我有自定义单元格UIButton和UIImage内容，目标操作选择器pushToImageDetailViewController：将视图推送到另一个图像细节视图。 我在他的委托方法中从UIPickerView创建单元格，然后我在服务器上下载图像，下一个存储到文档路径库。我需要在我的自定义单元格attachmentId上编辑属性，这就是问题所在。
- (void)pushToImageDetailViewController:(id)sender
{
[MessageLoader invalidate];
[self.messageInputFieldView resignFirstResponder];
while (sender && ![sender isKindOfClass:[MessageTableViewCell class]]) {
sender = [sender superview];
}
if (!sender) {
NSLog(@"Error by getting cell from superview of button");
} else {
MessageTableViewCell *cell = (MessageTableViewCell *) sender;
ImageDetailViewController *imageDetailView = [[ImageDetailViewController alloc] init];
imageDetailView.sender = cell.sender;
imageDetailView.attachmentId = cell.attachmentId;
[[self navigationController] pushViewController:imageDetailView animated:YES];
}
}
此代码我在块中，因此weakSelf对self属性，重要的是刷新单元格语句，indexPathForRow触发cellForRowAtIndexPath，在此消息中我有NSLog和右ID 进入这条消息。
NSMutableDictionary *messagesFromCollection = [weakSelf.messageDetailViewController.messages objectAtIndex:weakSelf.index];
[[[messagesFromCollection objectForKey:@"attachments"] firstObject] setObject:[fileId copy] forKey:@"id"];
// refresh concret cell
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:weakSelf.index inSection:0];
[weakSelf.messageDetailViewController.messagesTableView reloadRowsAtIndexPaths:@[indexPath]
withRowAnimation:UITableViewRowAnimationNone];
in cellForRowAtIndex将self.messages，Array of Dictionaries集合中的id分配给单元格属性attachmentId，但是在pushToImageDetail中我在预生成之前有旧ID。
cell.attachmentId = [attachmentInfo objectForKey:@"id"];
[cell.attachmentView addTarget:self action:@selector(pushToImageDetailViewController:) forControlEvents:UIControlEventTouchUpInside];
[cell.attachmentView setImage:attachmentImage forState:UIControlStateNormal];
[cell.bgImageView addSubview:cell.attachmentView];
[cell.contentView addSubview:cell.attachmentView];
问题是imageDetailView.attachmentId = cell.attachmentId中的id分配旧id（带有图像id的坏绑定图像细节），而在cellForRow中是新的实际cell.attachmentId = [attachmentInfo objectForKey：@“id”]。我不知道怎么可能。
这是cellForRow：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath {
NSDictionary *messagesFromDictionary = [self.messages objectAtIndex:indexPath.row];
NSString *message = [messagesFromDictionary objectForKey:@"message"];
UIImage *attachmentImage = [self.attachments objectAtIndex:indexPath.row];
NSString *time = [NSString formattedTime:[messagesFromDictionary objectForKey:@"posted_date"]];
NSString *beforeSender = [self beforeSender:indexPath];
static NSString *CellIdentifier;
if ([message isEqualToString:@""]) {
CellIdentifier = @"AttachmentCellIdentifier";
} else {
CellIdentifier = @"MessageCellIdentifier";
}
MessageTableViewCell *cell = (MessageTableViewCell *)
[self.messagesTableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil) {
cell = [[MessageTableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
cell.sender = [messagesFromDictionary objectForKey:@"user_id"];
cell.backgroundColor = [UIColor clearColor];
UIImage *bgImage = nil;
UIImage *arrowImage = nil;
CGRect messageFrame = {};
CGRect bgImageFrame = {};
CGRect profilePictureFrame = {};
CGRect timeFrame = {};
CGRect arrowFrame = {};
// Log message level 3
//[NSString LogMessages:[NSString stringWithFormat:@"S:%f, %f M: %@", messageFrame.size.width, messageFrame.size.height, message] :3];
/*
!!!! width and height for all cells !!!!
