第一次看到runtime时，觉得太高大上，动态获取方法、属性等简直厉害的不要不要的。在经过查找资料+实践后，发现runtime并没有想象中那么复杂，接下来对runtime进行基本的介绍。
要使用运行时方法需要引入runtime.h文件
一、基础知识
Method ：成员方法
Ivar : 成员变量
二、常用方法
class_copyPropertyList : 获取属性列表
class_copyMethodList : 获取成员方法列表
class_copyIvarList：获取成员变量列表
ivar_getName：获取变量名
property_getName：获取属性名
使用示例：
1.获取成员变量列表
//1.获取变量list
unsigned int ivarCount = ; //成员变量数
Ivar *ivarList = class_copyIvarList([self class], &ivarCount);//ivar数组 for (int i = ; i < ivarCount; i++) {//遍历
Ivar ivar = ivarList[i]; //获取ivar
const char *name = ivar_getName(ivar);//获取变量名
NSString *key = [NSString stringWithUTF8String:name];
NSLog(@"%@", key); } free(ivarList);
2.获取属性列表
unsigned int count = ;
objc_property_t *propertList = class_copyPropertyList([self class], &count);
for (int i = ; i < count; i++) {
objc_property_t property = propertList[i];
const char *name = property_getName(property);
const char *attrs = property_getAttributes(property);
// property_copyAttributeValue(,) 第一个参数为objc_property_t,第二个参数"V"获取变量名,"T"获取类型
const char *value = property_copyAttributeValue(property, "V");
NSLog(@"name = %s, attrs = %s, value = %s", name, attrs, value);
}
free(propertList);
3.获取方法列表
unsigned int count = ;
Method *methodList = class_copyMethodList([self class], &count);
for (int i = ; i < count; i++) {
Method method = methodList[i];
SEL selector = method_getName(method);//方法入口
const char *sel_name = sel_getName(selector);
NSLog(@"方法名 %s", sel_name);
}
free(methodList);
三、使用方向：归档、字典<---->模型、框架封装等
实现归档
#define WKCodingImplementing \
- (void)encodeWithCoder:(NSCoder *)aCoder \
{ \
unsigned int ivarCount = ; \
Ivar *ivarList = class_copyIvarList([self class], &ivarCount); \
for (int i = ; i < ivarCount; i++) { \
Ivar ivar = ivarList[i]; \
const char *name = ivar_getName(ivar); \
const char *type = ivar_getTypeEncoding(ivar); \
NSLog(@"%s-----%s", name, type); \
NSString *key = [NSString stringWithUTF8String:name]; \
id value = [self valueForKey:key]; \
[aCoder encodeObject:value forKey:key]; \
} \
free(ivarList); \
} \
- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder \
{ \
if (self = [super init]) { \
unsigned int ivarCount = ; \
Ivar *ivarList = class_copyIvarList([self class], &ivarCount); \
for (int i = ; i < ivarCount; i++) { \
Ivar ivar = ivarList[i]; \
const char *name = ivar_getName(ivar); \
NSString *key = [NSString stringWithUTF8String:name]; \
NSLog(@"%@ %@", key, value); \
id value = [aDecoder decodeObjectForKey:key]; \
[self setValue:value forKey:key]; \
} \
} \
return self; \
}