iphone - 如何在 Swift 的 UIPickerView 中划分三个部分

Question

我有 UIPickerView 的示例代码，其中一个部分具有整数值。我如何制作具有不同值的 3 个部分 - 整数、字符串等？我如何处理 3 个部分的 didSelectRow 方法？

import UIKit

class ViewController: UIViewController, UIPickerViewDelegate{

@IBOutlet weak var tF1: UITextField!

var progPicker=UIPickerView()

override func viewDidLoad() {
    super.viewDidLoad()

    progPicker.frame=CGRectMake(50, 50, 50, 162)
    progPicker.delegate=self
    progPicker.tag = 101
    progPicker.selectRow(180, inComponent: 0, animated: true)
    self.view.addSubview(progPicker)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

func numberOfComponentsInPickerView(pickerView: UIPickerView!) -> Int {
    return 1
}

func pickerView(pickerView: UIPickerView!, numberOfRowsInComponent component: Int) -> Int {
    return 250
}

func pickerView(pickerView: UIPickerView!, titleForRow row: Int, forComponent component: Int) -> String
{
    return "\(row)"
}

func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int)
{
    println("Selected row: \(row)")
}
}

Answer 1

你做得对。通常组件就像 TableView 中的部分，行就是行。 didSelect 委托(delegate)方法传递所选的组件和行，因此您可以从模型中找到实际选择的特定数据。这是一个小样本，

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {


  override func viewDidLoad() {
    super.viewDidLoad()

    let pickerView = UIPickerView(frame: CGRectMake(0, 0, 320, 300))

    view.addSubview(pickerView)
    pickerView.delegate = self
    pickerView.dataSource = self
  }

  func numberOfComponentsInPickerView(pickerView: UIPickerView!) -> Int {
    return 3
  }

  func pickerView(pickerView: UIPickerView!, numberOfRowsInComponent component: Int) -> Int {
    return 10
  }

  func pickerView(pickerView: UIPickerView!, titleForRow row: Int, forComponent component: Int) -> String! {

    if component == 0{
      return "Int: \(row)"
    }else if component == 1{
      return "String: \(row)"
    }

    return "Other: \(row)"

  }

  func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int) {
    if component == 0{
      println("Int component: \(row) selected")
    }else if component == 1{
      println("String component: \(row) selected")

    }else{
      println("Other component: \(row) selected")

    }
  }

}

如果您希望自定义选择器 View ，您可以使用以下委托(delegate)。

– pickerView:attributedTitleForRow:forComponent:
– pickerView:viewForRow:forComponent:reusingView: