NSArray 排序方法的实现

最新推荐文章于 2025-08-20 11:47:50 发布

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最新推荐文章于 2025-08-20 11:47:50 发布

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文章标签：操作系统

原文链接：http://www.cnblogs.com/neozhu/archive/2013/04/02/2996369.html

本文介绍了在Objective-C中实现对象排序的多种方式，包括通过实现compare方法、使用NSSortDescriptor及自定义比较块来完成对数组的排序。这些方法能够帮助开发者更加灵活地处理数据排序需求。

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Compare method

Either you implement a compare-method for your object:

-(NSComparisonResult)compare:(Person*)otherObject {return[self.birthDate compare:otherObject.birthDate];}NSArray*sortedArray;
sortedArray =[drinkDetails sortedArrayUsingSelector:@selector(compare:)];

NSSortDescriptor (better)

or usually even better:

NSSortDescriptor*sortDescriptor;
sortDescriptor =[[[NSSortDescriptor alloc] initWithKey:@"birthDate"
                                              ascending:YES] autorelease];NSArray*sortDescriptors =[NSArray arrayWithObject:sortDescriptor];NSArray*sortedArray;
sortedArray =[drinkDetails sortedArrayUsingDescriptors:sortDescriptors];

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 the documentation.

Blocks (shiny!)

There's also the possibility of sorting with a block since Mac OS X 10.6 and iOS 4:

NSArray*sortedArray;
sortedArray =[drinkDetails sortedArrayUsingComparator:^NSComparisonResult(id a, id b){NSDate*first =[(Person*)a birthDate];NSDate*second =[(Person*)b birthDate];return[first compare:second];}];