Ios 在singleton类中初始化后数组为零

我有一个单例类，我初始化了两个数组，如下所示

- (id)init {
if (self = [super init]) {

        //----------------- request Array -------------------

    // obj 00
    listRequestArr=[[NSMutableArray alloc]init];
    NSMutableDictionary *tratype=[[NSMutableDictionary alloc]init];
    [tratype setValue: [NSNumber numberWithInt:-1] forKey:@"ride_type_id"];
    [tratype setValue: [NSNumber numberWithInt:0] forKey:@"request_id"];
    [listRequestArr addObject:tratype];

    // obj 01
    NSMutableDictionary *ridename=[[NSMutableDictionary alloc]init];
    [ridename setValue: @"" forKey:@"ride_name"];
    [listRequestArr addObject:ridename];

    // obj 02
    NSMutableDictionary *rideprice=[[NSMutableDictionary alloc]init];
    [rideprice setValue: @"" forKey:@"ride_price"];
    [rideprice setValue: @"-1" forKey:@"ride_cid"];
    [rideprice setValue: @"" forKey:@"ride_price_name"];
    [listRequestArr addObject:rideprice];

    // obj 03
    NSMutableDictionary *reqdesc=[[NSMutableDictionary alloc]init];
    [reqdesc setValue: @"" forKey:@"request_desc"];
    [listRequestArr addObject:reqdesc];

    // obj 04
    NSMutableDictionary *modesoft=[[NSMutableDictionary alloc]init];
    [modesoft setValue: @"" forKey:@"modes_str"];
    [listRequestArr addObject:modesoft];

    // obj 05
    NSMutableDictionary *origindes=[[NSMutableDictionary alloc]init];
    [origindes setValue: @"" forKey:@"origin_add"];
    [origindes setValue:nil forKey:@"origin_placemark"];
    [origindes setValue: @"" forKey:@"des_add"];
    [origindes setValue:nil forKey:@"des_placemark"];
    [listRequestArr addObject:origindes];

    // obj 06
    NSMutableDictionary *availability=[[NSMutableDictionary alloc]init];
    [availability setValue: @"" forKey:@"ret_or_one_way"];
    [availability setValue: @"" forKey:@"depdate1"];
    [availability setValue: @"" forKey:@"depdate2"];
    [availability setValue: @"" forKey:@"retdate1"];
    [availability setValue: @"" forKey:@"retdate2"];
    [listRequestArr addObject:availability];

    // obj 07
    NSMutableDictionary *passengers=[[NSMutableDictionary alloc]init];
    [passengers setValue: @"0" forKey:@"adult"];
    [passengers setValue: @"0" forKey:@"child"];
    [passengers setValue: @"0" forKey:@"infants"];
    [listRequestArr addObject:passengers];




    requestCompletion=[[NSMutableArray alloc]init];
    for (NSInteger i = 0; i < 10; i++)
        [requestCompletion addObject:[NSNumber numberWithInteger:0]];




     return self;


}

这发生在我完成webservice调用时。在完成web服务调用后，如果我开始发出另一个请求，尽管我执行了dm=[Datamanager sharedmanager]，这两个数组仍然为零；似乎它没有初始化我在

Datamanager

类中所做的操作。这是什么原因？请帮帮我。第一次有效，但第二次无效，我将它们设置为零

---

谢谢

当应用程序上线时，Singleton只允许使用一次。在第一次调用后，将其设置为alloc，然后再次将其设置为nil。所以第二次：还是零。这很正常。你应该检查它为零，然后重新分配

两种可能的解决方案：

1） 您不需要单例，每个视图控制器都可以使用自己的设置，因此只需设置一次

2） 您希望销毁singleton实例，并为此目的公开一个方法reinit（）或clear（）

使用您的代码，可能的“reset（）”方法是：

- (id)init {
if (self = [super init]) {
     [self reset];
     return self;
}

-(void) reset {
        //----------------- request Array -------------------

    // obj 00
    listRequestArr=[[NSMutableArray alloc]init];
    NSMutableDictionary *tratype=[[NSMutableDictionary alloc]init];
    [tratype setValue: [NSNumber numberWithInt:-1] forKey:@"ride_type_id"];
    [tratype setValue: [NSNumber numberWithInt:0] forKey:@"request_id"];
    [listRequestArr addObject:tratype];

    // obj 01
    NSMutableDictionary *ridename=[[NSMutableDictionary alloc]init];
    [ridename setValue: @"" forKey:@"ride_name"];
    [listRequestArr addObject:ridename];

    // obj 02
    NSMutableDictionary *rideprice=[[NSMutableDictionary alloc]init];
    [rideprice setValue: @"" forKey:@"ride_price"];
    [rideprice setValue: @"-1" forKey:@"ride_cid"];
    [rideprice setValue: @"" forKey:@"ride_price_name"];
    [listRequestArr addObject:rideprice];

    // obj 03
    NSMutableDictionary *reqdesc=[[NSMutableDictionary alloc]init];
    [reqdesc setValue: @"" forKey:@"request_desc"];
    [listRequestArr addObject:reqdesc];

    // obj 04
    NSMutableDictionary *modesoft=[[NSMutableDictionary alloc]init];
    [modesoft setValue: @"" forKey:@"modes_str"];
    [listRequestArr addObject:modesoft];

