如何检测uitableViewCell上触摸的按钮并更改该按钮的BG图像
我正在实现一个应用程序，其中我在每个单元格上都有UIButton，此按钮将特定事件添加到用户的收藏夹，然后再次单击该图像，它会从用户的收藏夹中删除该事件。我想检测用户按下该按钮的哪个单元格，并希望根据该按钮更改背景图像。
这是我的代码（我尝试过的。）
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:nil];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
uncheckButton = [[UIButton alloc]init];
appDelegate.setValue = 0;
[uncheckButton setFrame:CGRectMake (3, 25, 30, 30)];
[uncheckButton setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];
[uncheckButton setSelected:NO];
[uncheckButton addTarget:self action:@selector(uncheckedButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
[cell addSubview:uncheckButton];
[cell setAccessoryType:UITableViewCellAccessoryDisclosureIndicator];
return cell;
}
-(IBAction)uncheckedButtonClicked:(id)sender
{
if(appDelegate.setValue ==0)
{
appDelegate.setValue =1;
[uncheckButton addTarget:self action:@selector(uncheckedButtonClicked:) forControlEvents: UIControlEventTouchUpInside];
[uncheckButton setFrame:CGRectMake(3, 25, 30, 30)];
[uncheckButton setImage:[UIImage imageNamed:@"checked_red.png"] forState:UIControlStateNormal];
Reachability *reachability = [Reachability reachabilityForInternetConnection] ;
NetworkStatus netWorkStatus = [reachability currentReachabilityStatus] ;
if (netWorkStatus == ReachableViaWWAN || netWorkStatus == ReachableViaWiFi)
{
[NSThread detachNewThreadSelector:@selector(threadStartAnimating:) toTarget:self withObject:nil];
NSLog(@"%@",appDelegate.user_id);
Communication *objCommunication = [[Communication alloc] init];
objCommunication.delegate = self;
[objCommunication setServiceFor:@"My_Agenda_add"];
NSURL *url = [NSURL URLWithString: [NSString stringWithFormat:@"%@/api/join_session",BASE_URL]];
NSString *body = [ NSString stringWithFormat:@"user_id=%@&session_id=%@",[appDelegate.user_id objectAtIndex:0],[[self.globalSessionArray valueForKey:@"_id"]valueForKey:@"$id"]];
[objCommunication makeAsynchronousRequestWithUrl:url withBodyString:body andWithMethod:@"POST"];objCommunication = nil;
}
else
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:app_name message:network_connectivity delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[alert show];
}
}
else if(appDelegate.setValue)
{
appDelegate.setValue = 0;
[uncheckButton addTarget:self action:@selector(uncheckedButtonClicked:) forControlEvents: UIControlEventTouchUpInside];
[uncheckButton setFrame:CGRectMake(3, 25, 30, 30)];
[uncheckButton setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];
Reachability *reachability = [Reachability reachabilityForInternetConnection] ;
NetworkStatus netWorkStatus = [reachability currentReachabilityStatus] ;
if (netWorkStatus == ReachableViaWWAN || netWorkStatus == ReachableViaWiFi)
{
[NSThread detachNewThreadSelector:@selector(threadStartAnimating:) toTarget:self withObject:nil];
NSLog(@"%@",appDelegate.user_id);
Communication *objCommunication = [[Communication alloc] init];
objCommunication.delegate = self;
[objCommunication setServiceFor:@"My_Agenda_remove"];
NSURL *url = [NSURL URLWithString: [NSString stringWithFormat:@"%@/api/unjoin_session",BASE_URL]];
NSString *body = [ NSString stringWithFormat:@"user_id=%@&session_id=%@",[appDelegate.user_id objectAtIndex:0],[[self.globalSessionArray valueForKey:@"_id"]valueForKey:@"$id"]];
[objCommunication makeAsynchronousRequestWithUrl:url withBodyString:body andWithMethod:@"POST"];objCommunication = nil;
}
else
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:app_name message:network_connectivity delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[alert show];
}
}
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0] ;
NSLog(@"%@",indexPath);
UITableViewCell* cell = [self.agendaTableView cellForRowAtIndexPath:indexPath];
[cell addSubview:uncheckButton];
[self.agendaTableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationNone];
}
3 个答案:
答案 0 :(得分：2)
最简洁的方法是创建一个处理uncheckButtonClicked操作的UITableViewCell子类。自我将继续成为目标，因此它始终由正确的细胞处理。
另一种选择是在视图控制器级别上拥有一个跟踪UIButton / UITableViewCell对的NSDictionary。您可以通过这种方式查询字典以获取相应的UITableViewCell。
另一种选择是查询UIButton的超级视图，它将是正确的UITableViewCell。
-(IBAction)uncheckedButtonClicked:(id)sender
{
UIButton *button = (UIButton *)sender;
UITableViewCell *cell = (UITableViewCell *)[button superview];
...
