所有 NSTimers 运行ning 在前一个无效的计时器之后停止执行而不是继续 运行
All NSTimers running after a previous timer that has been invalidated cease execution instead of continuing to run
在我的实现中，我在 UITableView 上同时使用 运行 多个计时器，当一个计时器结束时，我将其无效并允许将其从所述视图中删除。目前我遇到的问题 运行 是当一个定时器被删除时，所有其他定时器在它之后停止执行。
public class TimerManager{
static let instance = TimerManager()
private var delegates = [TimerDelegate]()
var currentTimers = [TimerObject]()
public func timerAdded(timer: TimerObject){
self.currentTimers.append(timer)
timer.timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: #selector(persistTimer(_:)), userInfo: "\(TimerManager.instance.currentTimers.count-1)", repeats: false)
timer.isRunning = true
for delegate in delegates{
delegate.startTimer(self.currentTimers[self.currentTimers.count-1])
}
}
@objc public func persistTimer(timer: NSTimer){
if let indexString = timer.userInfo as? String{
if let index = Int(indexString){
if let currentTimer = self.currentTimers[safe: index]{
if currentTimer.isRunning{
currentTimer.timeDuration -= 1
for delegate in delegates{
delegate.timerStarted(index)
}
}
}
}
}
}
public func addTime(timerId: Int, amount: Int){
for delegate in delegates{
delegate.addTimeToTimer(timerId, amount: amount)
UIApplication.sharedApplication().cancelLocalNotification(currentTimers[timerId].notification)
currentTimers[timerId].notification.fireDate = NSDate(timeIntervalSinceNow: Double(currentTimers[timerId].timeDuration))
}
}
public func subtractTime(timerId: Int, amount: Int){
for delegate in delegates{
delegate.subtractTimeFromTimer(timerId, amount: amount)
UIApplication.sharedApplication().cancelLocalNotification(currentTimers[timerId].notification)
currentTimers[timerId].notification.fireDate = NSDate(timeIntervalSinceNow: Double(currentTimers[timerId].timeDuration))
}
}
public func removeDelegate(removedDelegate: TimerDelegate){
for i in 0..<delegates.count{
if delegates[i] === removedDelegate{
delegates.removeAtIndex(i)
}
}
}
public func cancelTimer(timerId: Int){
let currentTimer = currentTimers[timerId]
currentTimer.timer.invalidate()
UIApplication.sharedApplication().cancelLocalNotification(currentTimer.notification)
currentTimers.removeAtIndex(timerId)
}
private init() {}
}
上面就是我的TimerManager单例。
以下是我的删除逻辑：
//Delete cell functionality
public override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if( editingStyle == .Delete){
let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenWidth = screenSize.width
let screenHeight = screenSize.height
let deletedTimer = TimerManager.instance.currentTimers[indexPath.row]
if (deletedTimer.isRunning){
deletedTimer.timer.invalidate()// <-- invalidates all timers for some reason
UIApplication.sharedApplication().cancelLocalNotification(deletedTimer.notification)
}
TimerManager.instance.currentTimers.removeAtIndex(indexPath.row)
self.tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
self.tableView.frame = CGRect.init(x: 0, y: 100, width: screenWidth, height: screenHeight * 0.0625 * CGFloat(TimerManager.instance.currentTimers.count))
}
}
这是我启动计时器的方式：
public func startTimer(timer: TimerObject) {
let newIndexPath = NSIndexPath(forRow: TimerManager.instance.currentTimers.count-1, inSection: 0)
self.tableView.insertRowsAtIndexPaths([newIndexPath], withRowAnimation: .Bottom)
let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenWidth = screenSize.width
let screenHeight = screenSize.height
self.view.frame = CGRectMake(0, 100, screenWidth, screenHeight * 0.0625 * CGFloat(TimerManager.instance.currentTimers.count))
self.view.alpha = 0.95
}
这是我的 TimerObject 的组成部分：
public class TimerObject{
var alreadySet = false
var isRunning = false
var timer = NSTimer()
var timeDuration = Int()
var timerString = String()
var doneString = String()
let notification = UILocalNotification()
init(timeDuration: Int, timerString: String, doneString: String){
self.timeDuration = timeDuration
self.timerString = timerString
self.doneString = doneString
notification.alertBody = doneString
}
}
TimerObject 的实例化：
private func setTextLinks(string: String){
if let timersForInstruction = parsedOutTimers{
stepTextView.linkTextAttributes = [NSForegroundColorAttributeName : UIColor.redColor()]
for timer in timersForInstruction{
stepTextView.addLink(string.substringFromRange(timer.range)) {
let newTimer = TimerObject.init(timeDuration: timer.lowerBound * 60, timerString: self.stepTitle
newTimer.notification.fireDate = NSDate(timeIntervalSinceNow: Double(newTimer.timeDuration))
TimerManager.instance.timerAdded(newTimer)
}
}
