writeToFile 读写文件问题

关于 writeToFile 读写文件:当字典中键值对以 Model(例如:studentModel)为值时发现 Dictionary 调用 writeToFile 方法无法生成 plist 文件,经过多次测试发现, 调用 writeToFile 方法时 Dictionary 中不能包含 model 对象,针对这一现象,对 model 数据进行处理转化为 Dictionary ,就可以存储为 plist 文件.当读取 plist 文件时再将 Dictionary 转化为 Model.

下面是以 studentModel 为例实现代码:

studentModel 包含三个属性:name,passWord,sex

 

@property (nonatomic , copy)NSString *name; 2 @property (nonatomic , copy)NSString *passWord; 3 @property (nonatomic , copy)NSString *sex;

 

 

 

为studentModel 添加以实例方法,完成将 Model 对象转为  Dictionary

- (NSMutableDictionary *)changeModelToDic{ 2     NSMutableDictionary *dic = [[NSMutableDictionary alloc]init]; 3     [dic setObject:self.name forKey:@"name"]; 4     [dic setObject:self.passWord forKey:@"passWord"]; 5     [dic setObject:self.sex forKey:@"sex"]; 6     return dic; 7 }

为studentModel 添加类方法.完成将 Dictionary 转化为 Model 对象

+ (Student*)changDicToStudent:(NSMutableDictionary *)dic{ 2     Student *stu = [[Student alloc]init]; 3     stu.name = [dic objectForKey:@"name"]; 4     stu.passWord = [dic objectForKey:@"passWord"]; 5     stu.sex = [dic objectForKey:@"sex"]; 6     return stu; 7 }