我定义了一个Person类作为测试。
其中Person.h：
//
// Person.h
// Test
//
// Created by zhanggui on 15/8/16.
// Copyright (c) 2015年 zhanggui. All rights reserved.
// #import <Foundation/Foundation.h>
#import <UIKit/UITabBar.h>
@protocol PersonDelete <NSObject> - (void)protocolMethod1;
- (void)protocolMethod2; @end
@interface Person : NSObject<UITabBarDelegate> @property (nonatomic,copy)NSString *name;
@property (nonatomic,assign)NSUInteger age;
@property (nonatomic,copy)NSString *address;
- (void)personRun;
- (void)eat;
- (void)goToSchool:(NSString *)vehicle; + (void)method1;
@end
Person.m:
//
// Person.m
// Test
//
// Created by zhanggui on 15/8/16.
// Copyright (c) 2015年 zhanggui. All rights reserved.
// #import "Person.h" @implementation Person - (void)personRun {
NSLog(@"run method was called");
}
- (void)eat {
NSLog(@"eat method was called");
}
- (void)goToSchool:(NSString *)vehicle {
NSLog(@"Person go to school by %@",vehicle);
}
+ (void)method1 {
NSLog(@"类方法");
}
@end
然后集中在ViewController中的viewDieLoad方法中测试：(具体的讲解都在注释中了)
- (void)viewDidLoad {
[super viewDidLoad];
Person *person = [[Person alloc] init];
unsigned int outCount = ;
Class cls = person.class; //得到Person的class
//--------------------类名
NSLog(@"类名是 :%s",class_getName(cls));
//-----------父类
NSLog(@"父类名是:%s",class_getName(class_getSuperclass(cls)));
//是否是元类
if (class_isMetaClass(cls)) {
NSLog(@"Person是元类");
}else
{
NSLog(@"Person不是元类");
}
//返回指定类的元类
Class meta_class = objc_getMetaClass(class_getName(cls));
NSLog(@"%ss 的元类 是 %s",class_getName(cls),class_getName(meta_class));
//变量实例大小 %zu用来输出size_t类型的。
NSLog(@"实例大小：:%zu",class_getInstanceSize(cls));
//成员变量 Iavr:一个不透明的类型代表实例变量。这里可以得到其所有的成员变量
Ivar *ivars = class_copyIvarList(cls, &outCount);
for (int i=;i<outCount;i++)
{
Ivar ivar = ivars[i];
NSLog(@"实例变量的名字：%s at index %d",ivar_getName(ivar),i);
}
free(ivars); //释放成员变量实例
//通过名字：获取指定的实例变量，，比如我想获取该类是否有_name这个变量就可以通过该方法获得。
Ivar string = class_getInstanceVariable(cls, "_name");
if (string!=NULL) {
NSLog(@"%s有实列变量：%s",class_getName(cls),ivar_getName(string));
}else
{
NSLog(@"%s没有指定的实列变量：%s",class_getName(cls),ivar_getName(string));
}
//属性操作:objc_porperty：代表公开的属性.class_getProperty的参数中：cls代表该类的class，name是该类的属性
objc_property_t array = class_getProperty(cls, "name");
if (array!=NULL) {
NSLog(@"属性：%s",property_getName(array));
}
//方法操作：
Method *methods = class_copyMethodList(cls, &outCount);
for (int i=; i<outCount; i++) {
Method method = methods[i];
NSLog(@"方法签名是：%s",sel_getName(method_getName(method))); //sel_getName:得到方法名字
}
free(methods); //释放methods所占用的内存
// typedef struct objc_method *Method;
//这里得到的是类方法
// struct objc_method {
// SEL method_name OBJC2_UNAVAILABLE;
// char *method_types OBJC2_UNAVAILABLE;
// IMP method_imp OBJC2_UNAVAILABLE;
// }
//IMP
Method classMethod = class_getClassMethod(cls, @selector(method1));
if (classMethod!=NULL) {
NSLog(@"%s 有该类方法：%s",class_getName(cls),sel_getName(method_getName(classMethod)));
}else
{
NSLog(@"%s 没有该类方法：%s",class_getName(cls),sel_getName(method_getName(classMethod)));
}
//判断类的实例是否相应某个方法：比如alloc就不响应，而init就相应
if (class_respondsToSelector(cls, @selector(alloc))) {
NSLog(@"Person实例 响应 alloc");
}else
{
NSLog(@"Person实例 不响应 alloc");
}
//函数指针
IMP imp = class_getMethodImplementation(cls, @selector(eat));
imp();
//获得该类具有的协议
Protocol *__unsafe_unretained * protocols = class_copyProtocolList(cls, &outCount);
Protocol *protocol;
for (int i=; i<outCount; i++) {
protocol = protocols[i];
NSLog(@"协议名称：%s",protocol_getName(protocol));
}
//判断是否遵守协议
if (class_conformsToProtocol(cls, protocol)) {
NSLog(@"Person遵守协议%s",protocol_getName(protocol));
}else
{
NSLog(@"Person不遵守协议%s",protocol_getName(protocol));
}
}附：
参考与：http://southpeak.github.io/blog/2014/10/25/objective-c-runtime-yun-xing-shi-zhi-lei-yu-dui-xiang/