赵新强 赵新强 - 6 months ago 23
Swift Question

show the textField in the alertController in swift

Just now I wrote the code which is provided below. I would like to produce the output for the following code but it crashes when I run it, and it shows

nil
.

class ViewController: UIViewController ,UITableViewDataSource{
var names = [String]()

@IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
title = "\"The List\""
tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "Cell")
// Do any additional setup after loading the view, typically from a nib.
}

@IBAction func addName(sender: AnyObject) {
let alert = UIAlertController(title: "New name", message: "Add one new name here", preferredStyle: .Alert)
let saveAction = UIAlertAction(title: "Save", style: .Default, handler: {(action:UIAlertAction) ->Void in
alert.addTextFieldWithConfigurationHandler{(textField:UITextField)->Void in
alert.view.endEditing(true)
let textField = alert.textFields?.last
self.names.append(textField!.text!)
self.tableView.reloadData()
}

})
let cancleAction = UIAlertAction(title: "Cancel", style: .Default, handler: {(action:UIAlertAction) ->Void in
alert.addTextFieldWithConfigurationHandler {(textFiled:UITextField) ->Void in
}
})
alert.addAction(saveAction)
alert.addAction(cancleAction)
self.presentViewController(alert,animated:true,completion:nil)

}

//MARK:-TableViewDataSource
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return names.count

}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell")
cell?.textLabel?.text = names[indexPath.row]
return cell!

}
}


How to fix it???

Answer

reference document : UIAlertController in Swift

Code for Adding textField in UIALertController :

let alertController = UIAlertController(title: "PlainTextStyle", message: "PlainTextStyle AlertView.", preferredStyle: UIAlertControllerStyle.Alert)
alertController.addTextFieldWithConfigurationHandler { (textField : UITextField) -> Void in
            textField.placeholder = "Login"
        }
let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel) { (result : UIAlertAction) -> Void in
            print("Cancel")
        }
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default) { (result : UIAlertAction) -> Void in
           print(alertController.textFields?.first?.text)
        }
alertController.addAction(cancelAction)
alertController.addAction(okAction)
self.presentViewController(alertController, animated: true, completion: nil)

TextField in UIALertController :

enter image description here