Use objective-C's Runtime

Because nsobject in the foundation of cocoa framework provides the javasmselector method, only two data parameters can be passed. To pass more parameters, one of the simplest methods is to use RuntimeIDObjc_msgsend (ID Self,SelOp,...) runtime function.

To add the declaration of the runtime function, the header file must be included in OS X:# Import<Objc/objc-runtime.h>; in iOS, the header file must be included: # import <objc/runtime. h>

The variable parameter after the objc_msgsend method must be of the ID type, and cannot be other user-defined struct, union, or other types, or basic types, such as floating point numbers, otherwise, the data is incomplete. Therefore, nsnumber should be used to convert integers or floating-point numbers.