NSUserDefault 保存自定义对象

由于NSUserDefaults 不支持保存自定类,保存的对象需要实现NSCoding协议,不过自定的类型就算实现了NSCoding也不可以保存,可以通过以下方法实现:

//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

通过实现

NSKeyedArchiver转换成NSData然后保存到NSUserDefaults中,然后取值的时候可以通过NSKeyedUnarchiver读NSData获得对应的user,代码如下:

NSUserDefaults *userDefault= [NSUserDefaults standardUserDefaults];

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

     p.name = @"张飞";

　　  p.age = @"";

    //将对象转化为字节流

    NSData *data = [NSKeyedArchiver archivedDataWithRootObject: p];

    [userDefault setObject:data forKey:@"user"];

    //同步

    [nsuser synchronize];

    //获取

    NSData *getdata =[nsuser objectForKey:@"user"];

    //解码

    People *getP = [NSKeyedUnarchiver unarchiveObjectWithData:getdata];

    NSLog(@"%@",getP.name);

巴特西

NSUserDefault 保存自定义对象

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