Warning: file_get_contents(/data/phpspider/zhask/data//catemap/9/ios/101.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181
Ios ✔ 选中UITableViewCell中的选定行_Ios_Uitableview - Fatal编程技术网

Ios ✔ 选中UITableViewCell中的选定行

Ios ✔ 选中UITableViewCell中的选定行,ios,uitableview,Ios,Uitableview,我是一个iOS开发新手。选中UITableViewCell后,我想在其上添加复选标记。选中另一行时,应删除复选标记。如何执行此操作?要设置复选标记: UITableViewCell *cell = ...; cell.accessoryType = UITableViewCellAccessoryCheckmark; 要选择/取消选择单元格,请执行以下操作: [cell setSelected:TRUE animated:TRUE]; // select [cell setSelected:F

我是一个iOS开发新手。选中UITableViewCell后,我想在其上添加复选标记。选中另一行时,应删除复选标记。如何执行此操作?

要设置复选标记:

UITableViewCell *cell = ...;
cell.accessoryType = UITableViewCellAccessoryCheckmark;
要选择/取消选择单元格,请执行以下操作:

[cell setSelected:TRUE animated:TRUE]; // select
[cell setSelected:FALSE animated:TRUE]; // deselect
要取消选择上一个单元格,请使用NSIndexPath*lastSelected ivar跟踪最后一个选定的单元格:

- (void)tableView:(UITableView*)tableView didSelectRowAtIndexPath:(NSIndexPath*)indexPath
{
   if (self.lastSelected==indexPath) return; // nothing to do

   // deselect old
   UITableViewCell *old = [self.tableView cellForRowAtIndexPath:self.lastSelected];
   old.accessoryType = UITableViewCellAccessoryNone;
   [old setSelected:FALSE animated:TRUE];

   // select new
   UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
   cell.accessoryType = UITableViewCellAccessoryCheckmark;
   [cell setSelected:TRUE animated:TRUE];

   // keep track of the last selected cell
   self.lastSelected = indexPath;
}

在UITableViewDatasource方法中:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if(cell == nil )
    {
        cell =[[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
    }
    if ([indexPath compare:self.lastIndexPath] == NSOrderedSame) 
    {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
    } 
    else 
    {
        cell.accessoryType = UITableViewCellAccessoryNone;
    }
    return cell;
}

// UITableView Delegate Method
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    self.lastIndexPath = indexPath;

    [tableView reloadData];
}
lastIndexPath是一个propertystrong NSIndexPath*lastIndexPath

小字体

// deselect old
UITableViewCell *old = [self.tableView cellForRowAtIndexPath:self.lastSelected];
cell.accessoryType = UITableViewCellAccessoryNone;
[cell setSelected:FALSE animated:TRUE];
应该读

// deselect old
UITableViewCell *old = [self.tableView cellForRowAtIndexPath:self.lastSelected];
old.accessoryType = UITableViewCellAccessoryNone;
[old setSelected:FALSE animated:TRUE];
而且在

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.row == [previouslySelected intValue])
    {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
        selectedIndex = indexPath;
        [cell setSelected:YES animated:YES];
    }
    else
    {
        cell.accessoryType = UITableViewCellAccessoryNone;
        [cell setSelected:NO animated:YES];
    }
} 
其中previouslySelected是您的本地ivar,等等。这样,如果您使用选定的索引重新加载,当您快速浏览可能的选择时,它也会被取消选择。

不要使用[tableview reloadData];//这是一把锤子

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath   *)indexPath
{
    [tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryCheckmark;
}

-(void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath 
{
    [tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryNone;
}
// Table View Controller -- without Multiple Selection

// Step 1

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    if(tableView.cellForRow(at: indexPath)?.imageView?.image == UIImage(systemName:"checkmark.circle")) {
         tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"circle")
    } else {
         tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"checkmark.circle")
    }
}

//Step 2

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
    cell.textLabel?.text = employeeValues[indexPath.row]
    cell.imageView?.image = UIImage(systemName:"circle")

    return cell
}

//  Table View Controller -- with Multiple Selection

@IBOutlet var myTableView: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()
    self.myTableView.allowsMultipleSelection = true
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
    cell.textLabel?.text = employeeValues[indexPath.row]
    cell.imageView?.image = UIImage(systemName:"circle")

    return cell
}

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

//   let cell = tableView.cellForRow(at: indexPath)?.accessoryType = UITableViewCell.AccessoryType.checkmark

    tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"checkmark.circle")

}

override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {

    tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"circle")  
}

我发现重新加载数据会以一种丑陋的方式中断取消选择动画

此Swift实现干净地添加/删除复选标记并取消选择行:

