NSUserDefault 保存自定義對象

 

因爲NSUserDefaults 不支持保存自定類,保存的對象須要實現NSCoding協議,不過自定的類型就算實現了NSCoding也不能夠保存,能夠經過如下方法實現:

//h文件
#import <Foundation/Foundation.h>

@interface People : NSObject<NSCoding>

@property(nonatomic,copy)NSString *name;
@property(nonatomic,copy)NSString *age;

@end

//m文件

#import "People.h"

@implementation People

- (void)encodeWithCoder:(NSCoder *)aCoder{
    [aCoder encodeObject:_name forKey:@"name"];
    [aCoder encodeObject:_age forKey:@"age"];
    
}
- (id)initWithCoder:(NSCoder *)aDecoder{
    _name= [aDecoder decodeObjectForKey:@"name"] ;
    _age= [aDecoder decodeIntegerForKey:@"age"];
    return self;
}
@end

 

 

經過實現

NSKeyedArchiver轉換成NSData而後保存到NSUserDefaults中,而後取值的時候能夠經過NSKeyedUnarchiver讀NSData得到對應的user,代碼以下:

NSUserDefaults *userDefault= [NSUserDefaults standardUserDefaults];
    People *p = [[People alloc]init];
     p.name = @"張飛";
　　  p.age = @"32";
    //將對象轉化爲字節流
    NSData *data = [NSKeyedArchiver archivedDataWithRootObject: p];
    
    [userDefault setObject:data forKey:@"user"];
    //同步
    [nsuser synchronize];

    //獲取
    NSData *getdata =[nsuser objectForKey:@"user"];
    //解碼
    People *getP = [NSKeyedUnarchiver unarchiveObjectWithData:getdata];
  
    
    NSLog(@"%@",getP.name);