问题
Sorry for the question without any line of code. I need advice how to proceed, if at possible that I want.
In Swift language.
Let us assume there is an app with two controllers - UITableViewController with embedded NavigationController, as the main. When you select a row in the table, opens UIViewController, which displays detailed information about the selected value.
Is it possible to do otherwise? When the application start, programmatically emulate the selection of the first row in the table and immediately display UIViewController with detailed information about the selected value. And from this controller possible to return to UITableViewController via the NavigationController.
Once again I apologize and thank you in advance!
回答1:
Yes you can do this in swift.Just load your tableViewController as usual.You just have to call
In Swift
let rowToSelect:NSIndexPath = NSIndexPath(forRow: 0, inSection: 0); //slecting 0th row with 0th section
self.tableView.selectRowAtIndexPath(rowToSelect, animated: true, scrollPosition: UITableViewScrollPosition.None);
The selectRowAtIndexPath function will not trigger delegate methods like didSelectRowAtIndexPath: so you have to manually trigger this delegate method
self.tableView(self.tableView, didSelectRowAtIndexPath: rowToSelect); //Manually trigger the row to select
Or If you are pushing ViewControllers with segue you have to trigger performSegueWithIdentifier
self.performSegueWithIdentifier("yourSegueIdentifier", sender: self);
Now you can push viewController in didSelectRowAtIndexpath.To select the first row in first section or execute whaterver you have written in didSelectRowAtIndexpath: of tableView
As For your case just push the viewController on select at 0th index with didSelectRowAtIndexPath
func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!){
if indexPath.row == 0 {
self.navigationController.pushViewController(yourViewControllerToPush, animated: YES);
}
//handle other index or whatever according to your conditions
}
It will show the view controller pushed and if you do not want to animate view controller just pass NO to pushViewController method.
On pressing Back button you will back to your viewController
In your case just write this in your viewDidAppear
if firstStart {
firstStart = false
let rowToSelect:NSIndexPath = NSIndexPath(forRow: 0, inSection: 0)
self.tableView.selectRowAtIndexPath(rowToSelect, animated: true, scrollPosition:UITableViewScrollPosition.None)
self.performSegueWithIdentifier("showForecastSelectedCity", sender: self)
}
回答2:
You can also do this simply by accessing the tableView Delegate to force "didSelectRowAtIndex" to fire
//programatically select a row to work with
self.tableView.selectRowAtIndexPath(indexPath, animated: true, scrollPosition: UITableViewScrollPosition.Top)
// Programatically selecting row does not fire the "didSelectRowAtIndexPath" function so we must manually force the firing as per below
self.tableView.delegate!.tableView!(tableView, didSelectRowAtIndexPath: indexPath!)
来源：https://stackoverflow.com/questions/24787098/programmatically-emulate-the-selection-in-uitableviewcontroller-in-swift