1. FastCoder，能够帮你存储你建立的模型和基本数据类型，它是NSUserDefaults的进一步封装。
2. FastCoding 减少了对自定义类时的<NScoding>协议书写

gitHub : FastCoding

需要设置：手动管理（-fno-objc-arc）

项目->Build Phases-> Compile Sources

下面类似的图

QQ20161205-0.jpg

接下来是用单例模式来本地存储数据

@interface Center : NSObject

+(instancetype)share;
-(void)storeValue:(id)value withKey:(NSString *)key;
-(id)valueWithKey:(NSString *)key;

#import "Center.h"
#import "FastCoder.h"

static Center *center =nil;

@implementation Center

+(instancetype)share{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        center = (Center *)@"Center"; //这是严格的单例模式书写
        center = [[Center alloc]init];
    });

    //防止子类使用
    NSString *classString = NSStringFromClass([self class]);
    if ([classString isEqualToString:@"Center"] == NO) {
        NSParameterAssert(nil);
    }
    return center;
}

-(instancetype)init{
    NSString *string = (NSString *)center;
    if ([string isKindOfClass:[NSString class]] && [string isEqualToString:@"Center"]) {
        self = [super init];
        if (self) {}
        return self;
    }else{
        return nil;
    }
}

-(void)storeValue:(id)value withKey:(NSString *)key{
    NSParameterAssert(value); //如果为空，将会报错。
    NSParameterAssert(key);
    NSData *data= [FastCoder dataWithRootObject:value];//FastCoder 的内容
    if (data) {
        [[NSUserDefaults standardUserDefaults]setObject:data forKey:key];
    }
}

-(id)valueWithKey:(NSString *)key{
    NSParameterAssert(key);
    NSData *data = [[NSUserDefaults standardUserDefaults]valueForKey:key];
    return [FastCoder objectWithData:data];
}

使用如下：

 [[Center share]storeValue:@{@"a":@"b"} withKey:@"key"];
 NSLog(@"%@",[[Center share]valueWithKey:@"key"]);

进一步的封装：

@interface NSObject (StoreValue)
-(void)storeValueWithKey:(NSString *)key;
+(id)valueBykey:(NSString *)key;
@end

#import "NSObject+StoreValue.h"
#import "Center.h"
@implementation NSObject (StoreValue)
-(void)storeValueWithKey:(NSString *)key{
    [[Center share]storeValue:self withKey:key];
}

+(id)valueBykey:(NSString *)key{
    return  [[Center share]valueWithKey:key];
}

使用如下：

  Student *student = [[Student alloc]init];
  [student storeValueWithKey:@"key"];
  Student *stu= [Student valueBykey:@"key"];