如何在iOS Mantle模型子类中设置默认值

时间:2014-04-14 15:34:27

标签: ios objective-c github-mantle

@interface Entity ()
  @property (assign) int searchTotalPagesAll;
  @property (assign) int searchTotalPagesIdeas;
@end


@implementation Entity
  + (NSDictionary *)JSONKeyPathsByPropertyKey {
return @{
         @"Id": @"entity.id_entity",
         @"name": @"entity.name",
         @"coverage" : @"entity.coverage",
         @"id_city": @"entity.Id_City",
         @"cityName":@"entity.city",
         @"countryName":@"entity.country",
         @"stateName":@"entity.district",
         @"countryCode": @"entity.countrycode",
         @"keyword1": @"entity.key1",
      ... etc

由于mantle示例没有init方法,我应该在哪里初始化这些属性(searchTotalPagesAll,searchTotalPagesIdeas)以获取默认值?此模型具有需要此内容和其他几个属性的内部方法。

2 个答案:

答案 0 :(得分:13)

无论您是使用JSON还是其他方式创建Mantle模型,都会使用[-initWithDictionary:error:]初始化模型。在模型类中,您可以将默认值添加到用于初始化模型的值:

- (instancetype)initWithDictionary:(NSDictionary *)dictionaryValue error:(NSError *__autoreleasing *)error {
    NSDictionary *defaults = @{
        @"searchTotalPagesAll" : @(10),
        @"searchTotalPagesIdeas" : @(5)
    };
    dictionaryValue = [defaults mtl_dictionaryByAddingEntriesFromDictionary:dictionaryValue];
    return [super initWithDictionary:dictionaryValue error:error];
}

答案 1 :(得分:9)

您可以在init方法中设置默认值。

- (instancetype)init
{
    self = [super init];
    if (self) {
        self.searchTotalPagesAll = 1;
        self.searchTotalPagesIdeas = 2;
    }
    return self;
}