初级数据持有化-沙盒

来源：互联网发布：中药软件哪个好使编辑：程序博客网时间：2024/05/22 00:36

//获取沙盒主路径

/*NSString *homePath=NSHomeDirectory();

NSLog(@"%@",homePath);

//获取document:通常用来存放应用程序需要持久化使用的关键数据，比如本地数据库等 iTunes在备份的时候会自动备份此文件夹

NSString *documentPath=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

NSLog(@"%@",documentPath);

//library:通常存储用来应用程序运行期间生成的持久化数据，比如用户账户等。应用程序退出后不会被删除，但是 iTunes 备份时不会备份此文件夹.

NSString *library=[NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)firstObject];

NSLog(@"%@",library);

//cache:运行期间的缓存文件：历史记录等

NSString *cachePath=[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject];

NSLog(@"%@",cachePath);

//preferences ：应用程序的设置：夜间模式等

//tmp：存放临时文件，应用程序结束后清除

NSString *tmp=NSTemporaryDirectory();

NSLog(@"%@",tmp);

//Bundle

//获取当前的应用程序包

NSBundle *bundle=[NSBundle mainBundle];

//获取当前包的路径

// NSString *bundlePath=[bundle resourcePath];

//或者

NSString *bundlePath=[bundle bundlePath];

NSLog(@"%@",bundlePath);

//获取包内的文件内容

NSString *imgPath=[bundle pathForResource:@"dog" ofType:@"png"];

NSLog(@"%@",imgPath);

NSString *interfacePath=[bundle pathForResource:@"蓝鸥接口文档" ofType:@"txt"];

NSLog(@"%@",interfacePath);*/

//写入文件

//简单对象的写入文件 :数组，字典，字符串，NSData

//字符串写入文件

/* NSString *incantation=@"I love you very much.Do you love me?";

NSString *path=NSHomeDirectory();

path=[path stringByAppendingString:@"/zgc.txt"];

//写入文件的方法

[incantation writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:nil];

//从文件获取文件

NSString *resultString=[NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

NSLog(@"%@",resultString);*/

//数组写入文件

/*NSArray *array=@[@"项链想念被相亲",@"一生一世一双人"];

NSString *path=NSHomeDirectory();

path =[path stringByAppendingString:@"/王安石.txt"];

//写入文件

[array writeToFile:path atomically:YES];

//读取文件

NSArray *result=[NSArray arrayWithContentsOfFile:path];

NSLog(@"%@",result[0]);*/

//字典写入文件

/*NSDictionary *dict=@{@"周哥问:":@"我漂亮吗?",

@"我答:":@"NO"};

NSString *path=NSHomeDirectory();

path =[path stringByAppendingString:@"/周哥.txt"];

//写入文件

[dict writeToFile:path atomically:YES];

NSDictionary *dic=[NSDictionary dictionaryWithContentsOfFile:path];

NSLog(@"%@",dic);*/

//图片写入文件

/*UIImage *image=[UIImage imageNamed:@"dog.png"];

NSData *data=UIImageJPEGRepresentation(image, 1);

NSString *path=NSHomeDirectory();

path=[path stringByAppendingString:@"/图片.png"];

//写入文件

[data writeToFile:path atomically:YES];

//取出图片

NSData *result=[NSData dataWithContentsOfFile:path];

UIImage *resultImage=[UIImage imageWithData:data];*/

#pragma mark --复杂对象写入文件-----

/*Person *person=[Person new];

person.name=@"MisserSar";

person.gender=@"man";

NSString *path=NSHomeDirectory();

path=[path stringByAppendingString:@"/person.txt"];

//创建可变data，用来存放归档数据

NSMutableData *mutData=[[NSMutableData alloc]initWithCapacity:10];

//创建归档对象

NSKeyedArchiver *archiver=[[NSKeyedArchiver alloc]initForWritingWithMutableData:mutData];

//归档

[archiver encodeObject:person forKey:@"person"];

//完成归档

[archiver finishEncoding];

//写入文件

[mutData writeToFile:path atomically:YES];

//使用data对象获取数据

NSData *data=[NSData dataWithContentsOfFile:path];

//创建反归档对象

NSKeyedUnarchiver *unchiver=[[NSKeyedUnarchiver alloc]initForReadingWithData:data];

//反归档

Person *person1= [unchiver decodeObjectForKey:@"person"];

//完成反归档

[unchiver finishDecoding];

NSLog(@"%@,%@",person.name,person1.name);*/

//数据持久化的方式

//1. 属性列表

//2. NSUserDefaults

//3. write to file

//4. sqlite

//5. Core data

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