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我有一个UITabBarController链接到 2 UIViewControllers，并且在“第一个”UIViewController中，当我切换到另一个视图控制器并返回时，我需要维护其值的属性。相反，每次我切换视图控制器时，这些属性的值都会被重置。我该如何解决？谢谢！

编辑：

这是我的代码UIViewController（滚动视图位于除标签栏和顶部的导航栏之外的所有内容）：

SplitBillViewController.m

@interface SplitBillViewController ()

@property (nonatomic) NSMutableArray *defPricesArray;
@property (nonatomic) NSMutableArray *defQtyArray;
@property (nonatomic) NSMutableArray *defTickArray;
@property (nonatomic) NSMutableArray *defPeopleArray;
@end

@implementation SplitBillViewController


- (void)viewDidLoad{
    [super viewDidLoad];
}

-(NSMutableArray *)defPeopleArray{
    if(!_defPeopleArray){
        _defPeopleArray=[[NSMutableArray alloc] initWithObjects:@"1", nil];
    }
    return _defPeopleArray;
}
-(NSMutableArray *)defQtyArray{
    if(!_defQtyArray){
        _defQtyArray=[[NSMutableArray alloc] initWithObjects:@"1", nil];
    }
    return _defQtyArray;
}
-(NSMutableArray *)defPricesArray{
    if(!_defPricesArray){
        _defPricesArray=[[NSMutableArray alloc] initWithObjects:@"0.00", nil];
    }
    return _defPricesArray;
}
-(NSMutableArray *)defTickArray{
    if(!_defTickArray){
        _defTickArray = [[NSMutableArray alloc] initWithObjects:[NSNumber numberWithInt:1], nil];
    }
    return _defTickArray;
}




-(void)viewWillAppear:(BOOL)animated{
    n=1;
    aid=@"";
   UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
                                   initWithTarget:self
                                   action:@selector(dismissTipPercentage)];

    [self.view addGestureRecognizer:tap];
    if (iPhone5){
        self.view.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"background-568h"]];
    }
    else {
        self.view.backgroundColor = [UIColor blackColor];
    }
    [self.scrollView addSubview:self.itemTable];
    [self.scrollView addSubview:self.totalValue];
    [self.scrollView addSubview:self.tip];
    [self.scrollView addSubview:self.tipPercentage];
    [self.scrollView addSubview:self.addedValue];
    [self.scrollView addSubview:self.perPerson];
    self.scrollView.alpha=1;
    if (!iPhone5)[self.scrollView setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"ScrollViewBackground"]]];
    else [self.scrollView setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"ScrollViewBackground-568h"]]];
}
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