}
答案 1 :(得分：1)
此代码存在以下几个问题：
-
每次更新时，您都会向单元格添加一个新的按钮子视图，这会导致泄漏，因为您没有重复使用旧按钮。相反，您应该只在初始化代码中添加一次按钮，并为其提供一个标记，您可以在获取重用单元格时使用该标记来访问该按钮。
-
根据您的说明，您希望同时选中已检查和未选中的案例，但似乎只有一个案例。要解决此问题，您可以在
cellForRowAtIndexPath中使用if / else语句，根据模型状态将按钮的图像设置为正确的。
百分之一的答案有一个很好的建议，即使用某种模型来跟踪按钮来自哪个单元格。 NSMutableDictionary在这里运行良好。我建议不要抓住按钮的超视图来获取它来自的单元格。试图从视图中获取模型是不好的做法，可能导致问题。
示例代码：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:nil];
UIButton *checkButton;
static const NSInteger kCheckButtonTag = 1;
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
[cell setAccessoryType:UITableViewCellAccessoryDisclosureIndicator];
checkButton = [[UIButton alloc] init];
[checkButton setFrame:CGRectMake (3, 25, 30, 30)];
[checkButton addTarget:self action:@selector(checkedButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
checkButton.tag = kCheckButtonTag;
[cell.contentView addSubview:uncheckButton];
}
else
{
checkButton = (UIButton *)[cell.contentView viewWithTag:kCheckButtonTag];
}
if(model is unchecked) // replace with correct condition
[checkButton setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];
else
[checkButton setImage:CHECKED_IMAGE_GOES_HERE forState:UIControlStateNormal]; // replace with your checked image
// assuming buttonToModelDictionary is an initialized ivar NSMutableDictionary
buttonToModelDictionary[checkButton] = YOUR_MODEL_OBJECT_GOES_HERE;
return cell;
}
- (void) checkButtonClicked:(id)sender
{
(UIButton *)button = (UIButton *)sender;
YOUR_MODEL_OBJECT_GOES_HERE = buttonToModelDictionary[button];
// do whatever you need to update the model here, then call [self.tableView reloadData] OR [self.tableView reloadRowsAtIndexPaths...] if you can gather the row using the model object, which you should be able to do.
}
答案 2 :(得分：1)
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = @"MyFeedCell";
NotificationCellView *cell = (NotificationCellView *) [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
NSArray* topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"NotificationCellView" owner:self options:nil];
for (id currentObject in topLevelObjects) {
if ([currentObject isKindOfClass:[UITableViewCell class]]) {
cell = (NotificationCellView *)currentObject;
break;
}
}
}
zNotification *notifiItem=(zNotification *)[notificationData objectAtIndex:indexPath.row];
cell.Name.text = notifiItem.userName;
cell.clipImage.hidden= !notifiItem.hasFile;
[cell.clipImage addTarget:self action:@selector(viewFiles:) forControlEvents:
UIControlEventTouchUpInside];
cell.clipImage.tag=indexPath.row+100000;
cell.leftImg.hidden=YES;
cell.left.hidden=YES;
cell.centerImg.hidden=YES;
cell.center.hidden=YES;
//cell.right.hidden=YES;
//cell.rightImg.hidden=YES;
[cell.right addTarget:self action:@selector(wall_Followup:) forControlEvents:UIControlEventTouchUpInside];
cell.right.tag = 1100+indexPath.row;
if(notifiItem.Type==0)
{
[cell.right setTitle:@"Reply" forState:UIControlStateNormal];
}else
{
[cell.center setTitle:@"Followup" forState:UIControlStateNormal];
}
switch (notifiItem.Type) {
case 0:
cell.tag.text=@"New Followup";
[cell.userImage setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://graph.facebook.com/%@/picture",notifiItem.userImg]]
placeholderImage:[UIImage imageNamed:@"placeholder.png"]];
break;
case 1:
cell.tag.text=@"New Task";
[cell.userImage setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://graph.facebook.com/%@/picture",notifiItem.userImg]]
placeholderImage:[UIImage imageNamed:@"placeholder.png"]];
cell.centerImg.hidden=NO;
cell.center.hidden=NO;
[cell.center setTitle:@"Done" forState:UIControlStateNormal];
[cell.centerImg setImage:[UIImage imageNamed:@"Done.png"]];
[cell.center addTarget:self action:@selector(doneTask:) forControlEvents:UIControlEventTouchUpInside];
