ios - 更改 nsdictionary 中的 bool 值时出现 EXC_BAD_ACCESS

Question

我有一个nsdictionaries的array，每个字典都有一个boolean值，我想改变boolean用户选择行时的值。

但不知何故我得到了exc_bad_access。

这是设置字典数组的方式:

self.choosedfiles=[[NSMutableArray alloc] init];
for (NSString *s in fileListINDoc){
        NSArray *partialDates =[s componentsSeparatedByString:@"."];//split string where - chars are found
        NSFileManager* fm = [NSFileManager defaultManager];
        NSDictionary* attrs = [fm attributesOfItemAtPath:[dataPath stringByAppendingPathComponent:s] error:nil];
        NSDate *dateLocal =(NSDate*)[attrs objectForKey: NSFileModificationDate];

        //creatre unique name for image _AKIAIVLFQKMSRN5JLZJA
        NSString *uniqueFileName=[NSString stringWithFormat:@"%@_AKIAIVLFQKMSRN5JLZJA_%@.jpeg",[partialDates objectAtIndex: 0],[partialDates objectAtIndex: 1]];

        BOOL isFileChoosen=NO;

        NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
                                dateLocal,@"date",uniqueFileName,@"imagename",s,@"name",isFileChoosen,@"isFileChoosen",
                                nil];
        [tempArray addObject:params];
    }
    NSSortDescriptor *descriptor=[[NSSortDescriptor alloc] initWithKey:@"date" ascending:NO];
    NSArray *descriptors=[NSArray arrayWithObject: descriptor];
    NSArray *reverseOrder=[tempArray sortedArrayUsingDescriptors:descriptors];

    self.files=[[NSMutableArray alloc] initWithArray:reverseOrder];

当我尝试更改 boolean 值时，这会导致错误，XCODE 将行 *params 字典显示为错误:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   NSDictionary *currentArticle = [self.files objectAtIndex:indexPath.row];
   NSNumber* ischoosenObject =[currentArticle objectForKey:@"isFileChoosen"];
    if ([ischoosenObject boolValue]==NO) {
        BOOL isFileChoosen=YES;
        NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:[currentArticle objectForKey:@"date"],@"date",[currentArticle objectForKey:@"imagename"],@"imagename",[currentArticle objectForKey:@"name"],@"name",isFileChoosen,@"isFileChoosen",nil];
        [self.files replaceObjectAtIndex:indexPath.row withObject:params];
        [self.choosedfiles addObject:[currentArticle objectForKey:@"name"]];


    }
}

上面的代码可能有什么问题？谢谢，

空间

Answer 1

Objective-C 集合类只能保存对象，不能保存原始类型，所以改变:

BOOL isFileChoosen=YES;

收件人:

NSNumber *isFileChosen = [NSNumber numberWithBool:YES];

为了有效地包装您的 boolean 值到一个对象中。

(当然，这会对代码的其他部分产生一些影响)。