Question

我初始化了这个NSMutableDictionary：

define TAREFA      @"TAREFA"  
define DATA_ITEM        @"DATA"   
define HORA_ITEM        @"HORAS"  
define ID          @"ID"  
define STATE       @"NA"  
define APROVED     @"APROVED"  
define REJECTED    @"REJECTED" 

    itensArray = [[NSMutableArray alloc] init];

    for (int i=0; i< [listagens size]; i++)
    {   
        NSMutableDictionary *tmpDictionary = [[NSMutableDictionary alloc] initWithObjectsAndKeys:
                                        [[listagens item:i] WI_ID], ID,
                                        [[listagens item:i] WI_TEXT], TAREFA,
                                        [[listagens item:i] WI_CD], DATA_ITEM,                                            
                                        [[listagens item:i] WI_CT], HORA_ITEM,                                                                                     
                                        STATE, STATE,
                                        nil];

        [itensArray addObject:tmpDictionary];           
    }

稍后，我会执行以下操作：

    for (int i=0; i<[itensArray count]; i++) 
    {
        if ([[[itensArray objectAtIndex:i] objectForKey:ID] isEqualToString:cell.idLabel.text]) {
            [[itensArray objectAtIndex:i] setString:APROVED forKey:STATE];
            break;
        }
    }

我初始化数组，然后稍后，我更改了NSMutableDictionary的字符串。当我设置值时，我得到以下运行时错误：

'NSInvalidArgumentException'，原因：' - [__ NSCFDictionary setString：forKey：]：无法识别的选择器发送到实例0x7b7d170'

看来我没有正确改变价值。这是语法错误吗？怎么做？

Answer 1

也许你拼错了方法的名称。

// WRONG
[[itensArray objectAtIndex:i] setString:APROVED forKey:STATE];

// GOOD
[[itensArray objectAtIndex:i] setValue:APROVED forKey:STATE];

Answer 2

'NSInvalidArgumentException'，原因：' - [__ NSCFDictionary setString：forKey：]：无法识别的选择器发送到实例0x7b7d170'

NSMutableDictionary没有setString：forKey：方法。

尝试setObject：forKey：

[[itensArray objectAtIndex:i] setObject:APROVED forKey:STATE];

设置NSMutableDictionary的值时出错

2 个答案: