如何检查一个 NSDictionary 或 NSMutableDictionary 是否包含一个键？

Question

I need to check if an dict has a key or not. How?

转载于:https://stackoverflow.com/questions/2784648/how-to-check-if-an-nsdictionary-or-nsmutabledictionary-contains-a-key

Answer 1

objectForKey will return nil if a key doesn't exist.