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 = 0; 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=0;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=0; 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=0; 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/
时间: 2024-10-09 20:09:59