Question

我尝试了不同的方法，但无法得到正确的解决方案。我有一个单例数组，我的HomeVC中保存了键值对数组。此数组将保存在NSUserDefaults中，并在另一个Class RewardsVC中检索。但是一旦应用程序被杀死并重新启动，单例数组中的所有数据都将被删除。对此有何帮助？这是代码：

if ([json objectForKey:JSON_KEY_REWARDS]) 
{
    if([[json objectForKey:JSON_KEY_REWARDS] objectForKey:JSON_KEY_REWARD_ARRAY]){
        NSMutableArray *newRewardArray=[[json objectForKey:JSON_KEY_REWARDS] objectForKey:JSON_KEY_REWARD_ARRAY];
        if([newRewardArray count] > 0){
            shouldUpdate = TRUE;
        }
        for (NSMutableDictionary *reward in newRewardArray)
        {
            NSMutableDictionary *mutableReward = reward ;
            [[Utility getSharedInstance].rewardsFuckingArray addObject:mutableReward];
        }
    }
    [[NSUserDefaults standardUserDefaults] setObject:[Utility getSharedInstance].rewardsFuckingArray forKey:@"yourKey"];
    [[NSUserDefaults standardUserDefaults] synchronize];
    }

Utility是我的Singleton类，我在Utility.h中做了@property (strong, nonatomic) NSMutableArray *rewardsFuckingArray; +(Utility*) getSharedInstance;。在Utility.m中：

+(Utility*) getSharedInstance
{
    static Utility* _shared = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _shared = [[self alloc] init];
    });
    return _shared;
}

- (id)init {
    if (self = [super init]) {
        self.rewardsFuckingArray = [[NSMutableArray alloc] init];
    }

    return self;
}

I RewardsVC.m，我这样做了：

rewardsArray = [[[NSUserDefaults standardUserDefaults] arrayForKey:@"yourKey"] mutableCopy];

Answer 1

当应用程序被杀死时，您需要从NSUserDefaults加载数据。您可以在构建单个Utility实例时执行此操作，方法是在Utility.m文件中实现-(id)init方法，如下所示：

- (id)init
{
    if (self = [super init])
    {
        NSArray* rewards = [[NSUserDefaults standardUserDefaults] objectForKey:@"yourKey"];

        if (rewards != nil)
        {
             self.rewardsFuckingArray = [NSMutableArray arrayWithArray:rewards];
        }
        else
        {
             self.rewardsFuckingArray = [[NSMutableArray alloc] init];
        }
    }

    return self;
}

单例数组未保存到NSUserDefaults

1 个答案: