利用runtime加深对基础知识的理解
如果对runtime需要学习,可以看这篇,以下仅作为学习笔记,相互交流。
runtime的头文件:
#import <objc/runtime.h> //*> 对方法、变量、属性和类别的方法
#import <objc/message.h> //*> 消息转发的方法
1.获取OC类的变量名、属性名、方法
首先介绍三个函数:
class_copyIvarList()
class_copyPropertyList()
class_copyMethodList()
警告:使用以上三个方法没用的时候必须要free()掉。通过下面代码进行分析
/*
首先,创建集成NSObject的Person对象,然后在Person.h写入:
@interface People : NSObject
@property (nonatomic, strong) NSString * name;
@property (nonatomic, assign) BOOL Number;
@end
然后在AppDelegate.m写入一下代码,进行测试。
*/
unsigned int count = 0;
unsigned int count2 = 0;
unsigned int count3 = 0;
Ivar * ivars = class_copyIvarList([People class], &count);
Method * methods = class_copyMethodList([People class], &count2);
objc_property_t * propertys = class_copyPropertyList([People class], &count3);
for (int i = 0; i < count; i++)
{
Ivar ivar = ivars[i];
const char * ivarname = ivar_getName(ivar);
NSString * key = [NSString stringWithUTF8String:ivarname];
NSLog(@"%@",key);
}
NSLog(@"\n");
for (int i = 0; i < count3; i++)
{
objc_property_t property = propertys[i];
const char * propertyname = property_getName(property);
NSString * key = [NSString stringWithUTF8String:propertyname];
NSLog(@"%@",key);
}
NSLog(@"\n");
for (int i = 0; i< count2; i++)
{
Method method = methods[i];
SEL methodname = method_getName(method);
NSString * key = NSStringFromSelector(methodname);
NSLog(@"%@",key);
}
// free(ivars);
// free(methods);
// free(propertys);
/*
如果不写上面三行free(),就会出现内存泄露,如下图
*/
打印结果:
2016-03-23 14:39:56.167 测试1[2491:974748] _Number
2016-03-23 14:39:56.168 测试1[2491:974748] _name
2016-03-23 14:39:56.168 测试1[2491:974748]
2016-03-23 14:39:56.168 测试1[2491:974748] name
2016-03-23 14:39:56.168 测试1[2491:974748] Number
2016-03-23 14:39:56.168 测试1[2491:974748]
2016-03-23 14:39:56.169 测试1[2491:974748] Number
2016-03-23 14:39:56.169 测试1[2491:974748] .cxx_destruct
2016-03-23 14:39:56.170 测试1[2491:974748] dealloc
2016-03-23 14:39:56.170 测试1[2491:974748] name
2016-03-23 14:39:56.170 测试1[2491:974748] setName:
2016-03-23 14:39:56.170 测试1[2491:974748] init
2016-03-23 14:39:56.171 测试1[2491:974748] setNumber: