Question

我有array nsdictionaries，每个字典都有boolean值，我想在用户选择行时更改boolean值。

但不知怎的，我得到exc_bad_access。

这是字典的安装数组：

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];

当我尝试更改布尔值时，这会导致错误，XCODE显示行*params字典为错误：

- (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"]];


    }
}

上面代码中可能出现什么问题？谢谢，

空间

Answer 1

Objective-C集合类只能保存对象，而不能保存基本类型，因此请更改：

BOOL isFileChoosen=YES;

要：

NSNumber *isFileChosen = [NSNumber numberWithBool:YES];

为了在对象中有效地包装你的布尔值。

（当然，这会对代码的其他部分产生影响）。

更改nsdictionary中的bool值时的EXC_BAD_ACCESS

1 个答案: