非常使用NSSortDescriptor的自定义订单 [英] Very custom order using NSSortDescriptor

问题描述

假设我有不同状态的对象。状态从0到2.我需要使用NSSortDescriptor以这种方式对它们进行排序：

Let's say I have objects with different statuses. Statuses are from 0 to 2. I need to sort them using NSSortDescriptor in this way:

1

2

0

有什么建议吗？

推荐答案

像这样（未经测试）：

descriptor = [[[NSSortDescriptor alloc]
          initWithKey:@"status"
          ascending:YES
          selector:@selector(customStatusCompare:)] autorelease];

@interface NSNumber (CustomStatusCompare)
- (NSComparisonResult)customStatusCompare:(NSNumber*)other;
@end

@implementation NSNumber (CustomStatusCompare)
- (NSComparisonResult)customStatusCompare:(NSNumber*)other {
  NSAssert([other isKindOfClass:[NSNumber class]], @"Must be a number");
  if ([self isEqual:other]) {
    return NSOrderedSame;
  }
  else if (... all your custom comparison logic here ...)
  }
}

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