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    if self.lastSelection != nil {
        self.myTableView.cellForRowAtIndexPath(self.lastSelection)?.accessoryType = .None
    }

    self.myTableView.cellForRowAtIndexPath(indexPath)?.accessoryType = .Checkmark

    self.lastSelection = indexPath

    self.myTableView.deselectRowAtIndexPath(indexPath, animated: true)
}
其中lastSelection声明为var lastSelection:nsindepath


cellForRowAtIndexPath中不需要额外的活动。在Obj-C中复制应该不难。

上面提到的代码只适用于单个选择。下面的代码肯定适用于多个选择

// Table View Controller -- without Multiple Selection

// Step 1

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    if(tableView.cellForRow(at: indexPath)?.imageView?.image == UIImage(systemName:"checkmark.circle")) {
         tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"circle")
    } else {
         tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"checkmark.circle")
    }
}

//Step 2

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
    cell.textLabel?.text = employeeValues[indexPath.row]
    cell.imageView?.image = UIImage(systemName:"circle")

    return cell
}

//  Table View Controller -- with Multiple Selection

@IBOutlet var myTableView: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()
    self.myTableView.allowsMultipleSelection = true
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
    cell.textLabel?.text = employeeValues[indexPath.row]
    cell.imageView?.image = UIImage(systemName:"circle")

    return cell
}

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

//   let cell = tableView.cellForRow(at: indexPath)?.accessoryType = UITableViewCell.AccessoryType.checkmark

    tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"checkmark.circle")

}

override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {

    tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"circle")  
}

假设您所在的类继承自UITableViewController,则在Swift 3中实现了以下功能:

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    // Add a visual cue to indicate that the cell was selected.
    self.tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}

override func tableView(_ tableView: UITableView, willSelectRowAt indexPath: IndexPath) -> IndexPath? {
    // Invoked so we can prepare for a change in selection.
    // Remove previous selection, if any.
    if let selectedIndex = self.tableView.indexPathForSelectedRow {
        // Note: Programmatically deslecting does NOT invoke tableView(:didSelectRowAt:), so no risk of infinite loop.
        self.tableView.deselectRow(at: selectedIndex, animated: false)
        // Remove the visual selection indication.
        self.tableView.cellForRow(at: selectedIndex)?.accessoryType = .none
    }
    return indexPath
}
当选择任何要显示复选标记的行时,只需调用didSelectRowAtIndexPath方法,然后选择checkmarkrow作为隐藏复选标记

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath: (NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:true];
    NSLog(@"touch");

    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    if (cell.accessoryType == UITableViewCellAccessoryNone)
    {
       cell.accessoryType = UITableViewCellAccessoryCheckmark;
    }
    else
    {
       cell.accessoryType = UITableViewCellAccessoryNone;
    }
}

再次选中带有复选标记的选定单元格时,只需删除所选内容即可

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath*)indexPath
{
    BOOL isSelected = ([tableView cellForRowAtIndexPath:indexPath].accessoryType ==  UITableViewCellAccessoryCheckmark);
    if(isSelected){
        [tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryNone;
        [tableView deselectRowAtIndexPath:indexPath animated:YES]; //this won't trigger the didDeselectRowAtIndexPath, but it's always a good idea to remove the selection
    }else{
        [tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryCheckmark;
    }
}

- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath*)indexPath
{
    [tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryNone;
}
奖金:


使用self.tableView.indexPathForSelectedRow检测选定单元格的indexPath

如果对大量数据重复使用单元格,则上述答案无效。在滚动条上可以看到重复的复选标记。要避免使用以下步骤:

在变量上声明: 变量索引编号:NSInteger=-1

在cellforRowAtIndexPath中添加以下代码:

 override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{         
       if indexNumber == indexPath.row{
           cell.accessoryType = .checkmark
       }else{
           cell.accessoryType = .none
       }
}
并在didselectAtIndexpath中添加以下代码:

重写func tableView\utableview:UITableView,didSelectRowAt indexPath:indexPath{

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
            tableView.cellForRow(at: indexPath as IndexPath)?.accessoryType = .checkmark    
indexNumber = indexPath.row
}
override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
       tableView.cellForRow(at: indexPath as IndexPath)?.accessoryType = .none
}

最好从另一个方向面对这个问题。将所有工作放在内部UIKit机制上,并将实现转移到UITableViewCell:

@implementation MYTableViewCell

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];

    self.accessoryType = selected ? UITableViewCellAccessoryCheckmark : UITableViewCellAccessoryNone;
}

- (void)prepareForReuse {
    [super prepareForReuse];
    self.accessoryType = UITableViewCellAccessoryNone;
}