stepTextView.processLinks()
}
}
我会说这是使用它的地方：
//where we update the cells
public func timerIsRunning(timerIndex: Int){
if let currentTimer = TimerManager.instance.currentTimers[safe: timerIndex]{
guard let cell = self.tableView.cellForRowAtIndexPath(NSIndexPath.init(
forRow: timerIndex,
inSection: 0)) as? TimerCell else { return }
if currentTimer.timeDuration > 0{
currentTimer.timeDuration -= 1
cell.timerDisplay.text = "\(currentTimer.timerString) \t\t\t - \(currentTimer.timeDuration / 60):\((currentTimer.timeDuration % 60).format("02")) + "
cell.timerDisplay.processLinks()
}else if(currentTimer.timeDuration <= 0){
currentTimer.isRunning = false
cell.timerDisplay.text = "Finished"
currentTimer.timer.invalidate()
currentTimer.notification.fireDate = NSDate(timeIntervalSinceNow: 0)
currentTimer.notification.alertBody = currentTimer.doneString
currentTimer.notification.alertAction = "Ok"
if(self.isBeingPresented()){
NSNotificationCenter.defaultCenter().postNotificationName("timerDidFinish", object: currentTimer.notification.alertBody)
}
if(UIApplicationState.Background == UIApplication.sharedApplication().applicationState){
UIApplication.sharedApplication().scheduleLocalNotification(currentTimer.notification)
}
}else{
//handle pause
}
}
}
我真诚地希望这些信息足以供您使用。
任何解决方案或替代方案都会有很大帮助。
我能够通过为每个对象实例化一个新计时器来解决我自己的问题，只有一个计时器正在更新所有对象的视图。
private var timer = NSTimer()
var isFirstTimer = false
public func timerAdded(newTimerObject: TimerObject){
if(isFirstTimer){
self.timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: #selector(persistTimers(_:)), userInfo: nil, repeats: true)
}
self.currentTimers.append(newTimerObject)
newTimerObject.isRunning = true
for delegate in delegates{
delegate.startTimer(self.currentTimers[self.currentTimers.count-1])
}
}
@objc public func persistTimers(timer: NSTimer){
for i in 0..<self.currentTimers.count{
if let currentTimer = currentTimers[safe: i]{
if(currentTimer.isRunning){
currentTimer.timeDuration -= 1
for delegate in delegates{
delegate.timerStarted(i)
}
}
}
}
}
这就是我最终在我的单例声明中所做的更改，并且
我最终删除了
currentTimer.timeDuration -= 1
从 timerStarted 函数到 persistTime 函数的行...我意识到我的实现和风格有很多不足之处，但这是一个开始。毕竟 iOS 编程才 2 周。
编辑：
我添加的 "[safe: ]" 扩展用于安全索引访问：
public extension CollectionType{
subscript (safe index: Index) -> Generator.Element? {
return indices.contains(index) ? self[index] : nil
}
}
在我的实现中，我在 UITableView 上同时使用 运行 多个计时器，当一个计时器结束时，我将其无效并允许将其从所述视图中删除。目前我遇到的问题 运行 是当一个定时器被删除时，所有其他定时器在它之后停止执行。
public class TimerManager{
static let instance = TimerManager()
private var delegates = [TimerDelegate]()
var currentTimers = [TimerObject]()
public func timerAdded(timer: TimerObject){
self.currentTimers.append(timer)
timer.timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: #selector(persistTimer(_:)), userInfo: "\(TimerManager.instance.currentTimers.count-1)", repeats: false)
timer.isRunning = true
for delegate in delegates{
delegate.startTimer(self.currentTimers[self.currentTimers.count-1])
}
}
@objc public func persistTimer(timer: NSTimer){
if let indexString = timer.userInfo as? String{
if let index = Int(indexString){
if let currentTimer = self.currentTimers[safe: index]{
if currentTimer.isRunning{
currentTimer.timeDuration -= 1
for delegate in delegates{
delegate.timerStarted(index)
}
}
}
}
}
}
public func addTime(timerId: Int, amount: Int){
for delegate in delegates{
delegate.addTimeToTimer(timerId, amount: amount)
UIApplication.sharedApplication().cancelLocalNotification(currentTimers[timerId].notification)
currentTimers[timerId].notification.fireDate = NSDate(timeIntervalSinceNow: Double(currentTimers[timerId].timeDuration))
}
}
public func subtractTime(timerId: Int, amount: Int){
for delegate in delegates{
delegate.subtractTimeFromTimer(timerId, amount: amount)
UIApplication.sharedApplication().cancelLocalNotification(currentTimers[timerId].notification)
currentTimers[timerId].notification.fireDate = NSDate(timeIntervalSinceNow: Double(currentTimers[timerId].timeDuration))
}
}
public func removeDelegate(removedDelegate: TimerDelegate){
for i in 0..<delegates.count{
if delegates[i] === removedDelegate{
delegates.removeAtIndex(i)
}
}
}
public func cancelTimer(timerId: Int){
let currentTimer = currentTimers[timerId]
currentTimer.timer.invalidate()
UIApplication.sharedApplication().cancelLocalNotification(currentTimer.notification)
currentTimers.removeAtIndex(timerId)
}
private init() {}
}
上面就是我的TimerManager单例。 以下是我的删除逻辑：
//Delete cell functionality
public override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if( editingStyle == .Delete){
