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I am trying to update a label field with a loop in Swift

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programming language. Can you help?...
I am trying to update a label field with a loop in Swift programming language. Can you help?
Submitted: 1 year ago.Category: Programming
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Customer reply replied 1 year ago
I am trying to update the label on view controller two with the hours/minutes/seconds that have passed after the action button on view controller one is pressed ( xcode - swift prog language)
Answered in 7 hours by:
1/3/2016
Programmer: Chris Baxter, Programming Tutor replied 1 year ago
Chris Baxter
Chris Baxter, Programming Tutor
Category: Programming
Satisfied Customers: 250
Experience: Completed BSIT concentration Software Engineering, tutored other students and classmates in Java and VB.net, C++, and Obj C.
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https://learnappmaking.com/add-1-creating-a-simple-ios-game-with-swift-in-xcode-week-3

Unfortunately there is a need to be inside your Xcode to draw reference links between the pages, you can find instructions at the link above with full explanations of what you need to do. (Including where to put it in your existing code) Please let me know if you need anything further!

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Customer reply replied 1 year ago
You did not answer my question. Ive already made reference links in the file provided. I am trying to transfer data from one viewcontroller to another(view2). And have that update occur on a loop.
Programmer: Chris Baxter, Programming Tutor replied 1 year ago

Is viewcontroller1 a parent (container) of view2?

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Customer reply replied 1 year ago
There are two viewcontrollers. Mainviewcontroller and view2
Customer reply replied 1 year ago
Not sure what you mean by parent controller
Customer reply replied 1 year ago
I believe the data needs to be transferred via a protocol function and delegate. I need this to happen via a loop...not sure how to write this code
Programmer: Chris Baxter, Programming Tutor replied 1 year ago

The timer cannot be stopped outside of the scope in which it is declared. However, you can send a message ( a notification) from another view controller back to the timer view controller to achieve the result you are looking for. You must send this notification from the controller with the timer declared in it, and it is from this view controller you will send a notification to stop(and start) the timer.

NSNotificationCenter.defaultCenter().postNotificationName("StopTimerNotification", object: nil)

However, you also have to tell the view controller where the timer is declared to listen for this type of notification which we named StopTimerNotification and what to do when it receives it. Note: Put this in your viewDidLoad method.

NSNotificationCenter.defaultCenter().addObserver(self, selector: "StopTimerNoticationFunction:", name:"StopTimerNotification", object: nil)

Finally, you need to implement the code to stop the timer. In this example, we have named this callback StopTimerNotificationFunction. So. put this in your file where you have declared the timer.

func StopTimerNotication(notification: NSNotification){ //Put stop timer code here. } <<or start timer code

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Programmer: Chris Baxter, Programming Tutor replied 1 year ago

A loop is a loop, for timers they are relatively simple

while so and so is not equal to whatever end-point, increment.

@IBAction func start(sender: AnyObject) {

let aSelector : Selector = “updateTime”

timer = NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, selector: aSelector, userInfo: nil, repeats: true)

startTime = NSDate.timeIntervalSinceReferenceDate()

}

"scheduledTimerWithTimeInterval" is your loop.

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Programmer: Chris Baxter, Programming Tutor replied 1 year ago

So instead of @buttonaction start, and selector named "update time" you simply want:

timer = NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, userInfo: nil, repeats: true)

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Programmer: Chris Baxter, Programming Tutor replied 1 year ago

0.01 is the duration in milliseconds, of firing on that method, there is no "data" to transfer short of the "did it fire, yes, no" message

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Customer reply replied 1 year ago
You still did not answer my question. The loop that I am referring to will constantly update the label field. The transfer of the data from the first view controller needs to happen on a loop. That code I have now just transfers it once when the action button is pressed. I am not concerned with starting or stopping the timer. I know how to do that
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Chris Baxter
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Category: Programming
Satisfied Customers: 250
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Experience: Completed BSIT concentration Software Engineering, tutored other students and classmates in Java and VB.net, C++, and Obj C.

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