Swift - 带有多个 UIPickers 的 View Controller .

Question

我正在使用 swift 2.0(我也是 Swift 和 iOS 开发的新手)......

我想要一个有两个 UIPickers 的 View Controller 。谁能建议如何做到这一点？

我的 View Controller 类...

import UIKit

class CreateSessionViewController : UIViewController, UIPickerViewDataSource,UIPickerViewDelegate {

//Outlets:
@IBOutlet var durationPicker: UIPickerView!
@IBOutlet var typePicker: UIPickerView!

//Dummy duration array:
var durationArray = ["10", "20", "30", "40", "50", "60"];

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    self.durationPicker.dataSource = self;
    self.durationPicker.delegate = self;

}

//Picker view methods:
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return durationArray.count
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return durationArray[row]
}

}

现在，durationPicker 运行良好，但我将如何填充 typePicker？

Answer 1

您应该使用传递给每个委托(delegate)方法的 pickerView 对象:

//Picker view methods:
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
  if pickerView == durationPicker {
    return 1
  } else if pickerView == typePicker {
    return 2
  }

  return 0
}

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
  if pickerView == durationPicker {
    return durationArray.count
  } else if pickerView == typePicker {
    return typeArray.count
  }

  return 0
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
  if pickerView == durationPicker {
    return durationArray[row]
  } else if pickerView == typePicker {
    return typeArray[row]
  }

  return nil
}