3

我想在 NSUserDefault 中保存和检索值。我正在成功地保存和检索价值。但是当我去 cak 主页并再次进入我的班级时，该值没有被存储并且所有过程都再次完成。它不记得旧值。

我正在这样做——

-(void)ViewDidLoad{
    A = 0;                // int A; defone in .h
    [self calling_Once];
}

-(void)calling_Once{
     NSLog(@"A is: %d",A);     // A is always zero when I leave this class and return Back to this class. This is my only problem. I want A=1; when I go back And return to this class but 
     NSInteger B = [[NSUserDefaults standardUserDefaults] integerForKey:@"save_Interger_Value_For_Formula_One"];  //is not able to remeber value. It gives A=0; B =0; When I come back to this class, I want It should return A=1; B=1; and remember old value like sqlite when I return to this class.

     if (A==0) {
         [self refreshButton];
         NSLog(@"Before Increment A is: %d",A);
         A++;

         NSLog(@"After Increment A is: %d",A);

         [[NSUserDefaults standardUserDefaults] setInteger:A forKey:@"save_Interger_Value_For_Formula_One"];
    }

    NSInteger B = [[NSUserDefaults standardUserDefaults] integerForKey:@"save_Interger_Value_For_Formula_One"];
    B = A;

    NSLog(@" B is: %d",B);
    B = A;
    NSLog(@" A is: %d",A);
}

任何想法或建议都将受到高度欢迎。

4

4 回答 4

4

To save an integer;

[[NSUserDefaults standardUserDefaults] setInteger:number forKey:@"unique_name"];
[[NSUserDefaults standardUserDefaults] synchronize];

To retrieve it;

NSInteger x = [[NSUserDefaults standardUserDefaults] integerForKey:@"unique_name"];

Good luck!

于 2013-07-15T07:24:42.773 回答
2

尝试像这样实施..肯定会有所帮助...

@implementation ClassA

- (void)viewDidLoad
    {
        [super viewDidLoad];
        // Do any additional setup after loading the view, typically from a nib.
        [[NSUserDefaults standardUserDefaults]setInteger:100 forKey:@"save_Interger_Value_For_Formula_One"];
        [[NSUserDefaults standardUserDefaults] synchronize];
    }

@end

@implementation ClassB

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
       int B = [[[NSUserDefaults standardUserDefaults]        integerForKey:@"save_Interger_Value_For_Formula_One"] integerValue];

     NSLog(@"Interger Value %d",b);
}
于 2013-07-15T06:13:19.053 回答
0

只是synchronize你NSUserDefaults插入值之后。 

[[NSUserDefaults standardUserDefaults] synchronize];

您可以按照这个答案How to delete a user default value in NSUserDefaults?

在您的代码中，您最初将 0 设置为 A，试试这个 

-(void)ViewDidLoad
{
        A = [[NSUserDefaults standardUserDefaults] integerForKey:@"save_Interger_Value_For_Formula_One"];   
      [self calling_Once];
}
于 2013-07-15T06:23:26.380 回答
0 
NSUserDefaults * def=[NSUserDefaults standardUserDefaults];
    [def setInteger:yourvalue forKey:@"YourKey"];
    [def synchronize];

试试这个代码......

于 2013-07-15T06:24:15.277 回答