当用户在动态表视图中触摸单元格时，我需要执行一个 Popover 转场。但是当我尝试使用以下代码时：
- (void)tableView:(UITableView *)tableview didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self performSegueWithIdentifier:@"toThePopover" sender:[tableView cellForRowAtIndexPath]];
//...
}
我尝试手动从动态的 TableView 进行弹出式转场，但是出现了错误：
配置不合法
没有锚点的弹出式转场
有没有什么方法可以实现这个功能？
今晚我也面临了同样的问题，有几种解决方法（其中包括以老式方式呈现弹出框）。
对于这个示例，我有一个对象存储在我的自定义单元格类中。当选择该单元格时，我调用以下函数打开一个弹出视图控制器，显示关于该对象的详细信息，并将其指向表格中相应的单元格。
- (void)openCustomPopOverForIndexPath:(NSIndexPath *)indexPath{
CustomViewController* customView = [[self storyboard] instantiateViewControllerWithIdentifier:@"CustomViewController"];
self.myPopOver = [[UIPopoverController alloc]
initWithContentViewController:customView];
self.myPopOver.delegate = self;
//Get the cell from your table that presents the popover
MyCell *myCell = (MyCell*)[self.tableView cellForRowAtIndexPath:indexPath];
CGRect displayFrom = CGRectMake(myCell.frame.origin.x + myCell.frame.size.width, myCell.center.y + self.tableView.frame.origin.y - self.tableView.contentOffset.y, 1, 1);
[self.myPopOver presentPopoverFromRect:displayFrom
inView:self.view permittedArrowDirections:UIPopoverArrowDirectionLeft animated:YES];
}
- (void)openCustomPopOverForIndexPath:(NSIndexPath *)indexPath{
//Get the cell from your table that presents the popover
MyCell *myCell = (MyCell*)[self.tableView cellForRowAtIndexPath:indexPath];
//Make the rect you want the popover to point at.
CGRect displayFrom = CGRectMake(myCell.frame.origin.x + myCell.frame.size.width, myCell.center.y + self.tableView.frame.origin.y - self.tableView.contentOffset.y, 1, 1);
//Now move your anchor button to this location (again, make sure you made your constraints allow this)
self.popOverAnchorButton.frame = displayFrom;
[self performSegueWithIdentifier:@"CustomPopoverSegue" sender:myCell];
}
然后...... 瞧！现在你正在使用segue的魔力，拥有动态锚点，它似乎指向你的单元格。
现在在-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender中，您可以将sender简单地转换为您单元格的类（前提是您对sender类型进行适当检查并确定调用哪个segue），并将segue的destinationViewController设置为该单元格的对象。
如果这有帮助，请告诉我，或者任何人有任何反馈或改进意见。
我想提供一种用代码而不是segue来呈现弹出视图的替代方法，虽然它与被触摸的单元格有关。这个方法非常简单，并且在iOS 4到iOS 7中都可以使用：
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:NO];
//get the data of the row they clicked from the array
Url* clickedRec = [self.resultsArray objectAtIndex:indexPath.row];
//hide the popover in case it was already opened from a previous touch.
if (self.addNewPopover.popoverVisible) {
[self.addNewPopover dismissPopoverAnimated:YES];
return;
}
//instantiate a view controller from the storyboard
AddUrlViewController *viewControllerForPopover =
[self.storyboard instantiateViewControllerWithIdentifier:@"addUrlPopup"];
//set myself as the delegate so I can respond to the cancel and save touches.
viewControllerForPopover.delegate=self;
//Tell the view controller that this is a record edit, not an add
viewControllerForPopover.addOrEdit = @"Edit";
//Pass the record data to the view controller so it can fill in the controls
viewControllerForPopover.existingUrlRecord = clickedRec;
UIPopoverController *popController = [[UIPopoverController alloc]
initWithContentViewController:viewControllerForPopover];
//keep a reference to the popover since I'm its delegate
self.addNewPopover = popController;
//Get the cell that was clicked in the table. The popover's arrow will point to this cell since it was the one that was touched.
UITableViewCell *clickedCell = [self.tableView cellForRowAtIndexPath:indexPath];
//present the popover from this cell's frame.
[self.addNewPopover presentPopoverFromRect:clickedCell.frame inView:self.myTableView permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let fromRect:CGRect = self.tableView.rectForRowAtIndexPath(indexPath)
let popoverVC = storyboard?.instantiateViewControllerWithIdentifier("popoverEdit") as! UIViewController
popoverVC.modalPresentationStyle = .Popover
presentViewController(popoverVC, animated: true, completion: nil)
let popoverController = popoverVC.popoverPresentationController
popoverController!.sourceView = self.view
popoverController!.sourceRect = fromRect
popoverController!.permittedArrowDirections = .Any
}
然后在表格视图单元格的按钮触摸中执行：
private func presentCleaningDateDatePicker(from button: UIButton) {
performSegue(withIdentifier: "Date Picker Popover Segue", sender: button)
}
并实现prepare(for segue)方法
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let identifier = segue.identifier {
switch identifier {
case "Date Picker Popover Segue":
if let vc = segue.destination as? DatePickerViewController {
if let ppc = vc.popoverPresentationController {
ppc.sourceView = sender as! UIButton
ppc.sourceRect = (sender as! UIButton).frame
ppc.delegate = vc
vc.minimumDate = Date()
vc.maximumDate = Date().addMonth(n: 3)
vc.delegate = self
}
}
default:
break
}
}
}
webView内特定“div”的弹出窗。我不使用frames，而是采用约束和自动布局，这样更容易实现。 - Mike KeskinovCGPoint popoverCentre = CGPointMake(cell.center.x, cell.center.y + self.tableView.contentOffset.y); [self.popoverAnchorButton setCenter:popoverCentre];- matt_s