NSDictionary值/对象的关键？

Question

我们可以NSDictionary通过传递特定值或对象来获取对象的关键字吗？

Answer 1

-[NSDictionary allKeysForObject:]返回NSArray其对象与传递的对象匹配的所有键中的一个,其中"匹配"由...确定isEqual:.

Answer 2

要以更具体的方式回答您的问题,请使用以下内容获取特定对象的密钥:

NSString *knownObject = @"the object";
NSArray *temp = [dict allKeysForObject:knownObject];
NSString *key = [temp lastObject];

//"key" is now equal to the key of the object you were looking for