本文主要阐述Objective-C如何通过runtime反射获取方法并调用
属性和变量的反射遍历可以参考https://www.jianshu.com/p/1a03524d6668

引入头文件

#import <objc/runtime.h>

获取类实例方法

Class currentClass=NSClassFromString(@"DlibClass");
    do{
        unsigned int methodCount;
        
        Method *methodList = class_copyMethodList(currentClass, &methodCount);
        unsigned int i = 0;
        for (; i < methodCount; i++) {
            SEL sel=method_getName(methodList[i]);
            NSString *strClassName=[NSString stringWithCString:class_getName(currentClass) encoding:NSUTF8StringEncoding];
            NSString *strMethodName=[NSString stringWithCString:sel_getName(sel) encoding:NSUTF8StringEncoding];
            NSLog(@"class:%@ method:%@", strClassName,strMethodName);
        }
        
        free(methodList);
        currentClass = class_getSuperclass(currentClass);
        
    }while(currentClass);

获取类方法（静态方法）

    Class currentClass=objc_getMetaClass("DlibClass");
    do{
        unsigned int methodCount;
        
        Method *methodList = class_copyMethodList(currentClass, &methodCount);
        unsigned int i = 0;
        for (; i < methodCount; i++) {
            SEL sel=method_getName(methodList[i]);
            NSString *strClassName=[NSString stringWithCString:class_getName(currentClass) encoding:NSUTF8StringEncoding];
            NSString *strMethodName=[NSString stringWithCString:sel_getName(sel) encoding:NSUTF8StringEncoding];
            NSLog(@"class:%@ method:%@", strClassName,strMethodName);
        }
        
        free(methodList);
        currentClass = class_getSuperclass(currentClass);
    
        
    }while(currentClass);

反射创建类实例

 Class Dcls=NSClassFromString(@"DlibClass");
 id dobj=[[Dcls alloc] init];

反射创建无类实例(也叫类对象)

 Class currentClass=objc_getMetaClass("DlibClass");
 id dclsobj=[[currentClass alloc] init];

根据@selector调用相应对象方法

 IMP imp = [dobj methodForSelector:sel];
MyClass *(*func)(void) = (void *)imp;
MyClass *ret=func();
NSLog(@"%@",ret);