IOS数据持久化--归档

归档和解档是数据持久化的一种方法，下面我们通过代码来学习一下

归档

  //    UIView *v = [[UIView alloc]initWithFrame:CGRectMake(100, 100, 200, 200)];
    //    v.backgroundColor = [UIColor purpleColor];
    //    [self.view addSubview:v];


    //通过归档把v 转成NSData
    //    NSData *viewData = [NSKeyedArchiver archivedDataWithRootObject:v];
    //    
    //    [viewData writeToFile:@"/Users/tarena/Desktop/view.arch" atomically:YES];

    //简写
    //    [NSKeyedArchiver archiveRootObject:v toFile:@"/Users/tarena/Desktop/view2.arch"];

解档：

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    //把nsdata转回对象 （解档）
    //    NSData *data = [NSData dataWithContentsOfFile:@"/Users/tarena/Desktop/view.arch"];
    //    UIView *view = [NSKeyedUnarchiver unarchiveObjectWithData:data];
    //    

    UIView *view = [NSKeyedUnarchiver unarchiveObjectWithFile:@"/Users/tarena/Desktop/view.arch"];
    [self.view addSubview:view];

}