无需触摸即可滑动 UITableViewCell
Swipe UITableViewCell without touch
正如我的标题所说,我想在用户出现时从左向右滑动 UITableView
的第一行 ViewController
。
在我的 ViewController
中有一个 UITableView
,每一行有两个按钮 "More" 和 "Delete" 操作。看下面的代码
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if (editingStyle == UITableViewCellEditingStyle.delete) {
}
}
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let deleteButton = UITableViewRowAction(style: .normal, title: "Delete") { action, index in
// Edit Button Action
}
deleteButton.backgroundColor = UIColor.red
let editButton = UITableViewRowAction(style: .normal, title: "Edit") { action, index in
// Delete Button Action
}
editButton.backgroundColor = UIColor.lightGray
return [deleteButton, editButton]
}
一切正常。但我希望当 end-user 第一次出现在这个 ViewController
上时,他们会通知有可用的滑动操作,因此他们会执行它。
问题是:第一行如何自动左右滑动?
我做了什么?
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let cell = posTblView.cellForRow(at: NSIndexPath(row: 0, section: 0) as IndexPath) as! POSUserTabelCell
UIView.animate(withDuration: 0.3, animations: {
cell.transform = CGAffineTransform.identity.translatedBy(x: -150, y: 0)
}) { (finished) in
UIView.animateKeyframes(withDuration: 0.3, delay: 0.25, options: [], animations: {
cell.transform = CGAffineTransform.identity
}, completion: { (finished) in
})
}
}
通过上面的代码 swipe/moving 单元格正在工作但不显示 "Delete" 和 "More" 按钮。
所以请指导我正确的方向。
将单元格向左变换不会使操作按钮可见。
您需要通过调用单元格上的 setEditing
方法将该单元格发送到编辑模式,将其放入您的 viewDidAppear
:
let cell = posTblView.cellForRow(at: IndexPath(row: 0, section: 0))
cell.setEditing(true, animated: true)
我找到了一种实现它的方法。
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
if arrStudent.count > 0 {
let indexPath = NSIndexPath(row: 0, section: 0)
let cell = tblStudent.cellForRow(at: indexPath as IndexPath);
let swipeView = UIView()
swipeView.frame = CGRect(x: cell!.bounds.size.width, y: 0, width: 170, height: cell!.bounds.size.height)
swipeView.backgroundColor = .clear
let swipeEditLabel: UILabel = UILabel.init(frame: CGRect(x: 0, y: 0, width: 80, height: cell!.bounds.size.height))
swipeEditLabel.text = "Edit";
swipeEditLabel.textAlignment = .center
swipeEditLabel.font = UIFont.systemFont(ofSize: 19)
swipeEditLabel.backgroundColor = UIColor(red: 180/255, green: 180/255, blue: 180/255, alpha: 1) // Light Gray: Change color as you want
swipeEditLabel.textColor = UIColor.white
swipeView.addSubview(swipeEditLabel)
let swipeDeleteLabel: UILabel = UILabel.init(frame: CGRect(x: swipeEditLabel.frame.size.width, y: 0, width: 90, height: cell!.bounds.size.height))
swipeDeleteLabel.text = "Delete";
swipeDeleteLabel.textAlignment = .center
swipeDeleteLabel.font = UIFont.systemFont(ofSize: 19)
swipeDeleteLabel.backgroundColor = UIColor(red: 255/255, green: 41/255, blue: 53/255, alpha: 1) // Red color: Change color as you want
swipeDeleteLabel.textColor = UIColor.white
swipeView.addSubview(swipeDeleteLabel)
cell!.addSubview(swipeView)
UIView.animate(withDuration: 0.60, animations: {
cell!.frame = CGRect(x: cell!.frame.origin.x - 170, y: cell!.frame.origin.y, width: cell!.bounds.size.width + 170, height: cell!.bounds.size.height)
}) { (finished) in
UIView.animate(withDuration: 0.60, animations: {
cell!.frame = CGRect(x: cell!.frame.origin.x + 170, y: cell!.frame.origin.y, width: cell!.bounds.size.width - 170, height: cell!.bounds.size.height)
}, completion: { (finished) in
for subview in swipeView.subviews {
subview.removeFromSuperview()
}
swipeView.removeFromSuperview()
})
}
}
}
在单元格末尾添加自定义 UIView
并在动画完成后将其删除。
- 您可以根据需要设置自定义视图的框架
- 根据需要添加带有背景颜色和标题的标签。
这里你应该写代码,不是每次都调用这段代码 viewDidAppear
它应该只调用一次用于用户指示。