UISlider已损坏

Question

我已经在每个UITableViewCell中以编程方式嵌入了一个UISlider，但是我注意到这些UISliders中的前两个总是被破坏，如下图所示。

当我第一次滑动时，UISlider按钮的一部分会被遗忘。还有其他人遇到过同样的问题吗？如果您需要查看我的代码，请告诉我。

除了这个问题，连接到它旁边的UISlider的UIlabel运行良好。

更多细节： 我的cellForRowAtIndexPath函数如下。请查看我添加UISlider的部分的最后一段。我也怀疑我可能会在单元格中添加1个以上的滑块。我通过检查行的NSLog输出检查了每个滑块只添加一次：

NSLog(@"initiating slider at section %d row %d", indexPath.section, indexPath.row);

部分和行的每个组合都是独一无二的！

我也觉得奇怪的是，只有前2行中的UISliders受此影响，无论我在表中有多少个tableViewCell行。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//creating a basic valid cell object
static NSString *cellIdentifier = @"ActivitiesTVCcell";
UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:cellIdentifier];

if (!cell){
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}

if(indexPath.section == 0){
    NSArray *rowNames = [self.phpReply_ActivitiesTVC componentsSeparatedByString:@"\n"];
    cell.textLabel.text = [rowNames objectAtIndex:indexPath.row+2];
}
else if (indexPath.section == 1){
    if (indexPath.row == 0) {
        cell.textLabel.text = @"Seated";
    }
    else if (indexPath.row == 1){
        cell.textLabel.text = @"Standing";
    }
}

cell.selectionStyle = UITableViewCellSelectionStyleNone;



//start code addition of graph button stuff
UIButton *graphButton = [UIButton buttonWithType:UIButtonTypeCustom];
[graphButton setFrame:CGRectMake(224, 0, 43, 37)];
[graphButton setBackgroundImage:[[UIImage imageNamed:@"graph icon.png"] stretchableImageWithLeftCapWidth:1.0 topCapHeight:1.0] forState:UIControlStateNormal];
[graphButton setBackgroundImage:[[UIImage imageNamed:@"graph icon.png"] stretchableImageWithLeftCapWidth:1.0 topCapHeight:1.0] forState:UIControlStateSelected];

[graphButton addTarget:self
                action:@selector(graphButtonPressed:)
      forControlEvents:UIControlEventTouchUpInside];
[cell addSubview:graphButton];
//end code addition of graph button stuff


//start code addition of video button stuff
UIButton *videoButton = [UIButton buttonWithType:UIButtonTypeCustom];
[videoButton setFrame:CGRectMake(300, 0, 43, 37)];
[videoButton setBackgroundImage:[[UIImage imageNamed:@"videoicon.png"] stretchableImageWithLeftCapWidth:1.0 topCapHeight:1.0] forState:UIControlStateNormal];
[videoButton setBackgroundImage:[[UIImage imageNamed:@"videoicon.png"] stretchableImageWithLeftCapWidth:1.0 topCapHeight:1.0] forState:UIControlStateSelected];

[videoButton addTarget:self action:@selector(videoButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
[cell addSubview:videoButton];
//end code addition of video button stuff


//start code for addition of enable switch
UISwitch *activityEnableSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(376, 7, 0, 0)]; //size components of CGRect are ignored
[activityEnableSwitch setOn:NO animated:YES];
[activityEnableSwitch addTarget:self
                         action:@selector(enableSwitchStateChanged:)
               forControlEvents:UIControlEventValueChanged];
[cell addSubview:activityEnableSwitch];
//end code for addition of enable switch

//start code for addition of target angle text field
UITextField *targetAngleTextField = [[UITextField alloc] initWithFrame:CGRectMake(476, 7, 50, 25)];
targetAngleTextField.borderStyle = UITextBorderStyleRoundedRect;
targetAngleTextField.font = [UIFont systemFontOfSize:15];
targetAngleTextField.textColor = [UIColor blackColor];
targetAngleTextField.placeholder = @"30";
targetAngleTextField.autocorrectionType = UITextAutocorrectionTypeNo;
targetAngleTextField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
targetAngleTextField.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
targetAngleTextField.keyboardType = UIKeyboardTypeNumberPad; //no num pad on ipad :(
//[targetAngleTextField becomeFirstResponder];
targetAngleTextField.delegate = self;

[cell addSubview:targetAngleTextField];
//end code for addition of target angle text field

//start code for addition of degree text label
UILabel *degreeLabel = [[UILabel alloc] initWithFrame:CGRectMake(532, 6, 10, 10)];
degreeLabel.text = @"o";
degreeLabel.font = [UIFont systemFontOfSize:10];
[cell addSubview:degreeLabel];
//end code for addition of degree text label

//start code for addition of progression level UISlider
NSLog(@"initiating slider at section %d row %d", indexPath.section, indexPath.row);
UISlider *progressionLevelSlider = [[UISlider alloc] initWithFrame:CGRectMake(576, 7, 150, 25)];
progressionLevelSlider.minimumValue = 0;
progressionLevelSlider.maximumValue = 9;
progressionLevelSlider.continuous = YES;
progressionLevelSlider.value = 3;

[progressionLevelSlider addTarget:self
           action:@selector(progressionSliderValueChanged:)
 forControlEvents:UIControlEventValueChanged];

[cell addSubview:progressionLevelSlider];
//end code for addition of progression level UISlider

//start code for addition of level ? text label
UILabel *progressionLevelLabel = [[UILabel alloc] initWithFrame:CGRectMake(782, 13, 10, 20)];
progressionLevelLabel.text = [NSString stringWithFormat:@"%d", 2];
progressionLevelLabel.font = [UIFont systemFontOfSize:17];
progressionLevelLabel.tag = 121; //tag represents this particular UIlabel, so that we can set it from outside this function.
[cell addSubview:progressionLevelLabel];
//end code for addition of level ? text label


[cell setTag:(indexPath.section)*100+indexPath.row];

return cell;
}

这是我的sliderValueChanged函数。我将此代码放在此处，因为只有在拖动滑块（更改其值）后才能看到“损坏”。

-(void)progressionSliderValueChanged: (UISlider *)sender {
int section = ([sender superview].tag)/100;
int row = [sender superview].tag%100;

int value = sender.value;

NSLog(@"slider value at section %d row %d was slided to %d",section, row, value);

UITableViewCell *superViewOfSlider = (UITableViewCell *)[sender superview];
UILabel *progressionLevelLabel = (UILabel *)[superViewOfSlider viewWithTag:121];
progressionLevelLabel.text = [NSString stringWithFormat:@"%d", value];
[superViewOfSlider addSubview:progressionLevelLabel];

}

Answer 1

每次重复使用单元格时，您都会向单元格添加一组全新的子视图。故障创建创建这些子视图的所有代码并将其移动到创建单元格的块中。 在该块之后，您只需找到所需的子视图（例如，使用标记）并设置这些子视图的值。