我有一个UISwitch
,我想控制我写的函数中的布尔值。我查看了UISwitch
类型参考,并将交换机的开/关状态属性列为on
。我试图在动作中使用它:如何将布尔值链接到UISwitch的开/关状态?
@IBAction func switchValueChanged(sender: UISwitch) {
if acsessabilitySwitch.on {
//accessibilitySwitch is the UISwitch in question
println("It's True!")
advice.isInProduction = Bool (true)
// isInProduction is a attribute of a class
} else {
println("It's False!")
advice.isInProduction = Bool (false)
}
但是当我运行它并击中开关时,它崩溃并且没有打印任何东西。
编辑: 这里是我的ViewController和我的自定义类文件:
BuyingAdviceModel.swift:
import Foundation
class videoGameModel{
var price : Double
var isInProduction : Bool
var adviceGiven: String?
init (isInProduction : Bool, price: Double){
self.price = price
self.isInProduction = isInProduction
}
func giveAdvice (price:Double, isInProduction:Bool)->(adviceGiven:String){
if price >= 199.99 {
var adviceGiven = "Nope, that's too expensive!"
return adviceGiven
} else if price <= 99.99{
if isInProduction == true {
var adviceGiven = ("Buy it at GameStop!")
return adviceGiven
} else {
var adviceGiven = ("Go look online!")
return adviceGiven
}
} else {
var adviceGiven = ("Are you sure you put the info in correctly?")
return adviceGiven
}
}
}
ViewController.swift:
import UIKit
import Foundation
class ViewController: UIViewController {
@IBOutlet var priceTextField: UITextField
@IBAction func adviceButtonTapped(sender: AnyObject) {
let adviceOutputed = advice.adviceGiven!
adviceLabel.text=adviceOutputed
}
@IBAction func viewTapped(sender: AnyObject) {
priceTextField.resignFirstResponder()
}
@IBOutlet var acsessabilitySwitch: UISwitch
@IBOutlet var adviceLabel: UILabel
@IBAction func switchValueChanged (sender: UISwitch) {
advice.isInProduction = sender.on
println ("It's " + advice.isInProduction.description + "!")
}
var advice = videoGameModel (isInProduction: true,price: 0.00)
func refreshUI(){
priceTextField.text = String(advice.price)
adviceLabel.text = ""
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
refreshUI()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
为什么你使用'acsessabilitySwitch'代替'sender'一个rgument?也许你忘了连接它的IBOutlet。另外,你为什么要做“布尔(真)”而不是“真”?最后,为什么不只是做'advice.isInProduction = sender.on'? – slazyk