replaceObjectAtIndex objectforKey崩溃

Question

我想用其他值替换我的数组的内容，

这是我的数组值：

    [Arr objectAtIndex:i] =  "End_Date" = "31 Mar 2014";
                             "Merchant_Category_Id" = 162;
                             "Merchant_ID" = 1262;
                             "Merchant_Name" = Mp;
                             "Merchant_SmallImage" = "http://abcdm/imge/cb256.jpg";
                             "Voucher_Id" = 130510;
                             "Voucher_Name" = "Rs 555 OFF";
                              favStatus = 0;

我想要做的是，我想在0

的1更新从i到[Arr replaceObjectAtIndex:[[[Arr objectAtIndex:i] objectForKey:@"favStatus"] integerValue] withObject:@"1"]; 的favStatus

这是我尝试过的代码片段，

0

每当我记录[[[Arr objectAtIndex:i] objectForKey:@"favStatus"] integerValue]

时它返回值{{1}}

请提前帮助和谢谢。

Answer 1

您正在使用字符串@“0”替换整个对象（字典）。

实际上你可以创建一个新的tempDictionary，并提取@“favStatus”的keyValue。替换它，然后将新对象放在数组中：

NSMutableDictionary *tempDictionary = [[Arr objectAtIndex:i] mutableCopy];
[tempDictionary setValue:@"0" forKey:@"favStatus"];

 [Arr replaceObjectAtIndex: i
                withObject: tempDictionary];

Answer 2

试试这段代码。

NSMutableDictionary *yourDictionary = [[Arr objectAtIndex:i] mutableCopy];
[yourDictionary removeObjectForKey:@"favStatus"];
[yourDictionary setValue:@"0" forKey:@"favStatus"];

[Arr replaceObjectAtIndex: i
               withObject: yourDictionary];

我希望这段代码对你有用。

Answer 3

NSMutableDictionary *tempDictionary = [[Arr objectAtIndex:0] mutableCopy];
[tempDictionary setValue:@"1" forKey:@"favStatus"];

[Arr replaceObjectAtIndex:0 withObject:tempDictionary];

Answer 4

这看起来很奇怪。数组的元素是NSMutableDictionaries吗？如果是，您可以使用favStatus更新i索引arr[i][@"favStatus"] = @1;。

Answer 5

你可以试试这个。我以它为例

使用数组并添加词典。

NSMutableArray *arr = [[NSMutableArray alloc] init];

for(int i=0;i<4;i++){

    NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
    [dict setObject:[NSString stringWithFormat:@"karun%d",i] forKey:@"Merchant_Name"];
    [dict setValue:[NSNumber numberWithInt:0] forKey:@"favStatus"];

    [arr addObject:dict];

}

NSLog(@"Before Replace : %@",arr.description);

现在我要将所有字典favStatus值替换为1

for(int i=0;i<arr.count;i++){

    NSMutableDictionary *dict = (NSMutableDictionary*)[arr objectAtIndex:i];
    [dict setValue:[NSNumber numberWithInt:1] forKey:@"favStatus"];

}

NSLog(@"After Replace : %@",arr.description);

希望这会有所帮助：）