我目前正在为Apple Watch制作秒表。该表具有两个接口和两个控制器。 TimerController
和SwitchController
。 TimerController
运行计时器。我正在尝试从SwitchController
停止时间对象,因此做了一个函数,可以停止TimerController
中的SwitchController
中的计时器。问题是我在TimerController
中遇到致命错误,而我不知道为什么吗?
timeStopp()
中的函数timerController
返回错误:
“线程1:致命错误:展开一个可选值时意外发现nil”
查看此图片!
错误
SwipeController Swipe error
TimeController time error 1 time error 2
TimerController
import WatchKit
import Foundation
class TimerController: WKInterfaceController {
@IBOutlet weak var timerOutlet: WKInterfaceTimer!
var myTimer : Timer?
var duration : TimeInterval = 45.0 //arbitrary number. 45 seconds
var isPaused = false //flag to determine if it is paused or not
var elapsedTime : TimeInterval = 0.0 //time that has passed between
pause/resume
var startTime = NSDate()
override func awake(withContext context: Any?) {
super.awake(withContext: context)
start_timer()
timerOutlet.setTextColor(UIColor.red)
// Configure interface objects here.
}
func start_timer() {
myTimer = Timer.scheduledTimer(timeInterval: duration, target:
self,selector: Selector(("timerDone")), userInfo: nil, repeats:
false)
timerOutlet.setDate(NSDate(timeIntervalSinceNow: duration ) as
Date)
timerOutlet.start()
}
func timerDone(){
//timer done counting down
}
@IBAction func pauseResumePressed() {
//timer is paused. so unpause it and resume countdown
if isPaused{
isPaused = false
myTimer = Timer.scheduledTimer(timeInterval: duration -
elapsedTime, target: self, selector:
Selector(("timerDone")), userInfo:
nil, repeats: false)
timerOutlet.setDate(NSDate(timeIntervalSinceNow: duration -
elapsedTime) as Date)
timerOutlet.start()
startTime = NSDate()
//pauseResumeButton.setTitle("Pause")
}
//pause the timer
else{
isPaused = true
//get how much time has passed before they paused it
let paused = NSDate()
elapsedTime += paused.timeIntervalSince(startTime as Date)
//stop watchkit timer on the screen
timerOutlet.stop()
//stop the ticking of the internal timer
myTimer!.invalidate()
//do whatever UI changes you need to
//pauseResumeButton.setTitle("Resume")
}
}
override func willActivate() {
// This method is called when watch view controller is about to
be visible to user
super.willActivate()
}
override func didDeactivate() {
// This method is called when watch view controller is no
longer visible
super.didDeactivate()
}
}
更新 SwipeController
import WatchKit
import Foundation
class SwipeController: WKInterfaceController {
//@IBOutlet weak var myTimer: WKInterfaceTimer!
var timer = TimerController()
override func awake(withContext context: Any?) {
super.awake(withContext: context)
// Configure interface objects here.
}
override func willActivate() {
// This method is called when watch view controller is about to
be visible to user
super.willActivate()
}
override func didDeactivate() {
// This method is called when watch view controller is no
longer visible
super.didDeactivate()
}
/stopp call is made here
@IBAction func PauseButton() {
timer.pauseResumePressed()
}
}
答案 0 :(得分:0)
首先导入通知中心。 在左侧的项目浏览器中单击您的项目。通常,请转到“链接的框架和库”。点击+按钮,然后搜索通知中心,然后添加框架
删除整个
TimerViewController
并粘贴以下内容:https://gist.github.com/rawandahmad698/a0095e584eaa4df278a23c92e71cca62删除整个
SwipeViewController
并粘贴以下内容:https://gist.github.com/rawandahmad698/9ac0b7a411b7e88ff44068938a0b250a
首先。在代码末尾添加到您的TimerController
:
import NotificationCenter
extension Notification.Name {
static let stopTimer = Notification.Name("stopTimer")
}
之后。在您的SwipeController
上编辑以下行:
@IBAction func PauseButton() {
// Post notification:
let userInfo = ["foo": 1, "bar": "baz"] as [String: Any] // you could also transfer data
NotificationCenter.default.post(name: .stopTimer, object: nil, userInfo: userInfo)
}
最后。在您的TimerController
上将其添加到willActivate()
NotificationCenter.default.addObserver(self, selector: #selector(stop_timer(notification:)), name: .stopTimer, object: nil)
不要忘记:将此添加到willActivate()
func stop_timer(notification:NSNotification) {
// Timer is paused. so unpause it and resume countdown
if isPaused {
isPaused = false
timerOutlet.start()
startTime = NSDate()
} else {
isPaused = true
// Stop watchkit timer on the screen
timerOutlet.stop()
// Stop the ticking of the internal timer
myTimer!.invalidate()
// Do whatever UI changes you need to
}
}
您不能使尚未安排的计时器失效。 首先添加一个NSTimer:
import WatchKit
import Foundation
class TimerController: WKInterfaceController {
@IBOutlet weak var timerOutlet: WKInterfaceTimer!
var myTimer : NSTimer?
var duration : NSTimeInterval = 45.0 //arbitrary number. 45 seconds
// UPDATE
var isPaused = false //flag to determine if it is paused or not
var elapsedTime : NSTimeInterval = 0.0 //time that has passed between pause/resume
var startTime = NSDate()
override func awake(withContext context: Any?) {
super.awake(withContext: context)
timerOutlet.setTextColor(UIColor.red)
// Configure interface objects here.
}
使用按钮暂停计时器:
@IBAction func pauseResumePressed() {
//timer is paused. so unpause it and resume countdown
if isPaused{
isPaused = false
myTimer = NSTimer.scheduledTimerWithTimeInterval(duration - elapsedTime, target: self, selector: Selector("timerDone"), userInfo: nil, repeats: false)
timerOutlet.setDate(NSDate(timeIntervalSinceNow: duration - elapsedTime))
timerOutlet.start()
startTime = NSDate()
pauseResumeButton.setTitle("Pause")
}
//pause the timer
else{
isPaused = true
//get how much time has passed before they paused it
let paused = NSDate()
elapsedTime += paused.timeIntervalSinceDate(startTime)
//stop watchkit timer on the screen
timerOutlet.stop()
//stop the ticking of the internal timer
myTimer!.invalidate()
//do whatever UI changes you need to
pauseResumeButton.setTitle("Resume")
}
}
启动计时器:
func start_timer() {
myTimer = NSTimer.scheduledTimerWithTimeInterval(duration, target: self,selector: Selector("timerDone"), userInfo: nil, repeats: false)
timerOutlet.setDate(NSDate(timeIntervalSinceNow: duration ))
timerOutlet.start()
}
timer
完成时。该块被调用
func timerDone(){
//timer done counting down
}