iOS dynamic run-time methods

At some point, the program may need to determine the method to invoke based on the parameters obtained.

To implement such a function, you need to use the dynamic runtime method.

You first need to define the interface so that it can be called.

Then there is the dynamic invocation of the defined method.

Here are two ways to

The first type:

// with parameters, you need to add a colon Sel sel = nsselectorfromstring (@ "Save:"new];[ obj Performselector:sel withobject:@{@ "1":@ "One" }];

Using the first method, the program appears with a warning.

Second: (called using method Pointers)

MyObject obj = [MyObjectNew]; Sel sel= Nsselectorfromstring (@"Save:"); Imp imp=[obj Methodforselector:sel];/** ID Object * Method of SEL Object * parameter of ID method*/    void(*func) (ID, SEL,ID) = (void*) Imp;

Or you can write that.

((Void (*) (ID, SEL, id)) [obj Methodforslector:sel]) (obj, sel, @{@ "1": @ "one"}); Func (manager, SEL, @{@"1":@" One"});

In addition, the skilled use of ID types is very important.

NSString *param =@"{\"Mm\": \ "iosqiao\", \ "yhm\": \ "123456\"}"; IDobj =[nsjsonserialization jsonobjectwithdata:[param datausingencoding:nsutf8stringencoding] options:< /c2>0Error:nil]; MyObject*manager = [MyObjectNew]; if(!manager) {    return; } SEL sel= Nsselectorfromstring (@"Savestorage:"); IMP Imp=[manager Methodforselector:sel]; void(*func) (ID, SEL,ID) = (void*) Imp; Func (Manager, SEL, obj);

iOS dynamic run-time methods