分段控制在计算器

Question

我试着去让持有两个值分段控制，但我有麻烦了。我想通过在分段视图中挑选并在标签中显示的任何一侧来增加输入，但我仍然遇到错误。任何帮助？

@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

为什么在声明前使用“number1”？ 试试这个：

@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)" 

}