    // obj 05
    NSMutableDictionary *origindes=[[NSMutableDictionary alloc]init];
    [origindes setValue: @"" forKey:@"origin_add"];
    [origindes setValue:nil forKey:@"origin_placemark"];
    [origindes setValue: @"" forKey:@"des_add"];
    [origindes setValue:nil forKey:@"des_placemark"];
    [listRequestArr addObject:origindes];

    // obj 06
    NSMutableDictionary *availability=[[NSMutableDictionary alloc]init];
    [availability setValue: @"" forKey:@"ret_or_one_way"];
    [availability setValue: @"" forKey:@"depdate1"];
    [availability setValue: @"" forKey:@"depdate2"];
    [availability setValue: @"" forKey:@"retdate1"];
    [availability setValue: @"" forKey:@"retdate2"];
    [listRequestArr addObject:availability];

    // obj 07
    NSMutableDictionary *passengers=[[NSMutableDictionary alloc]init];
    [passengers setValue: @"0" forKey:@"adult"];
    [passengers setValue: @"0" forKey:@"child"];
    [passengers setValue: @"0" forKey:@"infants"];
    [listRequestArr addObject:passengers];




    requestCompletion=[[NSMutableArray alloc]init];
    for (NSInteger i = 0; i < 10; i++)
        [requestCompletion addObject:[NSNumber numberWithInteger:0]];
}

---

设置

dm.listRequestArr=nil，您想要什么？因为我想在完成某些操作后刷新我的表视图，所以我不清楚您的问题<代码>dm=[Datamanager sharedmanager]；dm.listRequestArr=nil因此
listRequestArr
将为零。你有什么问题？我在关闭viewcontroller时将其设置为零。当我重新打开视图控制器时，我想像第一次一样重新初始化这两个数组为什么需要一个单例呢？为什么不直接使用Factory我怎么能破坏singleton实例？我想你用过dispatch_一次吧？（尽管代码未粘贴）。只需添加一个方法即可_sharedInstance=[[Datamanager alloc]init]您可以从init中取出代码并调用它setup方法，然后从init调用setup，但也可以公开setup，以便您可以在任何时候执行它。这很粗糙，但为了简单起见，请检查修改后的答案
- (id)init {
if (self = [super init]) {
     [self reset];
     return self;
}

-(void) reset {
        //----------------- request Array -------------------

    // obj 00
    listRequestArr=[[NSMutableArray alloc]init];
    NSMutableDictionary *tratype=[[NSMutableDictionary alloc]init];
    [tratype setValue: [NSNumber numberWithInt:-1] forKey:@"ride_type_id"];
    [tratype setValue: [NSNumber numberWithInt:0] forKey:@"request_id"];
    [listRequestArr addObject:tratype];

    // obj 01
    NSMutableDictionary *ridename=[[NSMutableDictionary alloc]init];
    [ridename setValue: @"" forKey:@"ride_name"];
    [listRequestArr addObject:ridename];

    // obj 02
    NSMutableDictionary *rideprice=[[NSMutableDictionary alloc]init];
    [rideprice setValue: @"" forKey:@"ride_price"];
    [rideprice setValue: @"-1" forKey:@"ride_cid"];
    [rideprice setValue: @"" forKey:@"ride_price_name"];
    [listRequestArr addObject:rideprice];

    // obj 03
    NSMutableDictionary *reqdesc=[[NSMutableDictionary alloc]init];
    [reqdesc setValue: @"" forKey:@"request_desc"];
    [listRequestArr addObject:reqdesc];

    // obj 04
    NSMutableDictionary *modesoft=[[NSMutableDictionary alloc]init];
    [modesoft setValue: @"" forKey:@"modes_str"];
    [listRequestArr addObject:modesoft];

    // obj 05
    NSMutableDictionary *origindes=[[NSMutableDictionary alloc]init];
    [origindes setValue: @"" forKey:@"origin_add"];
    [origindes setValue:nil forKey:@"origin_placemark"];
    [origindes setValue: @"" forKey:@"des_add"];
    [origindes setValue:nil forKey:@"des_placemark"];
    [listRequestArr addObject:origindes];

    // obj 06
    NSMutableDictionary *availability=[[NSMutableDictionary alloc]init];
    [availability setValue: @"" forKey:@"ret_or_one_way"];
    [availability setValue: @"" forKey:@"depdate1"];
    [availability setValue: @"" forKey:@"depdate2"];
    [availability setValue: @"" forKey:@"retdate1"];
    [availability setValue: @"" forKey:@"retdate2"];
    [listRequestArr addObject:availability];

    // obj 07
    NSMutableDictionary *passengers=[[NSMutableDictionary alloc]init];
    [passengers setValue: @"0" forKey:@"adult"];
    [passengers setValue: @"0" forKey:@"child"];
    [passengers setValue: @"0" forKey:@"infants"];
    [listRequestArr addObject:passengers];




    requestCompletion=[[NSMutableArray alloc]init];
    for (NSInteger i = 0; i < 10; i++)
        [requestCompletion addObject:[NSNumber numberWithInteger:0]];
}

-(void) reset;