如何在iOS Mantle模型子类中设置默认值

@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.

解决方法

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];
}