您可以使用UITableViewRowAction 的backgroundColor 设置自定义图像或视图。诀窍是使用UIColor(patternImage:)。
基本上UITableViewRowAction区域的宽度由其标题决定，因此您可以找到标题（或空白）的确切长度并使用patternImage设置图像的确切大小。
为了实现这个，我做了一个UIView的扩展方法。
func image() -> UIImage {
UIGraphicsBeginImageContextWithOptions(bounds.size, isOpaque, 0)
guard let context = UIGraphicsGetCurrentContext() else {
return UIImage()
}
layer.render(in: context)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image!
}
并制作一个带有空格和精确长度的字符串，
fileprivate func whitespaceString(font: UIFont = UIFont.systemFont(ofSize: 15), width: CGFloat) -> String {
let kPadding: CGFloat = 20
let mutable = NSMutableString(string: "")
let attribute = [NSFontAttributeName: font]
while mutable.size(attributes: attribute).width < width - (2 * kPadding) {
mutable.append(" ")
}
return mutable as String
}
现在，您可以创建UITableViewRowAction。
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let whitespace = whitespaceString(width: kCellActionWidth)
let deleteAction = UITableViewRowAction(style: .`default`, title: whitespace) { (action, indexPath) in
// do whatever you want
}
// create a color from patter image and set the color as a background color of action
let kActionImageSize: CGFloat = 34
let view = UIView(frame: CGRect(x: 0, y: 0, width: kCellActionWidth, height: kCellHeight))
view.backgroundColor = UIColor.white
let imageView = UIImageView(frame: CGRect(x: (kCellActionWidth - kActionImageSize) / 2,
y: (kCellHeight - kActionImageSize) / 2,
width: 34,
height: 34))
imageView.image = UIImage(named: "x")
view.addSubview(imageView)
let image = view.image()
deleteAction.backgroundColor = UIColor(patternImage: image)
return [deleteAction]
}
结果将如下所示。
另一种方法是导入具有您想要用作字体的图像的自定义字体并使用UIButton.appearance。但是，除非您手动设置其他按钮的字体，否则这会影响其他按钮。
从 iOS 11 开始，它将显示此消息 [TableView] Setting a pattern color as backgroundColor of UITableViewRowAction is no longer supported.。目前它仍在工作，但在未来的更新中将无法工作。
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对于 iOS 11+，您可以使用：
func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
let deleteAction = UIContextualAction(style: .normal, title: "Delete") { (action, view, completion) in
// Perform your action here
completion(true)
}
let muteAction = UIContextualAction(style: .normal, title: "Mute") { (action, view, completion) in
// Perform your action here
completion(true)
}
deleteAction.image = UIImage(named: "icon.png")
deleteAction.backgroundColor = UIColor.red
return UISwipeActionsConfiguration(actions: [deleteAction, muteAction])
}