ios - 无法更新单例类中的属性

Question

我有一个像这样声明的单例类:

+(instancetype)mySharedClass
{
    static BBDataStore *sharedBBDataStore = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedBBDataStore = [[self alloc]initWithDataExpiry:DATA_EXPIRY_TIME];
    });
    return sharedBBDataStore;
}

-(instancetype)initWithDataExpiry: (int) dataExpiry
{
    if (self = [super initWithDataExpiry:dataExpiry])
        {

        self.categoryWebServicePool = [[NSMutableDictionary alloc]init];
        self.userProfileWebServicePool = [[NSMutableDictionary alloc]init];

        }
    return self;
}

在这个类中，我声明了一个公共(public)属性:

@property (assign, nonatomic) int countryId;

现在当我像这样从另一个类设置这个属性时:

[[BBDataStore sharedDataStore]setCountryId:1];

我的自定义 setter 在单例类中运行:

-(void)setCountryId:(int)countryId
{
    switch (countryId)
    {
        case RE_INDEX:
            self.serverString = RE_SERVER_STRING;
            self.authId = BB_AUTH_SA_ID;

        break;
        case KE_INDEX:
           self.serverString = KE_SERVER_STRING;
           self.authId = BB_AUTH_KENYA_ID;

        break;
    }

}

但是 self.countryId 始终保持为 0，并且从不更改其值。我在这里做错了什么？

Answer 1

您的自定义 setter 方法实际上不会更改基础 ivar 的值。这应该有效。

-(void)setCountryId:(int)countryId
{
    _countryId = countryId;
    switch (countryId)
    {
        case RE_INDEX:
            self.serverString = RE_SERVER_STRING;
            self.authId = BB_AUTH_SA_ID;

        break;
        case KE_INDEX:
           self.serverString = KE_SERVER_STRING;
           self.authId = BB_AUTH_KENYA_ID;

        break;
    }
}