iphone - 如何像sqlite一样将整数值保存到NSuserDefault？

Question

我想在 NSUserDefault 中保存和检索值。我正在成功地保存和检索值(value)。但是当我去 cak Homepage 并再次进入我的类(class)时，值不会被存储，所有的过程都会再次完成。它不记住旧值。

我在做这个-

-(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);
}

我们非常欢迎任何想法或建议。

Answer 1

保存一个整数；

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

取回它；

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

祝你好运!