我对Swift和编程很新。
我正在尝试在文本字段中添加弹出选择器，当用户从选择器中选择项目时，他们可以按下文本字段中显示的项目，然后PopUp消失。
我已成功使用弹出日期选择器实现此功能，因为我已成功使用GutHub中的此功能。我认为为我的Pop Up Picker模仿这个代码很容易，事实证明这个代码比预期更困难。
我有一个单独的XIB文件，它使用Picker和OK按钮保存视图。然后，我有两个swift文件，一个用于PopViewController，另一个用于PopPicker。
甚至不确定此代码是否正确，但我得到的错误是我的Picker不符合协议。两个文件的代码如下。
PopEngineViewController
import UIKit
protocol EnginePickerViewControllerDelegate : class {
func enginePickerVCDismissed(string: UITextField?)
}
class PopEngineViewController: UIViewController {
@IBOutlet weak var container: UIView!
@IBOutlet weak var enginePicker: UIPickerView!
weak var delegate : EnginePickerViewControllerDelegate?
override convenience init() {
self.init(nibName: "PopEnginePicker", bundle: nil)
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func viewDidDisappear(animated: Bool) {
self.delegate?.enginePickerVCDismissed(nil)
}
}
和PopEnginePicker
import UIKit
public class PopEnginePicker : NSObject, UIPopoverPresentationControllerDelegate, EnginePickerViewControllerDelegate {
public typealias PopEnginePickerCallback = (forTextField : UITextField)->()
var enginePickerVC : PopEngineViewController
var popover : UIPopoverPresentationController?
var textField : UITextField!
var dataChanged : PopEnginePickerCallback?
var presented = false
var offset : CGFloat = 8.0
public init(forTextField: UITextField) {
enginePickerVC = PopEngineViewController()
self.textField = forTextField
super.init()
}
public func pick(inViewController : UIViewController, dataChanged : PopEnginePickerCallback) {
if presented {
return // we are busy
}
enginePickerVC.delegate = self
enginePickerVC.modalPresentationStyle = UIModalPresentationStyle.Popover
enginePickerVC.preferredContentSize = CGSizeMake(500,208)
popover = enginePickerVC.popoverPresentationController
if let _popover = popover {
_popover.sourceView = textField
_popover.sourceRect = CGRectMake(self.offset,textField.bounds.size.height,0,0)
_popover.delegate = self
self.dataChanged = dataChanged
inViewController.presentViewController(enginePickerVC, animated: true, completion: nil)
presented = true
}
}
func adaptivePresentationStyleForPresentationController(PC: UIPresentationController!) -> UIModalPresentationStyle {
return .None
}
}
我甚至不确定我是否会走错路，但是我希望它看起来像下面一样，就像我在日期选择器中所做的那样，如下面的链接所示：