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所以今天我一直在研究一個溫度轉換器應用程序，以便將我自己介紹到我迄今在swift中學到的概念（我目前正在上課的過程中），我決定添加一個選擇器視圖。我沒有任何錯誤，但是當我按下UIButton時，它不會響應我代碼中列出的任何if語句 - 這是所有溫度轉換的地方。所以我的問題是，爲什麼按下按鈕時沒有轉換在文本字段中輸入的溫度，我該如何解決？由於特殊的選取器視圖/功能/行動問題
代碼：
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 = ""
}
}
歡迎堆棧溢出。如果我的答案解決了您的問題，請點擊旁邊的複選標記將其變爲綠色。 http://meta.stackexchange.com/questions/5234/how-does-accepting-an-answer-work/5235#5235 – vacawama