Question

关于NSDictionary 怎样取得值所对应的key

NSDictionary* dic = [NSDictionary dictionaryWithObjects:(id*)values forKeys:(id*)keys count:3];我有一个 NSDictionary 已经知道怎样通过key返回 value。用 objectForKey现在怎样用value查得对应的key 是啥。谢谢～那么 objectForKey 是用key返回值。怎么用值反回key呢？

Answer 1

for (int j = 0; j<=[[jsonDic allKeys]count]-1; j++) { if ([[jsonDic objectForKey:[[jsonDic allKeys]objectAtIndex:j]] isEqual:查找的对象]) { [[jsonDic allKeys] objectAtIndex:j]; } }