NSMutableDictionary *mDict=[[NSMutableDictionary alloc]init];
NSMutableDictionary *mDict2=[[NSMutableDictionary alloc]init];
//later suppose you have 5 object in mDict and 2 object in mDict2. combine in this Way.
NSMutableArray *keys=[[NSMutableArray alloc]init];
NSMutableArray *obj=[[NSMutableArray alloc]init];
keys=[[mDict allKeys] mutableCopy];
obj=[[mDict allValues] mutableCopy];
[keys addObjectsFromArray:[mDict2 allKeys]];
[obj addObjectsFromArray:[mDict2 allValues]];
NSMutableDictionary *dict=[[NSMutableDictionary alloc]initWithObjects:obj forKeys:keys];
你想成为什么样的关键?也许我会误解你。 –