[英]stoping timer on viewcontroller dismiss swift
I have a timer in a view controller which I use to check a function. 我在视图控制器中有一个计时器,用于检查功能。 How ever, If I dismiss the Viewcontroller where the timer is set, it still continues or if the time reaches zero, I want to automatically dismiss the viewcontroller. 但是,如果我关闭设置了计时器的Viewcontroller,它仍然继续,或者如果时间到零,我想自动关闭Viewcontroller。 In my case now, if I dismiss the viewcontroller manually without the viewcontroller reaching zero, the time still continues till the counter reaches ero. 在我现在的情况下,如果我在视图控制器未达到零的情况下手动关闭视图控制器,则时间仍将持续到计数器达到ero为止。
how can I set my code such that if I dismiss the Viewcontroller myself, the time stops and not reach zero so that the condition I put if the time is zero does not run. 我该如何设置代码,以便如果我自己解雇Viewcontroller,时间将停止并且不会达到零,从而使我在时间为零时所处的条件无法运行。
below is my code 下面是我的代码
override func viewDidLoad() {
super.viewDidLoad()
var _ = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(updateCounter), userInfo: nil, repeats: true)
timerLabel.text = "\(counter)"
}
@objc func updateCounter() {
//you code, this is an example
if counter >= 0 {
timerLabel.text = "\(counter)"
counter -= 1
}
if counter == 0 {
Print.HOMEPRINT("COUNTER GOT TO ZERO")
dismiss(animated: true, completion: nil)
}
}
declare a public variable for timer and then invalidate it when you want to stop. 为计时器声明一个公共变量,然后在要停止时使其无效。
var timer : Timer?
override func viewDidLoad() {
super.viewDidLoad()
timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(updateCounter), userInfo: nil, repeats: true)
timerLabel.text = "\(counter)"
}
@objc func updateCounter() {
//you code, this is an example
if counter >= 0 {
timerLabel.text = "\(counter)"
counter -= 1
}
if counter == 0 {
timer?.invalidate()
Print.HOMEPRINT("COUNTER GOT TO ZERO")
dismiss(animated: true, completion: nil)
}
}
Create a global variable for Timer 为Timer创建一个全局变量
var myTimer : Timer?
override func viewDidLoad() {
super.viewDidLoad()
myTimer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(updateCounter), userInfo: nil, repeats: true)
timerLabel.text = "\(counter)"
}
@objc func updateCounter() {
//you code, this is an example
if counter >= 0 {
timerLabel.text = "\(counter)"
counter -= 1
}
if counter == 0 {
if (myTimer != nil)
{
myTimer?.invalidate()
myTimer = nil
}
Print.HOMEPRINT("COUNTER GOT TO ZERO")
dismiss(animated: true, completion: nil)
}
}
//MARK: Manually dismiss controller // MARK:手动关闭控制器
@objc func dismissButtonTapped()
{
if (myTimer != nil)
{
myTimer?.invalidate()
myTimer = nil
}
dismiss(animated: true, completion: nil)
}
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