Declaration and implementation of variable parameter methods in IOS

Ns_requires_nil_termination, for compile-time non-NIL end checks-(void) Mutableargumentsfunction: (NSString *) arg1, ... ns_requires_nil_termination{    //defines a pointer to an optional parameter list    va_list args;        Gets the address of the first optional parameter, at which point the argument list pointer points to the first optional parameter in the function argument list    va_start (args, arg1);    if (arg1)    {        //iterates through the parameters in the parameter list and causes the argument list pointer to point to the next parameter in the parameter list        nsstring *nextarg;        while ((Nextarg = Va_arg (args, NSString *))        {            NSLog (@ "ARG:%@", Nextarg);}    }    Ends the Get (empty argument list) of the mutable parameter    va_end (args);}

Special attention:

1. variable parameters can only be the last one in all parameters

2.ns_requires_nil_termination, for compile-time non-NIL end inspection

Application Scenarios:

1. Please refer to this method when rewriting Uialertview

2. Rewrite NSLog

Declaration and implementation of variable parameter methods in IOS