分段控制在計算器

Question

我試着去讓持有兩個值分段控制，但我有麻煩了。我想通過在分段視圖中挑選並在標籤中顯示的任何一側來增加輸入，但我仍然遇到錯誤。任何幫助？

@IBOutlet var input: UITextField! 
@IBOutlet var output: UILabel! 
@IBOutlet var controller: UISegmentedControl! 
@IBAction func convert(sender: UIButton) { 
} 






@IBAction func change(sender: AnyObject) { 
    if controller.selectedSegmentIndex == 0 { 
     result = number1 * 1 
    } 
    if controller.selectedSegmentIndex == 1 { 
     result = number1 * 5 
    } 



    let number1 = Double(input.text!) 
    label.text = "\(result)" 

} 

Answer 1

爲什麼在聲明前使用「number1」？ 試試這個：

@IBOutlet var input: UITextField! 
@IBOutlet var output: UILabel! 
var result:Double! //fixed "cannot be applied to Double and Int." problem 
@IBOutlet var controller: UISegmentedControl! 
@IBAction func convert(sender: UIButton) { 
} 


@IBAction func change(sender: AnyObject) { 
let number1 = Double(input.text!) 
    if controller.selectedSegmentIndex == 0 { 
     self.result = number1 * 1 
    } 
    if controller.selectedSegmentIndex == 1 { 
     self.result = number1 * 5 
    } 




    label.text = "\(result)" 

}