iOS 文件的三种储存方式

 文件的三种存储方式

1.归档形式

//     归档解档可以针对所有的对象 : 必须要遵守协议 NSCoding

NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];

NSString *flierPath = [path stringByAppendingString:@"abc.date"];

[NSKeyedArchiver archiveRootObject:person toFile:flierPath];

//归档

- (void)encodeWithCoder:(NSCoder *)aCoder {

    

    //    把_name转成啊\NSCoder类型

    [aCoder encodeObject:_name forKey:@"name"];    

    [aCoder encodeInteger:_age forKey:@"age"];

       

}

//解档

- (instancetype)initWithCoder:(NSCoder *)aDecoder{

    if ( self = [super init]) {

        self.name = [aDecoder decodeObjectForKey:@"name"];

        self.age = [aDecoder decodeIntegerForKey:@"age"];    

    }

    

    return self;

}

2.用户偏好

//存入文件

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

// 保存用户数据

    [defaults setObject:@"hju" forKey:@"name"];

    [defaults setInteger:18 forKey:@"age"];

    [defaults  setBool:YES forKey:@"123"];

//    写入完要同步

    [defaults synchronize];

//    取出文件

    NSString *name = [[NSUserDefaults standardUserDefaults]objectForKey:@"name"];

    NSInteger age = [[NSUserDefaults standardUserDefaults]integerForKey:@"age"];

    BOOL married = [[NSUserDefaults standardUserDefaults]boolForKey:@"123"];

3.plist文件

//查找文件

     NSString  *path = NSSearchPathForDirectoriesInDomains(        NSDocumentDirectory,  NSUserDomainMask, YES)[0];

//拼接文件名

    NSString *fliePath = [path stringByAppendingString:@"aa.plist"];

//  存入数组

    NSArray *array = @[@"123",@"12"];

    [array writeToFile:fliePath atomically:YES];

//    存入字典

    NSDictionary *dict = @{@"cc":@"ff"};

    [dict writeToFile:fliePath atomically:YES];

//读取

//    查找文件

    NSString  *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];

//    拼接路径

    NSString *fliePath = [path stringByAppendingString:@"aa.plist"];

//    读取文件

    NSDictionary *dict = [NSDictionary  dictionaryWithContentsOfFile:fliePath];