iOS 11.0

Question

我制作了一个自定义的UITableViewRowAction。现在我想添加图片而不是文字。我知道这是可能的，但不知道该怎么做。你们中的某些人是否知道如何在Swift中做到这一点并想帮助我？谢谢你的回答！

Answer 1

iOS 11.0

夫特

Apple引入了灵活的方式来声明行动，并带来很多好处。

extension ViewController: UITableViewDelegate {
  func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
    let askAction = UIContextualAction(style: .normal, title: nil) { action, view, complete in
      print("Ask!")
      complete(true)
    }

    // here set your image and background color
    askAction.image = IMAGE
    askAction.backgroundColor = .darkGray

    let blockAction = UIContextualAction(style: .destructive, title: "Block") { action, view, complete in
      print("Block")
      complete(true)
    }

    return UISwipeActionsConfiguration(actions: [blockAction, askAction])
  }

  func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    cell.textLabel?.text = "row: \(indexPath.row)"
  }
}

示例：

iOS 8.0

您需要将UIImage设置为行动的backgroundColor，具体来说是：

夫特：

UIColor(patternImage: UIImage(named: "IMAGE_NAME"))

目标C：

[UIColor colorWithPatternImage:[UIImage imageNamed:@"IMAGE_NAME"]];

Answer 2

Swift 4（iOS 11 +）：

iOS 11现在（仅）支持在操作按钮中显示的图像。您只需要在表视图委托对象中初始化UISwipeActionsConfiguration对象：

extension MyTableViewController:UITableViewDelegate {

    func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {

        let deleteAction = UIContextualAction(style: .normal, title:  nil, handler: { (ac:UIContextualAction, view:UIView, success:(Bool) -> Void) in

                debugPrint("Delete tapped")

                success(true)
            })

        deleteAction.image = UIImage(named: "icon_delete.png")
        deleteAction.backgroundColor = UIColor.red

        return UISwipeActionsConfiguration(actions: [deleteAction])
    }

}

Answer 3

我制作了这个简单的UITableViewRowAction类别，以便为我的动作设置图标。您可以设置图像，背景颜色，单元格高度（以管理动态单元格）和图标大小（以百分比表示）。

extension UITableViewRowAction {

  func setIcon(iconImage: UIImage, backColor: UIColor, cellHeight: CGFloat, iconSizePercentage: CGFloat)
  {
    let iconHeight = cellHeight * iconSizePercentage
    let margin = (cellHeight - iconHeight) / 2 as CGFloat

    UIGraphicsBeginImageContextWithOptions(CGSize(width: cellHeight, height: cellHeight), false, 0)
    let context = UIGraphicsGetCurrentContext()

    backColor.setFill()
    context!.fill(CGRect(x:0, y:0, width:cellHeight, height:cellHeight))

    iconImage.draw(in: CGRect(x: margin, y: margin, width: iconHeight, height: iconHeight))

    let actionImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    self.backgroundColor = UIColor.init(patternImage: actionImage!)
  }
}

Answer 4

class TableViewRowAction: UITableViewRowAction 
{
    var image: UIImage?

    func _setButton(button: UIButton) 
    {
        if let image = image, let titleLabel = button.titleLabel
        {
            let labelString = NSString(string: titleLabel.text!)
            let titleSize = labelString.sizeWithAttributes([NSFontAttributeName: titleLabel.font])

            button.tintColor = UIColor.whiteColor()
            button.setImage(image.imageWithRenderingMode(.AlwaysTemplate), forState: .Normal)
            button.imageEdgeInsets.right = -titleSize.width
        }
    }
}


func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [UITableViewRowAction]? 
{
    let delete = TableViewRowAction(style: UITableViewRowActionStyle.Default, title: "         ") { action, indexPath in }
    delete.image = UIImage(named: "trashImg")

    let sharing = TableViewRowAction(style: UITableViewRowActionStyle.Default, title: "         ") { action, indexPath in }
    sharing.backgroundColor = UIColor.lightGrayColor()
    sharing.image = UIImage(named: "sharingImg")

