归档

ios数据存储之--对模型对象归档(NSKeyedArchiver、NSKeyedUnarchiver)

iOS/NSUserDefaults详解

 我要永远地记住你！（iOS中几种数据持久化方案）

• plist文件（属性列表）
• preference（偏好设置）
• NSKeyedArchiver（归档）
• SQLite 3
• CoreData

"应用程序包"    [[NSBundle mainBundle] bundlePath];
Documents      NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject;
Library    
    Caches     NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).firstObject;
    Preferences  
tmp             NSTemporaryDirectory();

plist:

NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject;
NSString *fileName = [path stringByAppendingPathComponent:@"123.plist"];

NSArray *array = @[@"123", @"456", @"789"];
[array writeToFile:fileName atomically:YES];

NSArray *result = [NSArray arrayWithContentsOfFile:fileName];
NSLog(@"%@", result);

Preference:

//1.获得NSUserDefaults文件
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

//2.向文件中写入内容
[userDefaults setObject:@"AAA" forKey:@"a"];
[userDefaults setBool:YES forKey:@"sex"];
[userDefaults setInteger:21 forKey:@"age"];
//2.1立即同步
[userDefaults synchronize];

//3.读取文件
NSString *name = [userDefaults objectForKey:@"a"];
BOOL sex = [userDefaults boolForKey:@"sex"];
NSInteger age = [userDefaults integerForKey:@"age"];

NSLog(@"%@, %d, %ld", name, sex, age);

NSKeyedArchiver:

遵循NSCoding协议

/1.遵循NSCoding协议 
  @interface Person : NSObject <NSCoding>

  //2.设置属性
  @property (strong, nonatomic) UIImage *avatar;
  @property (copy, nonatomic) NSString *name;
  @property (assign, nonatomic) NSInteger age;

  @end
//解档
  - (id)initWithCoder:(NSCoder *)aDecoder {
      if ([super init]) {
          self.avatar = [aDecoder decodeObjectForKey:@"avatar"];
          self.name = [aDecoder decodeObjectForKey:@"name"];
          self.age = [aDecoder decodeIntegerForKey:@"age"];
      }

      return self;
  }

  //归档
  - (void)encodeWithCoder:(NSCoder *)aCoder {
      [aCoder encodeObject:self.avatar forKey:@"avatar"];
      [aCoder encodeObject:self.name forKey:@"name"];
      [aCoder encodeInteger:self.age forKey:@"age"];
  }

NSString *file = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject stringByAppendingPathComponent:@"person.data"];

  Person *person = [[Person alloc] init];
  person.avatar = self.avatarView.image;
  person.name = self.nameField.text;
  person.age = [self.ageField.text integerValue];

  [NSKeyedArchiver archiveRootObject:person toFile:file];


NSString *file = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject stringByAppendingPathComponent:@"person.data"];

  Person *person = [NSKeyedUnarchiver unarchiveObjectWithFile:file];
  if (person) {
     self.avatarView.image = person.avatar;
     self.nameField.text = person.name;
     self.ageField.text = [NSString stringWithFormat:@"%ld", person.age];
  }

我要娶你做我的CoreData！