选择器视图并不 return 总是正确的值

Question

我定义了一个选择器，它 return 并不总是正确的值。有时它只是有效，但大多数时候当我选择项目 pickerView returns 时，它的值是错误的。

我确实将出口委托关联到视图控制器并使用了以下代码：

import UIKit

class ViewController: UIViewController, UIPickerViewDelegate {

var categories = ["animals", "profession", "sea_animals", "food", "tools", "misc", "all"]

var cat: String = ""
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

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

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    println("cat size: \(categories.count)")
    return categories.count
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String!{
    println("cat: \(categories[row])")
      return categories[row]
}

}

它有时会起作用，但不可靠。知道我做错了什么吗？谢谢！

Answer 1

我发现了问题。有一个选择行的功能:)

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

选择器视图并不 return 总是正确的值

Picker view does not return always the right value

ios

uipickerviewdelegate