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copied!<h2>Compare method</h2> <p>Either you implement a compare-method for your object:</p> <pre><code>- (NSComparisonResult)compare:(Person *)otherObject { return [self.birthDate compare:otherObject.birthDate]; } NSArray *sortedArray = [drinkDetails sortedArrayUsingSelector:@selector(compare:)]; </code></pre> <h2>NSSortDescriptor (better)</h2> <p>or usually even better:</p> <pre><code>NSSortDescriptor *sortDescriptor; sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"birthDate" ascending:YES]; NSArray *sortedArray = [drinkDetails sortedArrayUsingDescriptors:@[sortDescriptor]]; </code></pre> <p>You can easily sort by multiple keys by adding more than one to the array. Using custom comparator-methods is possible as well. Have a look at <a href="https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSSortDescriptor_Class/Reference/Reference.html" rel="noreferrer">the documentation</a>.</p> <h2>Blocks (shiny!)</h2> <p>There's also the possibility of sorting with a block since Mac OS X 10.6 and iOS 4:</p> <pre><code>NSArray *sortedArray; sortedArray = [drinkDetails sortedArrayUsingComparator:^NSComparisonResult(id a, id b) { NSDate *first = [(Person*)a birthDate]; NSDate *second = [(Person*)b birthDate]; return [first compare:second]; }]; </code></pre> <h1>Performance</h1> <p>The <code>-compare:</code> and block-based methods will be quite a bit faster, in general, than using <code>NSSortDescriptor</code> as the latter relies on KVC. The primary advantage of the <code>NSSortDescriptor</code> method is that it provides a way to define your sort order using data, rather than code, which makes it easy to e.g. set things up so users can sort an <code>NSTableView</code> by clicking on the header row.</p>

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