特殊的选取器视图/功能/行动问题

• Z时代
• 2024-01-10
• 分类：问答

所以今天我一直在研究一个温度转换器应用程序，以便将我自己介绍到我迄今在swift中学到的概念（我目前正在上课的过程中），我决定添加一个选择器视图。我没有任何错误，但是当我按下UIButton时，它不会响应我代码中列出的任何if语句 - 这是所有温度转换的地方。所以我的问题是，为什么按下按钮时没有转换在文本字段中输入的温度，我该如何解决？由于特殊的选取器视图/功能/行动问题

代码：

import UIKit 
class ViewController: UIViewController, UIPickerViewDelegate { 
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. 
    } 
    @IBOutlet weak var temperatureTextField: UITextField! 
    @IBOutlet weak var conversionTypePickerView: UIPickerView! 
    var temperatureConversions = ["°Farenheit-°Celcius", "°Celcius-°Farenheit", "°Farenheit-Kelvin", "Kelvin-°Farenheit", "°Celcius-Kelvin", "Kelvin-°Celcius"] 
    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int{ 
     return 1 
    } 
    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{ 
     return temperatureConversions.count 
    } 
    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! { 
     return temperatureConversions[row] 
    } 
    @IBOutlet weak var newTemperatureLabel: UILabel! 
    @IBAction func convertTemperatureButton(sender: UIButton) { 
     var temperatureTextFieldConversion = temperatureTextField.text 
     var temperatureTextFieldToDouble = Double((temperatureTextFieldConversion as NSString).doubleValue) 
    // Converts number entered from textfield into double. 
     func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int){ 
      if temperatureConversions[row] == "°Farenheit-°Celcius"{ 
      newTemperatureLabel.text = "\((temperatureTextFieldToDouble - 32)/1.8)" + " °Celcius" 
    //this is the first example of the if statements I mentioned above, other five are listed below 
      } 
      else{ 
      } 
      if temperatureConversions[row] == "°Celcius-°Farenheit"{ 
      newTemperatureLabel.text = "\(temperatureTextFieldToDouble * 1.8 + 32)" + " °Farenheit" 
      } 
      else{ 
      } 
      if temperatureConversions[row] == "°Farenheit-Kelvin"{ 
      newTemperatureLabel.text = "\(((temperatureTextFieldToDouble - 32)/1.8) + 273.15)" + " Kelvin" 
      } 
      else{ 
      } 
      if temperatureConversions[row] == "Kelvin-°Farenheit"{ 
      newTemperatureLabel.text = "\((temperatureTextFieldToDouble - 273.15) * 1.8 + 32.00)" + " °Farenheit" 
      } 
      else { 
      } 
      if temperatureConversions[row] == "°Celcius-Kelvin"{ 
      newTemperatureLabel.text = "\(temperatureTextFieldToDouble + 273.15)" + " Kelvin" 
      } 
      else{ 
      } 
      if temperatureConversions[row] == "Kelvin-°Celcius"{ 
      newTemperatureLabel.text = "\(temperatureTextFieldToDouble - 273.15)" + " °Celcius" 
      } 
      else{ 
      } 
     } 
     newTemperatureLabel.hidden = false 
     temperatureTextField.resignFirstResponder() 
     temperatureTextField.text = "" 
    } 
} 

回答：

import UIKit 
class ViewController: UIViewController, UIPickerViewDelegate { 
    var conversionType = "" 
    override func viewDidLoad() { 
     super.viewDidLoad() 
     conversionType = temperatureConversions[0] 
    } 
    // 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. 
    } 
    @IBOutlet weak var temperatureTextField: UITextField! 
    @IBOutlet weak var conversionTypePickerView: UIPickerView! 
    var temperatureConversions = ["°Farenheit-°Celcius", "°Celcius-°Farenheit", "°Farenheit-Kelvin", "Kelvin-°Farenheit", "°Celcius-Kelvin", "Kelvin-°Celcius"] 
    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int{ 
     return 1 
    } 
    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{ 
     return temperatureConversions.count 
    } 
    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! { 
     return temperatureConversions[row] 
    } 
    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int){ 
     conversionType = temperatureConversions[row] 
    } 
    @IBOutlet weak var newTemperatureLabel: UILabel! 
    // Converts number entered from textfield into double. 
    @IBAction func convertTemperatureButton(sender: UIButton) { 
     var temperatureTextFieldConversion = temperatureTextField.text 
     var temperatureTextFieldToDouble = Double((temperatureTextFieldConversion as NSString).doubleValue) 
     if conversionType == "°Farenheit-°Celcius"{ 
      newTemperatureLabel.text = "\((temperatureTextFieldToDouble - 32)/1.8)" + " °Celcius" 
      //this is the first example of the if statements I mentioned above, other five are listed below 
     } 
     if conversionType == "°Celcius-°Farenheit"{ 
      newTemperatureLabel.text = "\(temperatureTextFieldToDouble * 1.8 + 32)" + " °Farenheit" 
     } 
     if conversionType == "°Farenheit-Kelvin"{ 
      newTemperatureLabel.text = "\(((temperatureTextFieldToDouble - 32)/1.8) + 273.15)" + " Kelvin" 
     } 
     if conversionType == "Kelvin-°Farenheit"{ 
      newTemperatureLabel.text = "\((temperatureTextFieldToDouble - 273.15) * 1.8 + 32.00)" + " °Farenheit" 
     } 
     if conversionType == "°Celcius-Kelvin"{ 
      newTemperatureLabel.text = "\(temperatureTextFieldToDouble + 273.15)" + " Kelvin" 
     } 
     if conversionType == "Kelvin-°Celcius"{ 
      newTemperatureLabel.text = "\(temperatureTextFieldToDouble - 273.15)" + " °Celcius" 
     } 
     newTemperatureLabel.hidden = false 
     temperatureTextField.resignFirstResponder() 
     temperatureTextField.text = "" 
    } 
} 

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