Databases
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    <p>When determining whether an object exists in a set of objects, consider using an <a href="http://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSSet_Class/Reference/Reference.html" rel="nofollow"><code>NSSet</code></a>/<a href="http://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSMutableSet_Class/Reference/NSMutableSet.html#//apple_ref/occ/cl/NSMutableSet" rel="nofollow"><code>NSMutableSet</code></a> object (or <a href="http://developer.apple.com/library/mac/documentation/Foundation/Reference/NSOrderedSet_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40009980-CH2-DontLinkElementID_1" rel="nofollow"><code>NSOrderedSet</code></a>/<a href="http://developer.apple.com/library/mac/documentation/Foundation/Reference/NSMutableOrderedSet_Class/Reference/Reference.html#//apple_ref/occ/cl/NSMutableOrderedSet" rel="nofollow"><code>NSMutableOrderedSet</code></a> if you are developing for Mac OS X 10.7 or iOS 5.0 and want to retain the order of elements in the set). An <code>NSSet</code> container is designed for efficient lookups. When an object has a decent <code>hash</code> (which most Foundation objects do), the lookup is effectively O(1), which is faster than a binary search. </p> <pre><code>NSSet *dateSet = [NSSet setWithArray:dateArray]; if ([dateSet containsObject:date1]) { // do something } </code></pre> <p>Note that it is important to construct the set once rather than converting it from an array each time, or else you'll lose any performance benefit.</p> <p>For more information, see <a href="http://developer.apple.com/library/mac/documentation/cocoa/conceptual/Collections/Articles/Sets.html" rel="nofollow">here</a>.</p> <hr> <p>Since you are wanting to check for specified dates regardless of time, you need to truncate the date values <em>before</em> adding them to the set. For example (pick better names, this is only an example):</p> <pre><code>// potentially add as a category method to NSDate - (NSDate *) dateByTruncatingTime { NSDateComponents *components = [[NSCalendar currentCalendar] components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:aDate]; return [[NSCalendar currentCalendar] dateFromComponents:components]; } // ------------- somewhere else ------------- - (void) actionHappened { [myMutableSet addObject:[[NSDate date] dateByTruncatingTime]]; } - (BOOL) didActionHappenOnDate:(NSDate *) aDate { return [myMutableSet containsObject:[aDate dateByTruncatingTime]]; } </code></pre>
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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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