Swift:如何在Swift中使用三个组件设置UIPickerView的默认值？

Question

如何在Swift中设置选择器视图的起始行？我看到有一个Objective C的代码,但我不明白.如果有人能解释我如何将Objective C代码翻译成Swift,这也很棒!

谢谢

Answer 1

这是我在其中一个应用中使用的代码:

// Declare the outlet to the picker in your storyboard
@IBOutlet var myPicker: UIPickerView!

//...

override func viewDidLoad() {
//...
    myPicker.selectRow(row, inComponent: 0, animated: true)
}

显然,更换row和0使用任何你想要的值.

希望这可以帮助!

Answer 2

@IBOutlet weak var mPicker: UIPickerView!
var items: [String] = ["NoName1","NoName2","NoName3"] // Set through another ViewController
var itemAtDefaultPosition: String?  //Set through another ViewController

//..
//..

var defaultRowIndex = find(items,itemAtDefaultPosition!)
if(defaultRowIndex == nil) { defaultRowIndex = 0 }
mPicker.selectRow(defaultRowIndex!, inComponent: 0, animated: false)

Answer 3

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函数“SetDefaultValue”将通过在用于填充选取器视图的 pickerData 中查找项目位置，将 pickerView 定位在所需的字符串上。在此示例中，它将是“项目 2”

var pickerView = UIPickerView()
var pickerData = ["item 1","item 2","item 3","item 4","item 5"]
var defaultItem = "item 2"

func setDefaultValue(item: String, inComponent: Int){
 if let indexPosition = pickerData.firstIndex(of: item){
   pickerView.selectRow(indexPosition, inComponent: inComponent, animated: true)   
 }
}