NSMutableArray到NSUserDefaults，然后检索它iPhone

Question

下面的代码可以每天使用五次。每当有新的值被创建时，它将被保存在NSMutableArray中，并且以前的值不应该从那里删除。

可能吗？

if ([day isEqualToString:@"f"]) { 

     if ([name isEqualToString:@"f"]) { 
      NSString *faj = [[NSString alloc] initWithString:@"f1"]; 
      [friArray addObject:faj]; 
     } 
     else if ([name isEqualToString:@"z"]) { 
      NSString *faj = [[NSString alloc] initWithString:@"f2"]; 
      [friArray addObject:faj]; 
     } 
     else if ([name isEqualToString:@"a"]) { 
      NSString *faj = [[NSString alloc] initWithString:@"f3"]; 
      [friArray addObject:faj]; 
     } 
     else if ([name isEqualToString:@"m"]) { 
      NSString *faj = [[NSString alloc] initWithString:@"f4"]; 
      [friArray addObject:faj]; 
     } 
     else if ([name isEqualToString:@"i"]) { 
      NSString *faj = [[NSString alloc] initWithString:@"f5"]; 
      [friArray addObject:faj]; 
     } 

    } 

如在此代码，如果NSString F1保存在我的friArray，下一次的值可能是f2, f3, f4 or f5。现在我将从NSUserdefaults中检索数组。它应该保存所有的值。

我该如何做到这一点？

EDITED: 

我试过了，但它给了我friarray::(null)。可能是什么问题？

NSUserDefaults *day1 = [NSUserDefaults standardUserDefaults]; 
    friArray = [[day1 objectForKey:@"frArr"] mutableCopy]; 

    name = @"f"; 

    if ([day isEqualToString:@"f"]) { 

     if ([name isEqualToString:@"f"]) { 
      NSString *faj = [[NSString alloc] initWithString:@"f1"]; 
      [friArray addObject:faj]; 
     } 
     else if ([name isEqualToString:@"z"]) { 
      NSString *faj = [[NSString alloc] initWithString:@"f2"]; 
      [friArray addObject:faj]; 
     } 
     else if ([name isEqualToString:@"a"]) { 
      NSString *faj = [[NSString alloc] initWithString:@"f3"]; 
      [friArray addObject:faj]; 
     } 
     else if ([name isEqualToString:@"m"]) { 
      NSString *faj = [[NSString alloc] initWithString:@"f4"]; 
      [friArray addObject:faj]; 
     } 
     else if ([name isEqualToString:@"i"]) { 
      NSString *faj = [[NSString alloc] initWithString:@"f5"]; 
      [friArray addObject:faj]; 
     } 

     [day1 setObject:friArray forKey:@"frArr"]; 

     NSLog(@"friarray::%@", friArray); 

    } 

Answer 1

1. 负载friArray作为的NSMutableArray从NSUser默认的的if-else阶梯
2. 保存friArray前NSUserDefaults的在你的if-else 阶梯
3. 不要创建阵列的每一个条件结束声明

4. 第一次创建一次（第一次存储在NSUserDefaults中）。

   if([day1 objectForKey:@"frArr"] == nil) {

   // create array here.Happens first time. 
       friArray = [[NSMutableArray alloc]init]; 
   } 
   

Answer 2

嗨试试这个....

friArray =//Load as NSMutableArray from NSUserDefaults Dictionary for some key 

    if(!friArray)friArray =[[NSMutableArray alloc]init]; 

    if ([day isEqualToString:@"f"]) { 

      if ([name isEqualToString:@"f"]) { 

       NSString *faj = [[NSString alloc] initWithString:@"f1"]; 
       [friArray addObject:faj]; 
      } 
      else if ([name isEqualToString:@"z"]) { 

       NSString *faj = [[NSString alloc] initWithString:@"f2"]; 
       [friArray addObject:faj]; 
      } 
      else if ([name isEqualToString:@"a"]) { 

       NSString *faj = [[NSString alloc] initWithString:@"f3"]; 
       [friArray addObject:faj]; 
      } 
      else if ([name isEqualToString:@"m"]) { 

       NSString *faj = [[NSString alloc] initWithString:@"f4"]; 
       [friArray addObject:faj]; 
      } 
      else if ([name isEqualToString:@"i"]) { 

       NSString *faj = [[NSString alloc] initWithString:@"f5"]; 
       [friArray addObject:faj]; 
      } 

     } 
    //set friArray as NSMutableArray in NSUserDefaults Dictionary for some key 

Answer 3

-(void)addData{ 
    NSMutableDictionary *fridict 
    = [[NSMutableDictionary alloc]init]; 

    if ([day isEqualToString:@"f"]) { 

            if ([name isEqualToString:@"f"]) { 
                NSString *faj = [[NSString alloc] initWithString:@"f1"]; 
    [fridict setObject: faj forKey:@"f1"]; 
                       } 
            else if ([name isEqualToString:@"z"]) { 
                NSString *faj = [[NSString alloc] initWithString:@"f2"]; 
                [fridict setObject: faj forKey:@"f2"]; 
            } 
            else if ([name isEqualToString:@"a"]) { 
                NSString *faj = [[NSString alloc] initWithString:@"f3"]; 
                [fridict setObject: faj forKey:@"f3"]; 
            } 
            else if ([name isEqualToString:@"m"]) { 
                NSString *faj = [[NSString alloc] initWithString:@"f4"]; 
                [fridict setObject: faj forKey:@"f4"]; 
            } 
            else if ([name isEqualToString:@"i"]) { 
                NSString *faj = [[NSString alloc] initWithString:@"f5"]; 
                [fridict setObject: faj forKey:@"f5"]; 
            } 

    NSData *data = [NSKeyedArchiver archivedDataWithRootObject: fridict]; 
     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
     [defaults setObject:data forKey:@"fridict"]; 
} 

-(void)retriveData{ 
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
    NSData *data = [defaults objectForKey:@"fridict"]; 
     NSMutableDictionary *fridict = [NSKeyedUnarchiver unarchiveObjectWithData:data]; 
     NSString *faj = [fridict objectForKey:@"f1"]; 

}