Swift UIPickerView 使用 IBAction 触发 Segue答案

【问题标题】：Swift UIPickerView Trigger Segue with IBActionSwift UIPickerView 使用 IBAction 触发 Segue
【发布时间】：2015-10-11 21:10:52
【问题描述】：

我是 Swift 新手，可以就如何在按钮单击时使用 IBAction 触发 segue 提出一些建议。我可以使用选择器进行转场，但我希望按钮触发转场。我尝试在 IBAction 中触发该功能，但这不起作用。感谢任何建议。谢谢。

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

    switch (row) {

    case 0: self.performSegueWithIdentifier("Segue0", sender: self)
    break;
    case 1: self.performSegueWithIdentifier("Segue1", sender: self)
    break;
    case 2: self.performSegueWithIdentifier("Segue2", sender: self)
    break;
    case 3: self.performSegueWithIdentifier("Segue3", sender: self)
    break;
    case 4: self.performSegueWithIdentifier("Segue4", sender: self)
    break;
    default: break;

    }

这是标准按钮：

@IBAction func selectButton(sender: AnyObject) {


}

【问题讨论】：

标签： ios iphone swift uipickerview ibaction

【解决方案1】：

如果您要查找的只是如何确定从按钮功能中选择了哪一行，您可以使用UIPickerView.selectedRowInComponent(_:):

@IBOutlet weak var picker: UIPickerView! // Reference to picker from storyboard. 
@IBAction func selectButton(sender: AnyObject) {
    // Get the selected row. You only have one component, so the parameter is 0.
    let row = picker.selectedRowInComponent(0)

    // Switch block here
}

如果实际上您的转场实际上命名为“Segue0”、“Segue1”等，那么您可以将 switch 块替换为：

self.performSegueWithIdentifier("Segue\(row)", sender: self)

但是，如果您使用更具描述性的 segue 名称（正如我希望的那样），那么您也可以将 segue 标识符存储在一个数组中，然后使用 row 作为数组的索引：

let segues = ["thisIsASegue", "thisIsAnotherSegue", "etc"]

// In the function:
self.performSegueWithIdentifier(segues[row], sender: self)

【讨论】：

感谢您的信息。是的，我在我的生产应用程序中使用了更具描述性的 segue 名称。我会研究 UIPickerView.selectedRowInComponent。

【解决方案2】：

我设法使用以下方法使其正常工作。将不胜感激任何 cmets 或更优雅的解决方案。 :)

添加了一个全局变量来保存选择器行：

var rowSelected = 0
var pickerData: [String] = [String]()

override func viewDidLoad() {
    super.viewDidLoad()

    // Connect data:
    self.locationPicker.delegate = self
    self.locationPicker.dataSource = self

pickerData = ["Location 1", "Location 2", "Location 3", "Location 4", "Location 5"]

// The number of columns of data
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}

// The number of rows of data
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return pickerData.count
}

// The data to return for the row and component (column) that's being passed in
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return "\(pickerData[row])"

}
// Capture the picker view selection
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

    rowSelected = row


}
@IBAction func selectButton(sender: AnyObject) {

    switch (rowSelected) {

    case 0: self.performSegueWithIdentifier("Segue0", sender: self)
    break;
    case 1: self.performSegueWithIdentifier("Segue1", sender: self)
    break;
    case 2: self.performSegueWithIdentifier("Segue2", sender: self)
    break;
    case 3: self.performSegueWithIdentifier("Segue3", sender: self)
    break;
    case 4: self.performSegueWithIdentifier("Segue4", sender: self)
    break;
    default: break;




}

【讨论】：