NSDictionary的几种遍历方法：

1、NSEnumerator 

NSEnumerator* keyEnum = [iDictionary keyEnumerator];id key;for(key = [keyEnum nextObject]){   //do something;}

2、for key in ...

for (id key in iDictionary){  //do something}

3、NSDictionary allKeys

- (void)describeDictionary:(NSDictionary *dict){ NSArray *keys; int i, count; id key, value; keys = [dict allKeys]; count = [keys count]; for (i = 0; i < count; i++)　　{ 　　　　key = [keys objectAtIndex: i]; 　　　　value = [dict objectForKey: key]; 　　　　NSLog (@"Key: %@ for value: %@", key, value);　　}}