*/
cell.timeLabel.text = [NSString stringWithFormat:@"%@", time];
[cell.timeLabel sizeToFit];
timeFrame.size.height += cell.timeLabel.frame.size.height; // MUST BE DEFINED BEFORE Y COORDINATE
timeFrame.size.width += cell.timeLabel.frame.size.width;
profilePictureFrame.size.width += AVATAR;
profilePictureFrame.size.height += AVATAR;
if ([CellIdentifier isEqualToString:@"MessageCellIdentifier"]) {
cell.messageContentView.text = message;
CGSize textSizeFrame = { 320.0 - 5*PADDING - AVATAR - cell.timeLabel.frame.size.width - RESERVE - 12, CGFLOAT_MAX};
messageFrame.size = [message sizeForText:textSizeFrame withFontSize:MESSAGE_FONTSIZE];
messageFrame.size.width += RESERVE;
messageFrame.origin.x += PADDING;
messageFrame.origin.y += PADDING;
bgImageFrame.origin.y += PADDING;
bgImageFrame.size.width = messageFrame.size.width + 3*PADDING + cell.timeLabel.frame.size.width;
bgImageFrame.size.height += messageFrame.size.height + 2*PADDING;
arrowFrame.size.width += MESSAGE_ARROW_WIDTH;
arrowFrame.size.height += MESSAGE_ARROW_HEIGHT;
arrowFrame.origin.y += bgImageFrame.size.height/2;
profilePictureFrame.origin.y += PADDING;
// must be defined after bgImageFrame height, timeFrame height
timeFrame.origin.y += bgImageFrame.size.height/2 - cell.timeLabel.frame.size.height/2;
// must be defined after messageFrame width
timeFrame.origin.x += messageFrame.size.width + PADDING;
} else if ([CellIdentifier isEqualToString:@"AttachmentCellIdentifier"]) {
// prepare fields to download attachment from server
NSArray *attachmentsFromDict = [messagesFromDictionary objectForKey:@"attachments"];
NSDictionary *attachmentInfo = [attachmentsFromDict objectAtIndex:0];
NSLog(@"id from cell %@", [attachmentInfo objectForKey:@"id"]);
cell.attachmentId = [attachmentInfo objectForKey:@"id"];
bgImageFrame.size.height = attachmentImage.size.height;
bgImageFrame.size.width = attachmentImage.size.width;
timeFrame.origin.y += PADDING;
// must be defined after bgImageFrame width, timeFrame width
timeFrame.origin.x += bgImageFrame.size.width/2 - timeFrame.size.width/2;
[cell.attachmentView addTarget:self action:@selector(pushToImageDetailViewController:) forControlEvents:UIControlEventTouchUpInside];
[cell.attachmentView setImage:attachmentImage forState:UIControlStateNormal];
cell.attachmentView.tag = indexPath.row;
[cell.bgImageView addSubview:cell.attachmentView];
[cell.contentView addSubview:cell.attachmentView];
}
// X, Y positions
if ([cell.sender isEqualToString:[[user userInfo] objectForKey:@"id"]]) { // left aligned (Sender)
bgImageFrame.origin.x = 320 - bgImageFrame.size.width - PADDING;
bgImage = [UIImage imageNamed:@"msg_sender.png"];
arrowFrame.origin.x += 320 - PADDING - 2;
arrowImage = [UIImage imageNamed:@"sender_arrow.png"];
cell.messageContentView.backgroundColor = [UIColor whiteColor];
cell.timeLabel.backgroundColor = [UIColor whiteColor];
} else { // right aligned (Receiver)
bgImageFrame.origin.x += AVATAR + 2*PADDING;
bgImage = [UIImage imageNamed:@"msg_receiver.png"];
arrowFrame.origin.x += AVATAR + 2*PADDING - MESSAGE_ARROW_WIDTH + 2;
arrowImage = [UIImage imageNamed:@"receiver_arrow.png"];
profilePictureFrame.origin.x += PADDING;
cell.messageContentView.backgroundColor = [UIColor colorWithRed:255/255.0 green:242/255.0 blue:254/255.0 alpha:1];
cell.timeLabel.backgroundColor = [UIColor colorWithRed:255/255.0 green:242/255.0 blue:254/255.0 alpha:1];
}
if ([CellIdentifier isEqualToString:@"AttachmentCellIdentifier"]) {
cell.attachmentView.frame = CGRectMake(IMAGE_WIDTH_PADDING + bgImageFrame.origin.x,
IMAGE_TOP_PADDING + timeFrame.size.height,
bgImageFrame.size.width - 2*IMAGE_WIDTH_PADDING,
bgImageFrame.size.height - IMAGE_BOTTOM_PADING - timeFrame.size.height);
}
if (
(![cell.sender isEqualToString:beforeSender]) &&
(![cell.sender isEqualToString:[[user userInfo] objectForKey:@"id"]])
)
{
[cell.profilePicture setFrame:profilePictureFrame];
// ==== load user avatar
cell.profilePicture.layer.masksToBounds = YES;
float radius = AVATAR/2;
CAShapeLayer *circle = [CAShapeLayer layer];
circle.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(KAPPA, KAPPA, 2.0*radius, 2.0*radius)
cornerRadius:radius].CGPath;
[cell.profilePicture.layer setMask:circle];
cell.profilePicture.image = [user getMyContactAvatar:cell.sender :existingContacts];
[cell.contentView addSubview:cell.profilePicture];
} else {
cell.profilePicture.frame = CGRectZero;
cell.profilePicture.image = nil;
[cell.profilePicture removeFromSuperview];
}
cell.messageContentView.frame = messageFrame;
[cell.bgImageView setFrame:bgImageFrame];
cell.bgImageView.image = bgImage;
cell.timeLabel.frame = timeFrame;
cell.textLabel.numberOfLines = 0;
cell.arrowView.frame = arrowFrame;
cell.arrowView.image = arrowImage;
cell.accessoryType = UITableViewCellAccessoryNone;
cell.selectionStyle = UITableViewCellSelectionStyleNone;
return cell;
}
答案 0 :(得分：1)
通过在UIButton上指定标记属性indexPath.row解决，但仍然不明白为什么我以前的方法不起作用。
- (void)pushToImageDetailViewController:(id)sender
{
[MessageLoader invalidate];
[self.messageInputFieldView resignFirstResponder];
UIButton *imageButton = (UIButton *)sender;
MessageTableViewCell *cell = (MessageTableViewCell *) [self tableView:self.messagesTableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:imageButton.tag inSection:0]];
ImageDetailViewController *imageDetailView = [[ImageDetailViewController alloc] init];
imageDetailView.sender = cell.sender;
imageDetailView.attachmentId = cell.attachmentId;
[[self navigationController] pushViewController:imageDetailView animated:YES];
}