字典中使用NSDictionaryOfVariableBindi

NSDictionaryOfVariableBindings这个宏生成一个字典,这个宏可以生成一个变量名到变量值映射的Dictionary,比如:

NSNumber * packId=@(2);

NSNumber *userId=@(22);

NSNumber *proxyType=@(2);

NSDictionary *param=NSDictionaryOfVariableBindings(packId,userId,proxyType);