更改ViewControllers时如何保持UISwitch状态? [英] How do i keep UISwitch state when changing ViewControllers?
问题描述
当我从一个视图控制器移动到另一个视图控制器时,第一个控制器上的开关将自行重置并且不保持其状态。
如何在查看其他控制器后返回时保存状态?如何在关闭应用程序后保存其状态。我已经查看了各种stackOverflow问题和响应以及Apple文档,但似乎没有任何工作。
When I move from one view controller to another, the switch on the first controller resets itself and does not retain its state. How can I make it save its state when come back to it after viewing other controllers? And how do I make it save its state after closing the app. I have looked at the various stackOverflow questions and responses and the apple documentation, but nothing seems to work.
这是我的具有交换机的View Controller的类。 / p>
Here is my class for the View Controller that has the switch.
class Days: UIViewController {
@IBOutlet weak var switchButton: UISwitch!
var switchState = true
let switchKey = "switchState"
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
@IBAction func saveSwitchPressed(sender:AnyObject) {
if self.switchButton.on {
self.switchState = true
NSUserDefaults.standardUserDefaults().setBool(self.switchState, forKey: switchKey)
NSUserDefaults.standardUserDefaults().synchronize()
println(NSUserDefaults.standardUserDefaults().boolForKey(switchKey))
} else {
self.switchState = false
NSUserDefaults.standardUserDefaults().setBool(self.switchState, forKey: switchKey)
NSUserDefaults.standardUserDefaults().synchronize()
println(NSUserDefaults.standardUserDefaults().boolForKey(switchKey))
}
}
}
我是Swift的初学者,通常是Xcode。提前感谢您的时间和帮助:)
I'm a beginner to Swift and generally Xcode. Thank you in advance for your time and help :)
推荐答案
Xcode 8.3•Swift 3.1
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var switchButton: UISwitch!
override func viewDidLoad() {
super.viewDidLoad()
switchButton.isOn = UserDefaults.standard.bool(forKey: "switchState")
}
@IBAction func saveSwitchPressed(_ sender: UISwitch) {
UserDefaults.standard.set(sender.isOn, forKey: "switchState")
}
}
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