object and not the value of time. I am hoping to see 2875 printed as the first value for item.

Also I'm pretty confused by the Seconds value as well. Is it the value in milliseconds?

Many thanks

rmaddy · Accepted Answer · 2014-09-23T21:09:19.463

1

You are logging the NSNumber pointer as a long long. Try this:

for (NSDictionary *item in bualadhBos) {
    NSLog(@"Seconds: %f", seconds);
    NSNumber *time = item[@"time"];
    NSLog(@"time: %qi", [time longLongValue]);
}

edited Sep 23 '14 at 21:09

answered Sep 23 '14 at 20:54

rmaddy

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Thanks - that's helped me a lot. Just need to figure out what the Seconds are now. Very confused that it's such a big number. – Linda Keating Sep 23 '14 at 21:05
I just updated my answer. I change how `seconds` is logged. `NSTimeInterval` is a `double`, not a `long long`. See if that helps. – rmaddy Sep 23 '14 at 21:09
that makes a lot more sense thanks. I've a lot to learn in Objective-C – Linda Keating Sep 23 '14 at 21:16

Accessing values contained in IOS Arrays and Dictionaries

1 Answers1