    return [delete, sharing]
}

Answer 5

我只是实现更好的https://stackoverflow.com/a/48122210版本 1.在大多数情况下，单元格的高度和自定义滑动部分的宽度不同，您必须在函数中计算 2.图像可以具有与正方形不同的尺寸，因此您必须计算比例而不仅仅是高度。所以，代码包含我的修复

func setIcon(iconImage: UIImage, backColor: UIColor, cellHeight: CGFloat, customSwipPartWidth: CGFloat, iconSizePercentage: CGFloat) {
        let iconWidth = customSwipPartWidth * iconSizePercentage
        let iconHeight = iconImage.size.height / iconImage.size.width * iconWidth
        let marginY = (cellHeight - iconHeight) / 2 as CGFloat
        let marginX = (customSwipPartWidth - iconWidth) / 2 as CGFloat


        UIGraphicsBeginImageContextWithOptions(CGSize(width: customSwipPartWidth, height: cellHeight), false, 0)
        let context = UIGraphicsGetCurrentContext()

        backColor.setFill()
        context!.fill(CGRect(x:0, y:0, width:customSwipPartWidth, height:cellHeight))

        iconImage.draw(in: CGRect(x: marginX, y: marginY, width: iconWidth, height: iconHeight))

        let actionImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        self.backgroundColor = UIColor.init(patternImage: actionImage!)
    }

Answer 6

delActions.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"delete.png"]];

Answer 7

基本图案颜色方法的问题是您的图像需要与动作按钮的尺寸相同，或者至少在底部有一些更平坦的背景以防止图像重复（即使它会固定在顶部，这不是很好。）

我必须处理动态高度单元格，所以我实现了以下内容：

- (UIColor *)backgroundImageForActionAtIndexPath:(NSIndexPath *)indexPath withImage:(UIImage *)image tintColor:(UIColor *)tintColor backgroundColor:(UIColor *)backgrounfColor expectedWith:(CGFloat)width {
//
CGRect cellFrame = [self.tableView rectForRowAtIndexPath:indexPath];
CGSize expectedSize = CGSizeMake(width, cellFrame.size.height);

UIGraphicsBeginImageContextWithOptions(expectedSize, NO, 0.0);

CGContextRef ctx = UIGraphicsGetCurrentContext ();
if (ctx) {
    // set the background
    CGContextSetFillColorWithColor(ctx, backgrounfColor.CGColor);
    CGRect fillRect = CGRectZero;
    fillRect.size = expectedSize;
    CGContextFillRect(ctx, fillRect);
    // put the image
    CGContextSetFillColorWithColor(ctx, tintColor.CGColor);
    CGRect rect = CGRectMake((expectedSize.width - image.size.width) / 2., (expectedSize.height - image.size.height) / 2., image.size.width, image.size.height);
    [image drawInRect:rect];
}

UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

return [UIColor colorWithPatternImage:newImage];

}

您仍然必须设置expectedWidth，使其与您在动作标题中放置的空标签相匹配。例如：@“” - ＆gt; 64.f

正如您所看到的那样，您可以在代码中设置按钮的背景和色调，而不是在图稿本身中。

Answer 8

我的变体尝试使用UImageView的contentMode行为，当这还不够时，我发现了一些Core Geometry Rect方法有很好的用处，因为它们使目标框架在单元框架内居中。使用视力测验，似乎刷卡清除了我正常细胞宽度的一半，所以这就是魔术数字出现的地方。

