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1

I'm using this code to show the time in a NSLabel:

Model

func startClock() 
 timer = Timer(timeInterval: 1.0, target: self, selector: #selector(fireAction), userInfo: nil, repeats: true)
 RunLoop.current.add(timer!, forMode: RunLoop.Mode.common)
 timer?.tolerance = 0.05
 fireAction()


@objc dynamic func fireAction() 
 delegate?.timeToUpdateClock(self)

ViewController

extension ViewController: ClockWorksProtocol 
 func timeToUpdateClock(_ timer: ClockWorks) 
 tick()
 


 func tick() 
 clockDateLabel.stringValue = DateFormatter.localizedString(from: Date(), dateStyle: .full, timeStyle: .none)
 clockTimeLabel.stringValue = DateFormatter.localizedString(from: Date(), dateStyle: .none, timeStyle: .medium)

Everything seems to work pretty well but unfortunately the seconds shown are not synchronized with the seconds you see in the clock on the menu bar. This happens I think, because I update the clock every second but user don't click when the second is right to start but in a casual interval from a second and the next second (I'm using a timeInterval for the timer of 1.0).

I could change the timeInterval of the timer from 1.0 to 0.1 seconds. This seems to work but I'm afraid this could be too much resource consuming.

I post two screenshots made at the same time. Them show two different time (the seconds):

How could I fix the gap?

swift macos timer clock

share|improve this question

edited Mar 27 at 18:36

Cue

asked Mar 27 at 17:20

CueCue

1,2802020 silver badges3333 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not synchronized in what sense? Date() is the time on the clock. It is now, plain and simple.
  
  – matt
  Mar 27 at 17:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I matt, I edited the question to make it more clear. Thank you.
  
  – Cue
  Mar 27 at 17:37
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Instead of a blindly repeating timer, look to see what time it is now and set an interval to fire once at the start of the next second.
  
  – matt
  Mar 27 at 20:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi matt, thank you for the useful comment, are you so kind to create an answer so than I can accept it? If you can also add an example to clarify the technique you suggest.
  
  – Cue
  Apr 26 at 10:04
  

  
  
  
  

add a comment | 

1

I'm using this code to show the time in a NSLabel:

Model

func startClock() 
 timer = Timer(timeInterval: 1.0, target: self, selector: #selector(fireAction), userInfo: nil, repeats: true)
 RunLoop.current.add(timer!, forMode: RunLoop.Mode.common)
 timer?.tolerance = 0.05
 fireAction()


@objc dynamic func fireAction() 
 delegate?.timeToUpdateClock(self)

ViewController

extension ViewController: ClockWorksProtocol 
 func timeToUpdateClock(_ timer: ClockWorks) 
 tick()
 


 func tick() 
 clockDateLabel.stringValue = DateFormatter.localizedString(from: Date(), dateStyle: .full, timeStyle: .none)
 clockTimeLabel.stringValue = DateFormatter.localizedString(from: Date(), dateStyle: .none, timeStyle: .medium)

Everything seems to work pretty well but unfortunately the seconds shown are not synchronized with the seconds you see in the clock on the menu bar. This happens I think, because I update the clock every second but user don't click when the second is right to start but in a casual interval from a second and the next second (I'm using a timeInterval for the timer of 1.0).

I could change the timeInterval of the timer from 1.0 to 0.1 seconds. This seems to work but I'm afraid this could be too much resource consuming.

I post two screenshots made at the same time. Them show two different time (the seconds):

How could I fix the gap?

swift macos timer clock

share|improve this question

edited Mar 27 at 18:36

Cue

asked Mar 27 at 17:20

CueCue

1,2802020 silver badges3333 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not synchronized in what sense? Date() is the time on the clock. It is now, plain and simple.
  
  – matt
  Mar 27 at 17:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I matt, I edited the question to make it more clear. Thank you.
  
  – Cue
  Mar 27 at 17:37
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Instead of a blindly repeating timer, look to see what time it is now and set an interval to fire once at the start of the next second.
  
  – matt
  Mar 27 at 20:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi matt, thank you for the useful comment, are you so kind to create an answer so than I can accept it? If you can also add an example to clarify the technique you suggest.
  
  – Cue
  Apr 26 at 10:04
  

  
  
  
  

add a comment | 

I'm using this code to show the time in a NSLabel:

Model

func startClock() 
 timer = Timer(timeInterval: 1.0, target: self, selector: #selector(fireAction), userInfo: nil, repeats: true)
 RunLoop.current.add(timer!, forMode: RunLoop.Mode.common)
 timer?.tolerance = 0.05
 fireAction()


@objc dynamic func fireAction() 
 delegate?.timeToUpdateClock(self)

ViewController

extension ViewController: ClockWorksProtocol 
 func timeToUpdateClock(_ timer: ClockWorks) 
 tick()
 


 func tick() 
 clockDateLabel.stringValue = DateFormatter.localizedString(from: Date(), dateStyle: .full, timeStyle: .none)
 clockTimeLabel.stringValue = DateFormatter.localizedString(from: Date(), dateStyle: .none, timeStyle: .medium)

Everything seems to work pretty well but unfortunately the seconds shown are not synchronized with the seconds you see in the clock on the menu bar. This happens I think, because I update the clock every second but user don't click when the second is right to start but in a casual interval from a second and the next second (I'm using a timeInterval for the timer of 1.0).

I could change the timeInterval of the timer from 1.0 to 0.1 seconds. This seems to work but I'm afraid this could be too much resource consuming.

I post two screenshots made at the same time. Them show two different time (the seconds):

How could I fix the gap?

swift macos timer clock

share|improve this question

edited Mar 27 at 18:36

Cue

asked Mar 27 at 17:20

CueCue

1,2802020 silver badges3333 bronze badges

func startClock() 
 timer = Timer(timeInterval: 1.0, target: self, selector: #selector(fireAction), userInfo: nil, repeats: true)
 RunLoop.current.add(timer!, forMode: RunLoop.Mode.common)
 timer?.tolerance = 0.05
 fireAction()


@objc dynamic func fireAction() 
 delegate?.timeToUpdateClock(self)

extension ViewController: ClockWorksProtocol 
 func timeToUpdateClock(_ timer: ClockWorks) 
 tick()
 


 func tick() 
 clockDateLabel.stringValue = DateFormatter.localizedString(from: Date(), dateStyle: .full, timeStyle: .none)
 clockTimeLabel.stringValue = DateFormatter.localizedString(from: Date(), dateStyle: .none, timeStyle: .medium)

share|improve this question

edited Mar 27 at 18:36

Cue

asked Mar 27 at 17:20

CueCue

1,2802020 silver badges3333 bronze badges

share|improve this question

edited Mar 27 at 18:36

Cue

asked Mar 27 at 17:20

CueCue

1,2802020 silver badges3333 bronze badges

asked Mar 27 at 17:20

CueCue

1,2802020 silver badges3333 bronze badges

asked Mar 27 at 17:20

CueCue

1,2802020 silver badges3333 bronze badges