如何使用UIPickerview在两个视图控制器之间导航
我正在尝试使用UIPickerview在两个视图控制器之间导航，所以我首先学会了如何使用didSelectRow来更改标签的标题，然后我尝试使用一些代码导航到另一个视图控制器，但这不起作用。 / p>
我使用的代码是：
import UIKit
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
@IBOutlet var label: UILabel!
@IBOutlet var pickerView: UIPickerView!
var food = ["hello", "hi", "hey"]
var placementAnswer = 0
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
pickerView.delegate = self
pickerView.dataSource = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
public func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
public func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return food.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return food[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
placementAnswer = row
}
@IBAction func labelChanged(sender: UIButton) {
if (placementAnswer == 0){
}else if (placementAnswer == 1){
let view2 =
self.storyboard?.instantiateViewControllerWithIdentifier("view2") as! ViewController2
self.navigationController?.pushViewController(view2, animated: true)
}else if (placementAnswer == 2){
}
}
}