在我的 iPhone 应用程序中，我有UITableView一个 UIImageView、按钮和标签。我正在根据来自服务器的值更新我的数据库并更新表格视图中的详细信息。如果我第二次运行该应用程序，在服务器上进行一些修改后，图像视图没有得到更新。按钮和标签正在更新。当我从数据库中检查图像的本地路径时，它会在文档文件夹中显示新图像，但表格单元格仍显示旧图像。要查看更新的图像，我应该重新安装该应用程序。我应该怎么做才能解决这个问题？
这是我所做的工作流程：
- 从数据库加载新值，并将所有值保存在数组中
- 删除表格视图
- 再次创建表视图
- 重新加载表格视图。
Edit //为表格视图创建自定义单元格以显示不同的对象
- (UIMenuItemCell *) getCellContentView:(NSString *)cellIdentifier {
CGRect CellFrame = CGRectMake(0, 0, 150, 60);
CGRect Label1Frame = CGRectMake(20, 23, 98, 30);
CGRect imgFrame = CGRectMake(20, 48, 110, 123);
CGRect btnFrame = CGRectMake(25, 136, 100, 30);
UILabel *lblTemp;
UIImageView *itemImg;
UIButton *itemBtn;
UIMenuItemCell *cell = [[UIMenuItemCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
cell.frame = CellFrame;
//Initialize Label with tag 1.
lblTemp = [[UILabel alloc] initWithFrame:Label1Frame];
lblTemp.tag = 1;
lblTemp.textColor=[UIColor colorWithRed:139.0f/255.0f green:69.0f/255.0f blue:19.0f/255.0f alpha:1.0f];
lblTemp.textAlignment = UITextAlignmentCenter;
lblTemp.backgroundColor = [UIColor clearColor];
lblTemp.font = [UIFont systemFontOfSize:13.0];
[cell.contentView addSubview:lblTemp];
[lblTemp release];
//Initialize ImageView
itemImg = [[UIImageView alloc]initWithFrame:imgFrame];
itemImg.tag = 2;
[cell.contentView addSubview:itemImg];
[itemImg release];
//Initialize Button
itemBtn = [[UIButton alloc]initWithFrame:btnFrame];
itemBtn.frame = btnFrame;
itemBtn.tag = 3;
itemBtn.titleLabel.textColor = [UIColor blueColor];
itemBtn.titleLabel.font = [UIFont systemFontOfSize:9.0];
[cell.contentView addSubview:itemBtn];
[itemBtn release];
return cell;
}
// 自定义表格视图单元格的外观。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *CellIdentifier = [NSString stringWithFormat:@"Cell%d", indexPath.row];
UIMenuItemCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil){
cell = [self getCellContentView:CellIdentifier];
cell.transform = CGAffineTransformMakeRotation(M_PI_2);
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.cellItemName = (UILabel *)[cell viewWithTag:1];
cell.cellitemImage = (UIImageView *)[cell viewWithTag:2];
cell.cellItemButton = (UIButton *)[cell viewWithTag:3];
DataBaseClass *itemObj = [appDelegate.itemArray objectAtIndex:indexPath.row];
NSString *imageLocalFilePath = nil;
if ([[tempitemStatusArray objectAtIndex:indexPath.row] isEqualToString:@"NotAvailable"]) {
cell.cellItemProgress.hidden = YES;
cell.cellItemButton.hidden = NO;
imageLocalFilePath = [NSString stringWithFormat:@"%@",[tempItemLocalNotAvailPath objectAtIndex:indexPath.row]];
NSString *date = [self changeDateFormat:itemObj.itemReleaseDate];
[cell.cellItemButton setTitle:date forState:UIControlStateNormal];
cell.cellItemButton.userInteractionEnabled = NO;
cell.userInteractionEnabled = NO;
[cell.cellItemButton removeTarget:nil action:NULL forControlEvents:UIControlEventAllEvents];
[cell.cellItemButton setBackgroundImage:[UIImage imageNamed:@"not_available_bttn_bck_img"] forState:UIControlStateNormal];
}else if ([[tempitemStatusArray objectAtIndex:indexPath.row] isEqualToString:@"Available"]){
cell.cellItemButton.userInteractionEnabled = YES;
cell.userInteractionEnabled = YES;
cell.cellItemProgress.hidden = YES;
[cell.cellItemButton setTitle:@"" forState:UIControlStateNormal];
[cell.cellItemButton setBackgroundImage:[UIImage imageNamed:@"available_bttn_img_normal"] forState:UIControlStateNormal];
[cell.cellItemButton setBackgroundImage:[UIImage imageNamed:@"available_bttn_img_pressed"] forState:UIControlStateHighlighted];
[cell.cellItemButton removeTarget:nil action:NULL forControlEvents:UIControlEventAllEvents];
[cell.cellItemButton addTarget:self action:@selector(confirmationAlert:) forControlEvents:UIControlEventTouchUpInside];
imageLocalFilePath = [NSString stringWithFormat:@"%@",[tempItemLocalAvailPath objectAtIndex:indexPath.row]];
}
if ([imageLocalFilePath isEqualToString:@""]) {
[cell.cellitemImage setImage:[UIImage imageNamed:@"item01.png"]];
}else {
[cell.cellitemImage setImageWithURL:[NSURL fileURLWithPath:imageLocalFilePath] placeholderImage:[UIImage imageNamed:@"item01.png"]];
}
cell.cellItemName.text = [NSString stringWithFormat:@"%@",[tempItemNameArray objectAtIndex:indexPath.row]];
}
return cell;
}
请帮忙。