Swift 3.0

extension UITableViewRowAction {

    func setIcon(iconImage: UIImage, backColor: UIColor, cellHeight: CGFloat, cellWidth:CGFloat) ///, iconSizePercentage: CGFloat)
    {
        let cellFrame = CGRect(origin: .zero, size: CGSize(width: cellWidth*0.5, height: cellHeight))
        let imageFrame = CGRect(x:0, y:0,width:iconImage.size.width, height: iconImage.size.height)
        let insetFrame = cellFrame.insetBy(dx: ((cellFrame.size.width - imageFrame.size.width) / 2), dy: ((cellFrame.size.height - imageFrame.size.height) / 2))
        let targetFrame = insetFrame.offsetBy(dx: -(insetFrame.width / 2.0), dy: 0.0)
        let imageView = UIImageView(frame: imageFrame)
        imageView.image = iconImage
        imageView.contentMode = .left
        guard let resizedImage = imageView.image else { return }
        UIGraphicsBeginImageContextWithOptions(CGSize(width: cellWidth, height: cellHeight), false, 0)
        guard let context = UIGraphicsGetCurrentContext() else { return }
        backColor.setFill()
        context.fill(CGRect(x:0, y:0, width:cellWidth, height:cellHeight))
        resizedImage.draw(in: CGRect(x:(targetFrame.origin.x / 2), y: targetFrame.origin.y, width:targetFrame.width, height:targetFrame.height))
        guard let actionImage = UIGraphicsGetImageFromCurrentImageContext() else { return }
        UIGraphicsEndImageContext()
        self.backgroundColor = UIColor.init(patternImage: actionImage)
    }
}

用法：通过tableview委托的editActions ...方法。

let cellHeight = (self.tableView(tableView, cellForRowAt: indexPath)).frame.size.height
let cellWidth = (self.tableView(tableView, cellForRowAt: indexPath)).frame.size.width
let favorite = UITableViewRowAction(style: .normal, title: nil) { action, index in
                //perform action
                debugPrint("Test")

            }
favorite.setIcon(iconImage: #imageLiteral(resourceName: "favorite"), backColor: .green, cellHeight: cellHeight, cellWidth:cellWidth)

Answer 9

对于那些想要创造这种效果的人；

我为 UISwipeActionsConfiguration 创建了一个扩展程序，您无需任何第三方库即可使用。基本上，这个想法是从图像和文本创建一个属性字符串，并将其设置为标签并从该标签创建一个图像。并将其附加到 UIContextualAction 的 image 属性。

extension UISwipeActionsConfiguration {

    public static func makeTitledImage(
        image: UIImage?,
        title: String,
        textColor: UIColor = .white,
        font: UIFont = .systemFont(ofSize: 14),
        size: CGSize = .init(width: 50, height: 50)
    ) -> UIImage? {
        
        /// Create attributed string attachment with image
        let attachment = NSTextAttachment()
        attachment.image = image
        let imageString = NSAttributedString(attachment: attachment)
        
        /// Create attributed string with title
        let text = NSAttributedString(
            string: "\n\(title)",
            attributes: [
                .foregroundColor: textColor,
                .font: font
            ]
        )
        
        /// Merge two attributed strings
        let mergedText = NSMutableAttributedString()
        mergedText.append(imageString)
        mergedText.append(text)
        
        /// Create label and append that merged attributed string
        let label = UILabel(frame: CGRect(x: 0, y: 0, width: size.width, height: size.height))
        label.textAlignment = .center
        label.numberOfLines = 2
        label.attributedText = mergedText
        
        /// Create image from that label
        let renderer = UIGraphicsImageRenderer(bounds: label.bounds)
        let image = renderer.image { rendererContext in
            label.layer.render(in: rendererContext.cgContext)
        }
        
        /// Convert it to UIImage and return
        if let cgImage = image.cgImage {
            return UIImage(cgImage: cgImage, scale: UIScreen.main.scale, orientation: .up)
        }
        
        return nil
    }
}

你可以这样使用它；

public func tableView(
        _ tableView: UITableView,
        trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath
    ) -> UISwipeActionsConfiguration? 
{
        let deleteAction = UIContextualAction(
            style: .normal,
            title:  nil,
            handler: { [weak self] (_, _, success: (Bool) -> Void) in
                success(true)
                print("Your action in here")
            }
        )
        
        deleteAction.image = UISwipeActionsConfiguration.makeTitledImage(
            image: UIImage(named: "delete_icon"),
            title: "Delete")
        )
        deleteAction.backgroundColor = .orange
        return UISwipeActionsConfiguration(actions: [deleteAction])
}

标题的UITableViewRowAction图像

9 个答案:

iOS 11.0

夫特

iOS 8.0

夫特：

目标C：