objective-c底层: runtime机制

unsigned int count;
//获取属性列表
objc_property_t *propertyList = class_copyPropertyList([self class], &count);
for (unsigned int i=; i<count; i++) {
const char *propertyName = property_getName(propertyList[i]);
NSLog(@"property---->%@", [NSString stringWithUTF8String:propertyName]);
} //获取方法列表
Method *methodList = class_copyMethodList([self class], &count);
for (unsigned int i; i<count; i++) {
Method method = methodList[i];
NSLog(@"method---->%@", NSStringFromSelector(method_getName(method)));
} //获取成员变量列表
Ivar *ivarList = class_copyIvarList([self class], &count);
for (unsigned int i; i<count; i++) {
Ivar myIvar = ivarList[i];
const char *ivarName = ivar_getName(myIvar);
NSLog(@"Ivar---->%@", [NSString stringWithUTF8String:ivarName]);
} //获取协议列表
__unsafe_unretained Protocol **protocolList = class_copyProtocolList([self class], &count);
for (unsigned int i; i<count; i++) {
Protocol *myProtocal = protocolList[i];
const char *protocolName = protocol_getName(myProtocal);
NSLog(@"protocol---->%@", [NSString stringWithUTF8String:protocolName]);
}

Class clazz = Person.class;
unsigned int count = ;Person *person = [[Person alloc]init];
NSDictionary *dict = @{@"name":@"zhangsan",@"age":@, @"height": @1.75};Ivar *ivars = class_copyIvarList(clazz, &count);
for (int i = ; i < count; i++) {
const char *cname = ivar_getName(ivars[i]);
NSString *name = [NSString stringWithUTF8String:cname];
NSString *key = [name substringFromIndex:]; const char *coding = ivar_getTypeEncoding(ivars[i]); // 获取类型
NSString *strCode = [NSString stringWithUTF8String:coding];
id value = dict[key];
if ([strCode isEqualToString:@"f"]) {// 判断类型是否是float
value = @(0.0);
} [person setValue:value forKey:key];
}
NSLog(@"%@", person);

- (void)encodeWithCoder:(NSCoder *)aCoder {
unsigned int count = ;
Ivar *ivars = class_copyIvarList(self.class, &count);
for (int i = ; i < count; i++) {
const char *cname = ivar_getName(ivars[i]);
NSString *name = [NSString stringWithUTF8String:cname];
NSString *key = [name substringFromIndex:]; id value = [self valueForKey:key]; // 取出key对应的value
[aCoder encodeObject:value forKey:key]; // 编码
}
}
- (id)initWithCoder:(NSCoder *)aDecoder {
if (self = [super init]) {
unsigned int count = ;
Ivar *ivars = class_copyIvarList(self.class, &count);
for (int i = ; i < count; i++) {
const char *cname = ivar_getName(ivars[i]);
NSString *name = [NSString stringWithUTF8String:cname];
NSString *key = [name substringFromIndex:]; id value = [aDecoder decodeObjectForKey:key]; // 解码
[self setValue:value forKey:key]; // 设置key对应的value
}
}
return self;
}