分段 UITableView 中的按钮标记问题

Posted 2023-02-27

【中文标题】分段 UITableView 中的按钮标记问题

【英文标题】：Issue with button tag in sectioned UITableView

【发布时间】：2011-10-28 12:13:38

【问题描述】：

我在分段的 tableview 单元格中有两个按钮，竖起大拇指和竖起大拇指。 最初没有选择两个按钮的图像。当我选择竖起大拇指按钮时，它的图像变为竖起大拇指选中，而另一个变为竖起大拇指未选中，反之亦然。

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
    
        enter code hereNSLog(@"mod:numberOfSectionsInTableView");
        NSLog(@"[preferences count]=%d",[preferences count]);
        return  [preferences count];
    

    -(NSInteger)tableView:(UITableView *)tableView
    numberOfRowsInSection:(NSInteger)section
    enter code here
        enter code herereturn [self.choices count];
    

    - (UITableViewCell *)tableView:(UITableView *)tableView
             cellForRowAtIndexPath:(NSIndexPath *)indexpath
    


    NSLog(@"cellForRowAtIndexPath: DISPLAY TEST");  
        static NSString *CellIdentifier = @"Cell";
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

        if (cell == nil) 

            cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
                        NSLog(@"Text is: %@", [choices objectAtIndex:indexpath.row]);                   
            NSLog(@"CHOICE AT INDEX PATH IS: %@",[choices objectAtIndex:indexpath.row %[choices count]]);
            cell.textColor = [UIColor whiteColor];
            cell.backgroundColor = [UIColor blackColor];


            // Thumbs up button.
            //UIButton *thumbsUp = [[UIButton alloc]init];  
            thumbsUp = [UIButton buttonWithType:UIButtonTypeCustom];                        
            [thumbsUp setTag:(indexpath.row+(indexpath.section * 50))];
            [thumbsUp addTarget:self 
                         action:@selector(thumbUp_ButtonClicked:event:)
             forControlEvents:UIControlEventTouchUpInside];     
            [thumbsUp setTitle:@"" forState:UIControlStateNormal];
            thumbsUp.frame = CGRectMake(150.0, 20, 20, 15);
            [thumbsUp setBackgroundImage:[UIImage imageNamed:@"thumbsup_not_selected.png"]
         forState:UIControlStateNormal];

            //NSLog(@"------------------>TAG TEST : %d",(indexpath.row+(indexpath.section * 50)));
            [cell.contentView addSubview:thumbsUp];

            // Thumbs down button

            thumbsDown = [UIButton buttonWithType:UIButtonTypeCustom];
            [thumbsDown addTarget:self 
                           action:@selector(thumbDown_ButtonClicked:event:)
                forControlEvents:UIControlEventTouchUpInside];
            [thumbsDown setTitle:@"" forState:UIControlStateNormal];
            thumbsDown.frame = CGRectMake(200, 20, 20, 15);

            [thumbsDown setTag:indexpath.row+120];
            [cell.contentView addSubview:thumbsDown];
            [cell setSelectionStyle:UITableViewCellSelectionStyleNone];


        [thumbsDown setBackgroundImage:[UIImage imageNamed:@"thumbsdown_not_selected.png"]forState:UIControlStateNormal];

        

        NSLog(@"------------> TAG TEST %d",thumbsUp.tag);
        cell.text = [choices objectAtIndex:(indexpath.row % [choices count])];


        NSLog(@"HELLO FOR TESTING");
        return cell;


        
    - (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section 
        NSString *sectionTitle = [self tableView:tableView titleForHeaderInSection:section];
        if (sectionTitle == nil) 
            return nil;
        

        // Create label with section title
        UILabel *label = [[[UILabel alloc] init] autorelease];
        label.frame = CGRectMake(15, 10, 300, 25);
        label.backgroundColor = [UIColor clearColor];
        label.textColor = [UIColor blackColor];
        label.shadowColor = [UIColor whiteColor];
        label.shadowOffset = CGSizeMake(0.0, 1.0);
        label.font = [UIFont boldSystemFontOfSize:16];
        label.textAlignment = UITextAlignmentLeft;
        label.text = sectionTitle;


        // Create header view and add label as a subview
        UIView *view = [[UIView alloc] initWithFrame:CGRectMake(12, 0, 300, 60)];
        [view autorelease];
        [view addSubview:label];
        //[view addSubview:segmentedControl];
        view.backgroundColor = [UIColor grayColor];
        return view;
    

    //Thumbs Up Button Action

    - (IBAction)thumbUp_ButtonClicked:(id)sender event:(id)event
    
        NSLog(@"Thumbs Up Check!");


        UIButton *button = (UIButton *)sender;
        UITableViewCell *cell = (UITableViewCell *) [[button superview] superview];


        NSIndexPath *indexPath = [myTable indexPathForCell:cell];
        NSLog(@"indexpath =%d",indexPath.row);
        //[button setTag:indexPath.row+(indexPath.section * 50)];

        int cTag=[sender tag];
        NSLog(@"------>TAG : %d", cTag);
        NSLog(@"------> Calculated TAG %d",indexPath.row+(indexPath.section * 50));
        if(cTag == (indexPath.row+(indexPath.section * 50)))
        
            NSLog(@"BUTTON COUNT:");
            [button setBackgroundImage:[UIImage imageNamed:@"thumbsup_selected.png"]
                           forState:UIControlStateNormal];
        


        NSInteger section = indexPath.section;
        NSInteger row = indexPath.row;

        //int row = button.tag;

        NSLog(@"SECTION IS:%d",section);
        NSLog(@"ROW IS: %d",row);


            NSArray *array = cell.contentView.subviews;
        NSLog(@"NUMBER OF OBJECTS: %d",[array count]);
        UIButton *test = (UIButton *)[array objectAtIndex:2];

        [test setBackgroundImage:[UIImage imageNamed:@"thumbsdown_not_selected.png"]forState:UIControlStateNormal];

    

由于在我更改一个按钮的图像时按钮标签出现问题，因此多个按钮正在更改。如果有人可以请找到解决方案，这将有所帮助....

【参考方案1】：

由于表格视图单元被回收，这是很常见的情况。您的带有按钮标签的方案相当复杂且容易出错。

在表格视图的数据源数据模型中跟踪每个单元格的 ThumbsUp/Down 状态会更有意义。然后，在cellForRowAtIndexPath: 中明确设置每个按钮的状态。

顺便说一句：cell.text 和 cell.textColor 已弃用。您应该使用cell.textLabel 的属性。

【讨论】：

如果有人可以请提供代码来纠正问题，这将有所帮助。问题在于为按钮设置标签...