@selector parameter delivery for iOS development

Like what:

Nsmutabledictionary *dic = [[Numutabledictionary alloc]init];

[dic setvalue:@ "haha" forkey:@ "test"]

[Nstimer scheduledtimerwithtimeintervatal:2.0 target:self selector:

@selecrtor (onTimer:) userinfo:dic Repeats:no];

On the above call OnTimer: How to pass arguments, there may be a question here, I only know the method name, how do I know what type of argument to pass. In fact, it is very simple to pass the parameters of the Nstimer object, from the object of the Nstimer object can get the userinfo in the DIC, so as to remove the data in DIC.

Therefore, OnTimer: the implementation of the method must be as follows (the parameter must be of type OnTimer):

-(void) OnTimer: (Nstimer *) timer{

.............................

}

@selector parameter delivery for iOS development