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PO
 

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    <p>The <a href="http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/Foundation/Classes/NSDictionary_Class/Reference/Reference.html" rel="noreferrer">NSDictionary</a> and <a href="http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/Foundation/Classes/NSMutableDictionary_Class/Reference/Reference.html#//apple_ref/occ/cl/NSMutableDictionary" rel="noreferrer">NSMutableDictionary</a> docs are probably your best bet. They even have some great examples on how to do various things, like...</p> <p><strong>...create an NSDictionary</strong></p> <pre><code>NSArray *keys = [NSArray arrayWithObjects:@"key1", @"key2", nil]; NSArray *objects = [NSArray arrayWithObjects:@"value1", @"value2", nil]; NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];</code></pre> <p><strong>...iterate over it</strong></p> <pre><code>for (id key in dictionary) { NSLog(@"key: %@, value: %@", key, [dictionary objectForKey:key]); }</code></pre> <p><strong>...make it mutable</strong></p> <pre><code>NSMutableDictionary *mutableDict = [dictionary mutableCopy];</code></pre> <p><em>Note: historic version before 2010: [[dictionary mutableCopy] autorelease]</em></p> <p><strong>...and alter it</strong></p> <pre><code>[mutableDict setObject:@"value3" forKey:@"key3"];</code></pre> <p><strong>...then store it to a file</strong></p> <pre><code>[mutableDict writeToFile:@"path/to/file" atomically:YES];</code></pre> <p><strong>...and read it back again</strong></p> <pre><code>NSMutableDictionary *anotherDict = [NSMutableDictionary dictionaryWithContentsOfFile:@"path/to/file"];</code></pre> <p><strong>...read a value</strong></p> <pre><code>NSString *x = [anotherDict objectForKey:@"key1"]; </code></pre> <p><strong>...check if a key exists</strong></p> <pre><code>if ( [anotherDict objectForKey:@"key999"] == nil ) NSLog(@"that key is not there"); </code></pre> <p><strong>...use scary futuristic syntax</strong></p> <p><em>From 2014 you can actually just type dict[@"key"] rather than [dict objectForKey:@"key"]</em></p>
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    1. POHow can we store into an NSDictionary? What is the difference between NSDictionary and NSMutableDictionary?
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    1. PTAnswer
    1. USFattie
    1. USTim
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    1. POHow can we store into an NSDictionary? What is the difference between NSDictionary and NSMutableDictionary?
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    1. VO
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      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. This table or related slice is empty.
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    3. VO
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    1. COSorry, that last comment was a bit snarky. Thanks for pointing it out.
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    2. COI didn't see it, so you're good! :)
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      1. USjtbandes
    3. COCorrect...There was a leak
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      1. USPradeep Reddy Kypa
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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