Sahar Vanunu Sahar Vanunu - 1 month ago 10
Swift Question

swift UIAlertController with pickerView button action stay up

I am new in swift and I am trying to make

UIAlertContoller
with
PickerView

but I have problems with the Buttones,
Here a photo

enter image description here

when i am trying to change the constraint the buttons stay up
i read a lot of answers here but i did not find any solotuin

Here is my code:

func distance(){
let editRadiusAlert = UIAlertController(title: "Choose distance", message: "", preferredStyle: UIAlertControllerStyle.alert)
let pickeViewFrame: CGRect = CGRect(x: 0, y: 0, width: 250, height: 300)
let pickerViewRadius: UIPickerView = UIPickerView(frame: pickeViewFrame)
pickerViewRadius.delegate = self
pickerViewRadius.dataSource = self
editRadiusAlert.view.addSubview(pickerViewRadius)
editRadiusAlert.addAction(UIAlertAction(title: "Done", style: UIAlertActionStyle.default,handler:nil))
editRadiusAlert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.cancel, handler: nil))
editRadiusAlert.view.addConstraint(NSLayoutConstraint(item: editRadiusAlert.view, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant: self.view.frame.height * 0.5))
self.present(editRadiusAlert, animated: true, completion: nil)
}

Answer

Instead of adding pickerView as subview try to set contentViewController of UIAlertController like this.

let vc = UIViewController()
vc.preferredContentSize = CGSize(width: 250,height: 300)
let pickerView = UIPickerView(frame: CGRect(x: 0, y: 0, width: 250, height: 300))
pickerView.delegate = self
pickerView.dataSource = self
vc.view.addSubview(pickerView)
let editRadiusAlert = UIAlertController(title: "Choose distance", message: "", preferredStyle: UIAlertControllerStyle.alert)
editRadiusAlert.setValue(vc, forKey: "contentViewController")
editRadiusAlert.addAction(UIAlertAction(title: "Done", style: .default, handler: nil))
editRadiusAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
self.present(editRadiusAlert, animated: true)

It's looks like below.

enter image description here