我正在继续我的计算程序,以提高我在Swift代码中的技能。现在,我遇到一个问题:我希望UISegmentedControl选择我的操作的运算符(+,-ecc ..),并且当选择一个操作符时,UIButton函数会根据UISegmentedControl的决定来计算值。
这是代码,但不起作用。
谢谢,
马泰奥
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var firstNumber: UITextField!
@IBOutlet weak var secondNumber: UITextField!
@IBOutlet weak var resultButton: UIButton!
@IBOutlet weak var resultNumber: UILabel!
@IBOutlet weak var operatorSelector: UISegmentedControl!
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.
}
@IBAction func operatorSelectorChanged(_ sender: UISegmentedControl) {
switch operatorSelector.selectedSegmentIndex {
case 0:
@IBAction func resultFunction(_ sender: AnyObject) {
if let firstNumberConv :Int = Int(firstNumber.text!), let secondNumberConv :Int = Int(secondNumber.text!) {
let result = firstNumberConv + secondNumberConv
resultNumber.text = "\(result)"
} else { resultNumber.text = "Inserire solo valori numerici"}
}
case 1:
@IBAction func resultFunction(_ sender: AnyObject) {
if let firstNumberConv :Int = Int(firstNumber.text!), let secondNumberConv :Int = Int(secondNumber.text!) {
let result = firstNumberConv - secondNumberConv
resultNumber.text = "\(result)"
} else { resultNumber.text = "Inserire solo valori numerici"}
}
default:
break;
}
}
}
最佳答案
尝试删除开关盒内带有@IBAction func ...
的行。
我认为您的@IBAction func operatorSelectorChanged
应该看起来像这样:
@IBAction func operatorSelectorChanged(_ sender: UISegmentedControl) {
switch operatorSelector.selectedSegmentIndex {
case 0:
if let firstNumberConv = Int(firstNumber.text!), let secondNumberConv = Int(secondNumber.text!) {
let result = firstNumberConv + secondNumberConv
resultNumber.text = "\(result)"
} else { resultNumber.text = "Inserire solo valori numerici"}
case 1:
if let firstNumberConv = Int(firstNumber.text!), let secondNumberConv = Int(secondNumber.text!) {
let result = firstNumberConv - secondNumberConv
resultNumber.text = "\(result)"
} else { resultNumber.text = "Inserire solo valori numerici"}
default:
break;
}
}