let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenWidth = screenSize.width
let screenHeight = screenSize.height
let deletedTimer = TimerManager.instance.currentTimers[indexPath.row]
if (deletedTimer.isRunning){
deletedTimer.timer.invalidate()// <-- invalidates all timers for some reason
UIApplication.sharedApplication().cancelLocalNotification(deletedTimer.notification)
}
TimerManager.instance.currentTimers.removeAtIndex(indexPath.row)
self.tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
self.tableView.frame = CGRect.init(x: 0, y: 100, width: screenWidth, height: screenHeight * 0.0625 * CGFloat(TimerManager.instance.currentTimers.count))
}
}
这是我启动计时器的方式：
public func startTimer(timer: TimerObject) {
let newIndexPath = NSIndexPath(forRow: TimerManager.instance.currentTimers.count-1, inSection: 0)
self.tableView.insertRowsAtIndexPaths([newIndexPath], withRowAnimation: .Bottom)
let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenWidth = screenSize.width
let screenHeight = screenSize.height
self.view.frame = CGRectMake(0, 100, screenWidth, screenHeight * 0.0625 * CGFloat(TimerManager.instance.currentTimers.count))
self.view.alpha = 0.95
}
这是我的 TimerObject 的组成部分：
public class TimerObject{
var alreadySet = false
var isRunning = false
var timer = NSTimer()
var timeDuration = Int()
var timerString = String()
var doneString = String()
let notification = UILocalNotification()
init(timeDuration: Int, timerString: String, doneString: String){
self.timeDuration = timeDuration
self.timerString = timerString
self.doneString = doneString
notification.alertBody = doneString
}
}
TimerObject 的实例化：
private func setTextLinks(string: String){
if let timersForInstruction = parsedOutTimers{
stepTextView.linkTextAttributes = [NSForegroundColorAttributeName : UIColor.redColor()]
for timer in timersForInstruction{
stepTextView.addLink(string.substringFromRange(timer.range)) {
let newTimer = TimerObject.init(timeDuration: timer.lowerBound * 60, timerString: self.stepTitle
newTimer.notification.fireDate = NSDate(timeIntervalSinceNow: Double(newTimer.timeDuration))
TimerManager.instance.timerAdded(newTimer)
}
}
stepTextView.processLinks()
}
}
我会说这是使用它的地方：
//where we update the cells
public func timerIsRunning(timerIndex: Int){
if let currentTimer = TimerManager.instance.currentTimers[safe: timerIndex]{
guard let cell = self.tableView.cellForRowAtIndexPath(NSIndexPath.init(
forRow: timerIndex,
inSection: 0)) as? TimerCell else { return }
if currentTimer.timeDuration > 0{
currentTimer.timeDuration -= 1
cell.timerDisplay.text = "\(currentTimer.timerString) \t\t\t - \(currentTimer.timeDuration / 60):\((currentTimer.timeDuration % 60).format("02")) + "
cell.timerDisplay.processLinks()
}else if(currentTimer.timeDuration <= 0){
currentTimer.isRunning = false
cell.timerDisplay.text = "Finished"
currentTimer.timer.invalidate()
currentTimer.notification.fireDate = NSDate(timeIntervalSinceNow: 0)
currentTimer.notification.alertBody = currentTimer.doneString
currentTimer.notification.alertAction = "Ok"
if(self.isBeingPresented()){
NSNotificationCenter.defaultCenter().postNotificationName("timerDidFinish", object: currentTimer.notification.alertBody)
}
if(UIApplicationState.Background == UIApplication.sharedApplication().applicationState){
UIApplication.sharedApplication().scheduleLocalNotification(currentTimer.notification)
}
}else{
//handle pause
}
}
}
我真诚地希望这些信息足以供您使用。 任何解决方案或替代方案都会有很大帮助。
我能够通过为每个对象实例化一个新计时器来解决我自己的问题，只有一个计时器正在更新所有对象的视图。
private var timer = NSTimer()
var isFirstTimer = false
public func timerAdded(newTimerObject: TimerObject){
if(isFirstTimer){
self.timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: #selector(persistTimers(_:)), userInfo: nil, repeats: true)
}
self.currentTimers.append(newTimerObject)
newTimerObject.isRunning = true
for delegate in delegates{
delegate.startTimer(self.currentTimers[self.currentTimers.count-1])
}
}
@objc public func persistTimers(timer: NSTimer){
for i in 0..<self.currentTimers.count{
if let currentTimer = currentTimers[safe: i]{
if(currentTimer.isRunning){
currentTimer.timeDuration -= 1
for delegate in delegates{
delegate.timerStarted(i)
}
}
}
}
}
这就是我最终在我的单例声明中所做的更改，并且 我最终删除了
currentTimer.timeDuration -= 1
从 timerStarted 函数到 persistTime 函数的行...我意识到我的实现和风格有很多不足之处，但这是一个开始。毕竟 iOS 编程才 2 周。
编辑：
我添加的 "[safe: ]" 扩展用于安全索引访问：
public extension CollectionType{
subscript (safe index: Index) -> Generator.Element? {
return indices.contains(index) ? self[index] : nil
}
}