cell.center.tag=1200+indexPath.row;
break;
case 2:
cell.tag.text=@"New Member";
[cell.userImage setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://graph.facebook.com/%@/picture",notifiItem.userImg]]
placeholderImage:[UIImage imageNamed:@"placeholder.png"]];
break;
case 3:
cell.tag.text=@"Task Reminder";
[cell.userImage setImage:[UIImage imageNamed:@"attention.png"]];
cell.Name.text = @"Attention";
cell.centerImg.hidden=NO;
cell.center.hidden=NO;
[cell.center setTitle:@"Done" forState:UIControlStateNormal];
[cell.centerImg setImage:[UIImage imageNamed:@"Done.png"]];
[cell.center addTarget:self action:@selector(doneTask:) forControlEvents:UIControlEventTouchUpInside];
cell.center.tag=1200+indexPath.row;
break;
case 4:
cell.tag.text=@"New File";
[cell.userImage setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://graph.facebook.com/%@/picture",notifiItem.userImg]]
placeholderImage:[UIImage imageNamed:@"placeholder.png"]];
break;
case 5:
cell.tag.text=@"Task Completed";
[cell.userImage setImage:[UIImage imageNamed:@"attention.png"]];
cell.Name.text = @"Attention";
cell.centerImg.hidden=NO;
cell.center.hidden=NO;
[cell.center setTitle:@"Delete" forState:UIControlStateNormal];
[cell.centerImg setImage:[UIImage imageNamed:@"Delete.png"]];
[cell.center addTarget:self action:@selector(deleteTask:) forControlEvents:UIControlEventTouchUpInside];
/*cell.leftImg.hidden=NO;
cell.left.hidden=NO;
[cell.left setTitle:@"Reassign" forState:UIControlStateNormal];
[cell.leftImg setImage:[UIImage imageNamed:@"re_Asign2.png"]];
[cell.left addTarget:self action:@selector(reAssign:) forControlEvents:UIControlEventTouchUpInside];*/
break;
case 6:
cell.tag.text=@"Task Deleted";
[cell.userImage setImage:[UIImage imageNamed:@"attention.png"]];
cell.Name.text = @"Attention";
break;
case 7:
cell.tag.text=@"Group Deleted";
[cell.userImage setImage:[UIImage imageNamed:@"attention.png"]];
cell.Name.text = @"Attention";
break;
case 8:
cell.tag.text=@"Group Invitation";
[cell.userImage setImage:[UIImage imageNamed:@"groupInv.png"]];
cell.Name.text = @"Invitation";
cell.centerImg.hidden=NO;
cell.center.hidden=NO;
[cell.center setTitle:@"Join" forState:UIControlStateNormal];
cell.center.tag = 1000+indexPath.row;
[cell.centerImg setImage:[UIImage imageNamed:@"join.png"]];
[cell.center addTarget:self action:@selector(joinGroup:) forControlEvents:UIControlEventTouchUpInside];
break;
default:
break;
}
cell.Details.text=notifiItem.MSG;
cell.date.text=notifiItem.date;//[NSString stringWithFormat:@"%d",notifiItem.Type];//notifiItem.date;
cell.groupName.text = notifiItem.group.title;
cell.accessoryType = UITableViewCellAccessoryNone;
if (!notifiItem.isChecked) {
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
float whiteFloat[4] = {1.0, 0.7, 0.7, 1.0};
CGColorRef white = CGColorCreate(colorSpace, whiteFloat);
cell.detailBox.layer.shadowColor=[[UIColor redColor] CGColor];
cell.shade.layer.backgroundColor=white;
}else
{
//CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
//float whiteFloat[4] = {0.7, 0.7, 0.7, 1.0};
//CGColorRef white = CGColorCreate(colorSpace, whiteFloat);
cell.detailBox.layer.shadowColor=[[UIColor blackColor] CGColor];
}
cell.selectionStyle = UITableViewCellSelectionStyleNone;
return cell;
}
- (IBAction)doneTask:(id)sender
{
UIButton *b=(UIButton *)sender;
NSLog(@"%d",b.tag);
[b setImage:[UIImage imageNamed:@"Delete.png"] forState:UIControlStateNormal];
zNotification *n=notificationData[b.tag-1200];
}
喂 这是我的一个项目的快速示例 这里是重要的案例3：代码是复杂的 但你可以使用按钮标签来指定单元格1200的行号我添加了b / c 在同一个单元格中有多个按钮，因此按钮A 1200和按钮B 1300以及我打电话时 函数我相应地删除1200或1300和doneTask函数简单地将按钮转换为UIButton并从标签获取行号并分配背景图像
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