初级数据持久化

NSArray * arr =  NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
    NSLog(@"%@",arr);

    //1.NSString 写入文件
    //1.1获取document文件夹路径
//    NSString * docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
//    NSLog(@"%@",docPath);
//    //1.2在document路径下创建user.txt文件路径
//    NSString * filePath = [docPath stringByAppendingString:@"/user.txt"];
//    //1.3将字符串写入文件
//    NSString * userName = @"zhangsan";
//    [userName writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
//    //从文件读取内容
//    NSString * str = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
//    NSLog(@"%@",str);
 

//2.数组写入文件
    //获取document文件夹路径
//    NSString * docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
//    NSLog(@"%@",docPath);
//    //2.2在document文件夹下创建arr.txt文件路径.以下两种方式都可以
//    NSString * filePath = [docPath stringByAppendingPathComponent:@"arr.txt"];
////    NSString * filePath = [docPath stringByAppendingString:@"/arr.txt"];
//    //2.3创建数组写入文件。
//    NSArray * arr = @[@"zhangsan",@"lisi",@"hehe",@"lili"];
//    [arr writeToFile:filePath atomically:YES];

   //3.字典写入文件
    //3.1获取document路径
//    NSString * docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
//    //3.2在document 文件夹下创建dic.aaa文件
//    NSString * filePath = [docPath stringByAppendingPathComponent:@"dic.aaa"];
//    //3.3创建字典写入文件
//    NSDictionary * dic = @{@"name": @"张三",@"sex":@"男",@"age":@"23"};
//    [dic writeToFile:filePath atomically:YES];

//    //4.NSData写入文件
//    NSString * Path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
//    NSLog(@"%@",Path);
//    NSString * dataPath = [Path stringByAppendingPathComponent:@"data.txt"];
//    UIImage * img = [UIImage imageNamed:@"1.png"];
//   NSData * data = UIImagePNGRepresentation(img);
//    
//    [data writeToFile:dataPath atomically:YES];

@interface User : NSObject<NSCoding> 遵循协议

@property(nonatomic,copy)NSString * name;
@property(nonatomic,copy)NSString * pwd;
@property(nonatomic,assign) int  status;

#import "User.h"

@implementation User

-(void)dealloc
{
    [_name release];
    [_pwd release];
    [super dealloc];
}
//归档时调用，对属性进行编码
- (void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:self.name forKey:@"name"];
    [aCoder encodeObject:self.pwd forKey:@"pwd"];
    [aCoder encodeInt:self.status forKey:@"status"];
    
}
//在返归档时调用，从data数据中解码属性。
- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super init];
    if (self) {
        self.name = [aDecoder decodeObjectForKey:@"name"];
        self.pwd = [aDecoder decodeObjectForKey:@"pwd"];
        self.status = [aDecoder decodeIntForKey:@"status"];
    }
    return self;
}
@end

//    User * usr = [[User alloc]init];
//    usr.name = @"李四";
//    usr.pwd = @"212343";
    //归档
//    //1.创建MutableData对象用于接收归档数据
//    NSMutableData * muldata = [NSMutableData data];
//    //2.创建归档类。
//    NSKeyedArchiver * archiver = [[NSKeyedArchiver alloc]initForWritingWithMutableData:muldata];
//    //3.开始归档（编码）
//    [archiver encodeObject:usr forKey:@"usr"];
//    //4.结束编码，将编码数据写到muldata中。
//    [archiver finishEncoding];
//    NSLog(@"%@",muldata);

//1.创建反归档类
//    NSKeyedUnarchiver * unArchiver = [[NSKeyedUnarchiver alloc]initForReadingWithData:muldata];
//    //2.开始解码。
//   User * deUsr = [unArchiver decodeObjectForKey:@"usr"];
//    //3.完成解码。
//    [unArchiver finishDecoding];
//    NSLog(@"%@ %@ %d",deUsr.name,deUsr.pwd,deUsr.status);

//    //归档。
//    NSString * filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject]stringByAppendingString:@"/archive.txt"];
//    [NSKeyedArchiver archiveRootObject:usr toFile:filePath];//    //反归档、
//    User * test = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
//    NSLog(@"-------%@ %@ %d",test.name,test.pwd,test.status);

//创建文件管理器。
    NSFileManager * manager = [NSFileManager defaultManager];
    NSString * docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
    NSLog(@"%@",docPath);
    //创建起始文件夹。
    NSString * newPath = [docPath stringByAppendingString:@"/new"];
    [manager createDirectoryAtPath:newPath withIntermediateDirectories:YES attributes:nil error:nil];
    //在起始文件夹里创建文件。
    NSString * filePath = [newPath stringByAppendingString:@"/new.txt"];
    NSString * str = @"mini";
    [str writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
    //创建目的地文件夹
    NSString * aimPath = [docPath stringByAppendingString:@"/aim"];
    [manager createDirectoryAtPath:aimPath withIntermediateDirectories:YES attributes:nil error:nil];
    //创建目的地文件。
    NSString * strPath = [aimPath stringByAppendingString:@"/new.txt"];
    BOOL isres= [manager removeItemAtPath:strPath error:nil];
    if (isres) {
        NSLog(@"删除成功");
    }else{
        NSLog(@"删除失败");
    }
  
    BOOL isCopy = [manager copyItemAtPath:filePath toPath:strPath error:nil];
    if (isCopy) {
        NSLog(@"复制成功");
    }else{
        NSLog(@"复制失败");
    }
    BOOL isre= [manager removeItemAtPath:strPath error:nil];
    if (isre) {
        NSLog(@"删除成功");
    }else{
        NSLog(@"删除失败");
    }
    BOOL isMove = [manager moveItemAtPath:filePath toPath:strPath error:nil];
    if (isMove) {
        NSLog(@"移动成功");
    }else{
        NSLog(@"移动未成功");
    }