IOS中的数据存储 简单总结

  1.  NSKeyedArchiver（加密形式）

  2.  plist

  3.  NSUserDefaults

  4.  writeToFile 

  5.  SQLite3

==== NSKeyedArchiver ========================================

-------CKPerson.h 代码

@interface CKPerson : NSObject

@property (nonatomic, copy) NSString *name;

@property (nonatomic, assign) int age;

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

- (id)initWithCoder:(NSCoder *)aDecoder;

@end

------- CKPerson.m 代码

- (void)encodeWithCoder:(NSCoder *)aCoder

{

    [aCoder encodeObject:self.name forKey:@"name"];

    [aCoder encodeInteger:self.age forKey:@"age"];

}

- (id)initWithCoder:(NSCoder *)aDecoder

{

    if(self = [super init])

    {

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

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

    }

    return self;

}

---------- CKViewController.m

- (IBAction)OnSaveDataClick:(UIButton *)sender {

    CKPerson *p = [[CKPerson alloc] init];

    p.name = @"GoldenKey";

    p.age = 21;

    

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

    NSString *fileName = filePath = [docPath stringByAppendingPathComponent:@"student.hehe"];

    [NSKeyedArchiver archiveRootObject:p toFile:filePath]; //保存数据

}

- (IBAction)OnGetDataClick:(UIButton *)sender {

     CKPerson *p = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath]; //获取数据

}

==== plist存取 array、dictionary ===================================

- (IBAction)OnArraySaveClick:(UIButton *)sender {

    NSArray *testArray = @[@"111",@"121",@"131",@"141",@"151"];

    [testArray writeToFile:self.path4Array atomically:YES];

}

- (IBAction)OnArrayGetClick:(UIButton *)sender {

    NSArray *testArray = [NSArray arrayWithContentsOfFile:self.path4Array];

    NSLog(@"数组长度为%d",[testArray count]);

}

- (IBAction)OnDictionarySaveClick:(UIButton *)sender {

    NSDictionary *dict = @{@"name":@"key",@"age":@12};

    [dict writeToFile:self.path4Dict atomically:YES];

}

- (IBAction)OnDictionaryGetClick:(UIButton *)sender {

    NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:self.path4Dict];

    NSLog(@"name:%@",dict[@"name"]);

    NSLog(@"age:%@",dict[@"age"]);

}

==== NSUserDefaults 程序票号设置 =================================

    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

    

    [userDefaults setInteger:1 forKey:@"testInt"];

    [userDefaults synchronize];

    

    int i = [userDefaults integerForKey:@"testInt"];

    NSLog(@"i=%d",i);

    //-----------

    

    NSString *name = @"GoldenKey";

    [userDefaults setObject:name forKey:@"name"];

    [userDefaults synchronize];

    

    NSString *nameResult = [userDefaults objectForKey:@"name"];

    NSLog(@"%@",nameResult);

==== writeToFile ============================================

    --读取string----------------------------------------------------

    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask,YES);

    NSString *ourDocumentPath =[documentPaths objectAtIndex:0];

    

    //第二步：生成在该路径下的文件：

    NSString *FileName=[ourDocumentPath stringByAppendingPathComponent:@"test.hehe"];

    NSString *texts = @"test string";

    NSData *data = [texts dataUsingEncoding:NSUTF8StringEncoding];

    [data writeToFile:FileName atomically:YES];//将NSData类型对象data写入文件，文件名为FileName

    

    

    //读取方式1

    //NSData *dataResult=[NSData dataWithContentsOfFile:FileName options:0 error:NULL];//从FileName中读取出数据

    //NSString *strResult = [[NSString alloc] initWithData:dataResult encoding:NSUTF8StringEncoding];

    

    //读取方式2

    NSString *strResult = [NSString stringWithContentsOfFile:FileName encoding:NSUTF8StringEncoding error:nil];

    NSLog(@"%@",strResult);

    

    //--存取dictionary-------------------------------------------

    

    NSString *dictFileName = [ourDocumentPath stringByAppendingPathComponent:@"dict.hehe"];

    NSDictionary *dictTest = @{@"name":@"GoldenKey",@"age":@24};

    NSData *dictData = [NSJSONSerialization dataWithJSONObject:dictTest options:NSJSONWritingPrettyPrinted error:nil];

    [dictData writeToFile:dictFileName atomically:YES];

    

    NSData *dataResult = [NSData dataWithContentsOfFile:dictFileName];

    NSDictionary *dictResult = [NSJSONSerialization JSONObjectWithData:dataResult options:NSJSONReadingMutableContainers error:nil];

    NSLog(@"name = %@",dictResult[@"name"]);

==== sqlite3 ========================================================