我有两个UIPickerControllers 在一个视图控制器中。我可以让一个工作，但是当我添加第二个时，我的应用程序崩溃了。这是我用于一个选择器视图的代码：
import UIKit
class RegisterJobPosition: UIViewController, UIPickerViewDelegate {
@IBOutlet weak var positionLabel: UILabel!
var position = ["Lifeguard", "Instructor", "Supervisor"]
override func viewDidLoad() {
super.viewDidLoad()
}
func numberOfComponentsInPickerView(PickerView: UIPickerView!) -> Int
{
return 1
}
func pickerView(pickerView: UIPickerView!, numberOfRowsInComponent component: Int) -> Int
{
return position.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String!
{
return position[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
positionLabel.text = position[row]
}
}
现在，我怎样才能让第二个选择器工作呢？假设我的第二个选择器视图被称为location（另一个叫做position）。我尝试在选择器视图方法中复制代码location但它不起作用。
这是我的解决方案：
- 在故事板中添加两个
UIPickerView您的视图的实例
- 将第一个选择器的标签设置为
1并设置2对于“属性检查器”下的第二个选择器
-
control + drag from each picker to the top yellow view controller icon and choose
dataSource. Repeat the same choosing delegate
-
add UIPickerViewDataSource and UIPickerViewDelegate到你的视图控制器：
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
-
在视图控制器类中，为选择器创建空数组：
var picker1Options = []
var picker2Options = []
-
In viewDidLoad()，用您的内容填充数组：
picker1Options = ["Option 1","Option 2","Option 3","Option 4","Option 5"]
picker2Options = ["Item 1","Item 2","Item 3","Item 4","Item 5"]
-
实现委托和数据源方法：
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if pickerView.tag == 1 {
return picker1Options.count
} else {
return picker2Options.count
}
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
if pickerView.tag == 1 {
return "\(picker1Options[row])"
} else {
return "\(picker2Options[row])"
}
}
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