iOS数据持久化--归解档

目标：向沙盒中存储一个自定义的对象 例如model类
方案：使用归解档
还是直接上代码吧，说明性文字实在弱项

1.使用归解档 需要遵守一个协议 <NSCoding> 这里的age属性为什么要声明成NSNumber类型 主要是为了后面的runtime .h

#import <Foundation/Foundation.h>

@interface PYHModel : NSObject<NSCoding>

@property (nonatomic, copy) NSString *name;
@property (nonatomic, strong) NSNumber *age;
@property (nonatomic, strong) NSNumber *sex;
@property (nonatomic, copy) NSString *address;

- (instancetype)initWithDict:(NSDictionary *)dict;
@end

2.实现协议方法 这里我用了一个runtime 偷个懒不用所有属性都写一遍 .m

- (NSArray *)allPropertyKey {
    if (!_allPropertyKey) {
        NSMutableArray *pps = [NSMutableArray array];
        
        //获取当前类所有属性 进行初始化
        unsigned int outCount = 0;
        objc_property_t *models = class_copyPropertyList([self class], &outCount);//获取所有属性
        for (unsigned int i = 0; i < outCount; i ++) {
            objc_property_t model = models[i];//获取指定下标属性
            NSString *propertyKey = [NSString stringWithUTF8String:property_getName(model)];
            [pps addObject:propertyKey];
        }
        free(models);
        
        _allPropertyKey = pps.copy;
    }
    return _allPropertyKey;
}

//解档
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super init]) {
        [self.allPropertyKey enumerateObjectsUsingBlock:^(NSString * _Nonnull propertyKey, NSUInteger idx, BOOL * _Nonnull stop) {
            id propertyValue = [aDecoder decodeObjectForKey:propertyKey];
            [self setValue:propertyValue forKey:propertyKey];
        }];
    }
    return self;
}

//归档
- (void)encodeWithCoder:(NSCoder *)aCoder {
    [self.allPropertyKey enumerateObjectsUsingBlock:^(NSString * _Nonnull propertyKey, NSUInteger idx, BOOL * _Nonnull stop) {
        id propertyValue =  [self valueForKey:propertyKey];
        [aCoder encodeObject:propertyValue forKey:propertyKey];
    }];
}

3.当然进行归解档也是需要调用一个api的

//归档 写入沙盒  系统方法
PYHModel *model = [[PYHModel alloc]initWithDict:@{@"name":@"pyh",@"address":@"hangzhoubingjiang",@"age":@28,@"sex":@"1"}];
BOOL result = [NSKeyedArchiver archiveRootObject:model toFile:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject stringByAppendingPathComponent:@"model"]];
NSLog(@"%@",result ? @"归档成功" : @"归档失败");

//解档  从沙盒读取对象 系统方法
PYHModel *model = [NSKeyedUnarchiver unarchiveObjectWithFile:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject stringByAppendingPathComponent:@"model"]];
NSLog(@"%@",model);

到这归解档的使用就结束了
demo：https://github.com/DeepSeaGhost/archiver