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：
1
2
0
有什么建议？
解决方法
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 ...)
}
}