@end
基于形成的dataArray表视图..类似地,我获取一个空数组,每当用户点击单元格时,基于from dataArray的indexValue,我将该对象存储在selectedDataArray中

至于这个问题,它就像…一个问题有多个选项答案,但最终只有一个或没有答案

同样,只有一个单元格应该显示复选标记,其余的单元格应该是未选中的…在某些情况下,你可以取消选择你的答案…我希望这是这个问题的最佳答案

更新Swift 4


swift 4,以备不时之需

var lastSelection: NSIndexPath!
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {


    //CHECK MARK THE CELL
    if self.lastSelection != nil {
        self.tableView.cellForRow(at: self.lastSelection as IndexPath)?.accessoryType = .none
    }

    self.tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark

    self.lastSelection = indexPath as NSIndexPath

    self.tableView.deselectRow(at: indexPath, animated: true)

}

使用Swift 4.2和Swift 5 TableView中仅选定行的复选标记工作代码

   func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
    self.tableView.cellForRow(at: indexPath)?.accessoryType = .none
}
   func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    //print(self.coloursArray[indexPath.row])

     self.tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}

我认为在自定义UITableViewCell实现中设置附件更干净。在swift中,我使用了:

override func setSelected(_ selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)

    // Configure the view for the selected state
    accessoryType = selected ? .checkmark : .none
}

有两种方法可以做到这一点。一种是没有多个 选择和另一个是多个选择

// Table View Controller -- without Multiple Selection

// Step 1

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    if(tableView.cellForRow(at: indexPath)?.imageView?.image == UIImage(systemName:"checkmark.circle")) {
         tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"circle")
    } else {
         tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"checkmark.circle")
    }
}

//Step 2

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
    cell.textLabel?.text = employeeValues[indexPath.row]
    cell.imageView?.image = UIImage(systemName:"circle")

    return cell
}

//  Table View Controller -- with Multiple Selection

@IBOutlet var myTableView: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()
    self.myTableView.allowsMultipleSelection = true
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
    cell.textLabel?.text = employeeValues[indexPath.row]
    cell.imageView?.image = UIImage(systemName:"circle")

    return cell
}

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

//   let cell = tableView.cellForRow(at: indexPath)?.accessoryType = UITableViewCell.AccessoryType.checkmark

    tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"checkmark.circle")

}

override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {

    tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"circle")  
}
斯威夫特5


如果我只需要选中标记,并希望在选择后取消选择该行,该怎么办?根据文档,在每个节@Ujwal-Manjunath voidreloadData中选择相同的索引行应该相对便宜。然而,这在语义上更令人满意。为什么不应该使用“[tableview reloadData]“?我想在我的tableview中使用multiselect。我正在使用从服务器接收的对象来设置tableview单元格中的复选标记。一旦这样做,我会将检查对象保存在全局数组中。但是,当我在“didSelectRowAtIndexPath”方法中使用该数组进行比较时,我会查看indexpath是否与我的全局数组中的该对象匹配l数组。我找不到它。我想是[tableView reloadData]。你怎么看?请给出建议。如果你将单元格重新用于大量数据,则上述答案无效。在滚动屏幕上,你可以看到重复的复选标记。检查我的解决方案,这第一行仍然没有格式化为代码。使用Interpunction!此答案被刑事低估。
// Table View Controller -- without Multiple Selection

// Step 1

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    if(tableView.cellForRow(at: indexPath)?.imageView?.image == UIImage(systemName:"checkmark.circle")) {
         tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"circle")
    } else {
         tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"checkmark.circle")
    }
}

//Step 2

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
    cell.textLabel?.text = employeeValues[indexPath.row]
    cell.imageView?.image = UIImage(systemName:"circle")

    return cell
}

//  Table View Controller -- with Multiple Selection

@IBOutlet var myTableView: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()
    self.myTableView.allowsMultipleSelection = true
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
    cell.textLabel?.text = employeeValues[indexPath.row]
    cell.imageView?.image = UIImage(systemName:"circle")

    return cell
}

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

//   let cell = tableView.cellForRow(at: indexPath)?.accessoryType = UITableViewCell.AccessoryType.checkmark

    tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"checkmark.circle")

}

override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {

    tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"circle")  
}
// Check or Uncheck a cell 
        if let cell = tableView.cellForRow(at: indexPath) {
            if cell.accessoryType == .checkmark {
                cell.accessoryType = .none
            } else {
                cell.accessoryType = .checkmark
            }
        }

    var selectedIndex: IndexPath!

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    if selectedIndex != nil {
        tableView.cellForRow(at: selectedIndex)?.accessoryType = .none
    }
    tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
    selectedIndex = indexPath
    tableView.deselectRow(at: indexPath, animated: true)
}