初级数据持有化-沙盒
//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