我做了一个自定义的UITableViewRowAction。现在我想添加一个图像而不是文本。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!
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)"
}
}
例:
您需要将UIImage设置为行动作的背景颜色,具体来说:
UIColor(patternImage: UIImage(named: "IMAGE_NAME"))
[UIColor colorWithPatternImage:[UIImage imageNamed:@"IMAGE_NAME"]];
Swift 4(iOS 11+):
iOS 11现在支持(仅)图像以显示在操作按钮中。您只需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])
}
}
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!)
}
}
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]
}
我只是实现更好的版本https://stackoverflow.com/a/48122210 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是不同的,你必须在你的函数2中计算这个。图像可以有不同的大小,所以你必须计算比例不只为了高度。所以,我的修复代码
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!)
}
delActions.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"delete.png"]];
基本图案颜色方法的问题是您的图像需要与操作按钮大小相同,或者至少在底部有一些更平坦的背景以防止图像重复(即使它将锚定在顶部,这不是很好)。
我不得不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];
}
您仍然需要设置expectedWidth,使其与您在动作标题中放置的空标签相匹配。例如:@“” - > 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。
我的变体尝试使用UImageView的contentMode行为,当这还不够时,我发现一些Core Geometry Rect方法有一些很好用,因为它们使目标帧保持在单元格框架的中心。使用眼睛测试,似乎刷卡正在移除我正常细胞宽度的一半,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:来自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)