ios - UIPickerView 没有注册正确的最后一行。 swift 2.0

Question

我有 2 个 UIPickerView，一个叫 dayPicker，你可以在 1-12 之间选择，而 durationPicker 可以选择天、周、月和年。

代码如下:

class AddNewViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate, UITextFieldDelegate {
    @IBOutlet weak var dayPicker: UIPickerView!
    @IBOutlet weak var durationPicker: UIPickerView!
    var durationDay: Double?
    var durationType: String?

    var durationPickerDataSource = ["Day(s)","Week(s)","Month(s)","Year(s)"];
     var dayPickerDataSource = ["1","2","3","4","5","6","7","8","9","10","11","12"];


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

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    if pickerView == durationPicker {
        return durationPickerDataSource.count;
    }
    else {
        return dayPickerDataSource.count;
    }
}


func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    if pickerView == durationPicker{
        durationType = durationPickerDataSource[row]
        print("")
        print("")
        print("\(row): type == \(durationType)")
        print("\(row)")
        print("")
        print("")

        return durationType
    }
    else {
        durationDay = Double(dayPickerDataSource[row])
        return dayPickerDataSource[row]
    }
}
 override func viewDidLoad() {
        super.viewDidLoad()

        self.durationPicker.dataSource = self;
        self.durationPicker.delegate = self;
        self.dayPicker.dataSource = self;
        self.dayPicker.delegate = self;
    }
}

当我在模拟器中选择行时，它会正确打印除最后一行打印“Week(s)”之外的所有行。

我对选择器有以下限制:

日期选择器:

持续时间选择器:

Answer 1

复制了你的代码，一切正常。我唯一的猜测是您正在修改数据源，因此选择器委托(delegate)返回了错误的信息。

我测试了你的代码(没有修改)，选择器显示正确的值...

编辑:

从评论部分看来，问题在于没有指定 UIPickerView 的 didSelectRow 方法，添加它似乎解决了 OP 的问题(无法详细说明“为什么”虽然......):

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

    if pickerView == self.dayPicker{
      print("picked \(dayPickerDataSource[row])")
    }else {
      print("picked \(durationPickerDataSource[row])")
    }

  }