#import <UIKit/UIKit.h>

 @interface LQAnimal : NSObject <NSCoding>

 @property (strong) NSString *animalType;

 @end

 #import "LQAnimal.h"

 @implementation LQAnimal

 @synthesize animalType = _animalType;

 /*

  *从未归档数据中，初始化对象

  */

 - (id) initWithCoder:(NSCoder *) theCoder

 {

     LQAnimal *what = [[LQAnimal alloc] init];

     what.animalType = [theCoder decodeObjectForKey:@"type"];

     return what;

 }

 /*

  *归档时，编码

  */

 - (void) encodeWithCoder:(NSCoder *)theCoder

 {

     [theCoder encodeObject:self.animalType forKey:@"type"];

 }

 @end

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

    NSString *detailPath = [NSString stringWithFormat:@"%@/animal.txt",path];

    LQAnimal *animal = [[LQAnimal alloc] init];

    //animal.animalType = @" little fat sheep ";

    animal.animalType = @" big fat sheep ";

    BOOL isOK = [NSKeyedArchiver archiveRootObject:animal toFile:detailPath];

    if (isOK) {

        NSLog(@"save object success!");

        LQAnimal *getAnimal = [NSKeyedUnarchiver unarchiveObjectWithFile:detailPath];

        NSLog(@"APP get animal type:%@", getAnimal.animalType);

    } else{

        NSLog(@"save object fail！");

    }

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