xcode 带有pickerView按钮动作的swift UIAlertController
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swift UIAlertController with pickerView button action stay up
提问by Sahar Vanunu
I am new in swift and I am trying to make UIAlertContollerwith PickerViewbut I have problems with the Buttones,
Here a photo
我是 swift 的新手，我正在尝试制作UIAlertContoller，PickerView但我对 Buttones 有问题，这是一张照片
I am trying to change the constraint of the buttons to stay up. I read a lot of answers here but I did not find any solution
我正在尝试更改按钮的约束以保持状态。我在这里阅读了很多答案，但没有找到任何解决方案
Here is my code:
这是我的代码：
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)
}
回答by Nirav D
Instead of adding pickerViewas subview try to set contentViewControllerof UIAlertControllerlike this.
取而代之的将pickerView作为子视图尝试设置contentViewController的UIAlertController这个样子。
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.
它看起来像下面。
