segmentedcontrol / textfield / DidChange

Question

我有一个segmentedControl，它为字段提供字符串。我还有另外两个文本域。一个用于用户输入，第二个用于从segmentedcontrol文本字段和用户输入文本字段进行计算。当segmentedcontrolindex发生变化时，如何自动更新计算文本字段。 对于用户输入文本字段，textfielddidchange方法有效。谢谢

@IBOutlet weak var segmentedcontrol: UISegmentedControl!



@IBOutlet weak var textf: UITextField!
@IBOutlet weak var textf1: UITextField!
@IBOutlet weak var textf2: UITextField!



override func viewDidLoad() {
    super.viewDidLoad()




    textf.delegate = self
    textf1.delegate = self
    textf2.delegate = self

    // 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.
}



@IBAction func textf1(sender: AnyObject) {


    let result = (textf.text! as NSString).doubleValue * (textf2.text! as NSString).doubleValue

    textf1.text = String(format:"%.2f", result)

}



@IBAction func segmentedcontrolAction(sender: AnyObject) {

    if(segmentedcontrol.selectedSegmentIndex == 0)
    {
        textf2.text = "5";
    }
    else if(segmentedcontrol.selectedSegmentIndex == 1)
    {
        textf2.text = "10";
    }
    else if(segmentedcontrol.selectedSegmentIndex == 2)
    {
        textf2.text = "15";
    }


}

Answer 1

@IBAction func segmentedcontrolAction(sender: AnyObject) 
{

    if(segmentedcontrol.selectedSegmentIndex == 0)
    {
        textf2.text = "5";


    }
    else if(segmentedcontrol.selectedSegmentIndex == 1)
    {
        textf2.text = "10";


    }
    else if(segmentedcontrol.selectedSegmentIndex == 2)
    {
        textf2.text = "15";


    }
       let result = (textf.text! as NSString).doubleValue * (textf2.text! as NSString).doubleValue
        textf1.text = String(format:"%.2f", result)

}