- (void)encodeWithCoder:(NSCoder *)coder{
//告诉系统归档的属性是哪些
unsigned int count = 0;//表示对象的属性个数
Ivar *ivars = class_copyIvarList([UserDataModel class], &count);
for (int i = 0; i<count; i++) {
//拿到Ivar
Ivar ivar = ivars[i];
const char *name = ivar_getName(ivar);//获取到属性的C字符串名称
NSString *key = [NSString stringWithUTF8String:name];//转成对应的OC名称
//归档 -- 利用KVC
[coder encodeObject:[self valueForKey:key] forKey:key];
}
free(ivars);//在OC中使用了Copy、Creat、New类型的函数,需要释放指针!!(注:ARC管不了C函数)
}
- (instancetype)initWithCoder:(NSCoder *)coder{
self = [super init];
if (self) {
//解档
unsigned int count = 0;
Ivar *ivars = class_copyIvarList([UserDataModel class], &count);
for (int i = 0; i<count; i++) {
//拿到Ivar
Ivar ivar = ivars[i];
const char *name = ivar_getName(ivar);
NSString *key = [NSString stringWithUTF8String:name];
//解档
id value = [coder decodeObjectForKey:key];
// 利用KVC赋值
[self setValue:value forKey:key];
}
free(ivars);
}
return self;
}
- (IBAction)save:(UIButton *)sender {
UserDataModel *person = [[UserDataModel alloc] init];
//这里以temp路径为例,存到temp路径下
NSString *temp = NSTemporaryDirectory();
NSString *filePath = [temp stringByAppendingPathComponent:@"obj.data"]; //注:保存文件的扩展名可以任意取,不影响。
NSLog(@"%@", filePath);
//归档
[NSKeyedArchiver archiveRootObject:person toFile:filePath];
}
- (IBAction)read:(UIButton *)sender {
//取出归档的文件再解档
NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"obj.data"];
//解档
UserDataModel *person = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
}
海到尽头天为岸
链接:https://www.jianshu.com/p/3e08fa21316d
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