Find difference in seconds between NSDates as integer using Swift -

I am writing a piece of code, where I want the time for how long a button has been caught. To do this, I entered a NSDate () when the button was pressed, and tried to use the timeIntervalSinceDate function when the button was issued. It seems to work, but I can not find any way to print results or switch to an integer.

time = Println ("release") var elapsedTime = NSDate.timeIntervalSinceDate (timeAtPress) period = ??? }

I have seen some similar questions, but I do not know why, so it was a difficult time to understand the answers given to me. I am open to suggestions if it takes time to catch button. thank you in advanced. Your attempt to compute elapsedTime is wrong.

  spent = date (). Time ServerSign (TimeTime)  

Note () Date After reference Date () A new date object , And then returns the difference between TimeIntercins at that time and timechanges . It will return a Floating Point value (technically, a TimeInterval ).

If you want to shorten a int value, then you can use it:

And, BTW, your time-to-press does not require the definition of a variable to modify an date It seems that you intend:

  var timings start: date!  

This defines the variable as the date variable (an undisclosed form), but you can possibly postpone the actual acceleration of that code. Unless that can not be pressed is called.

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Alternatively, I often use, like,

  start: CFAbsoluteTime!  

And when I want to set up startTime , I do the following:

  start = CFAbsoluteTimeGetCurrent () < / Code> 

And when I want to calculate the number of seconds remaining, I do the following:

  expired = CFAbsoluteTimeGetCurrent () -   Start 
 
 It is worth noting that the documentation warns us:  
 
 Increasingly called nonantonic calls to this function W No guarantee Inamon. System time can be reduced due to synchronization or explicit user change of the clock with external time references.   
 This means that if you are unfortunate, these adjustments occur, you can end up with the wrong calculation time. This is also true for  NSDate  /  date  calculations. The best way to use based on  mach_absolute_time  based calculation (most easily done): 
 
  start = cacrrt media time ()  < / Pre> 
 and 
 
  passed = cacrrmm mediatime () -  
 
 launches  mach_absolute_time  , But avoids some of the complications mentioned herein. / P> 
 Remember, however, when the device is rebooted,  CACurrentMediaTime  /  will be reset to mach_absolute_time . Therefore, the bottom line, if you are running an app, then calculate the precise last time, then use  CACurrentMediaTime  but if you are going to save this initial time in constant storage, Which you may recall, after restarting the app in some future date, you will have to use the  date  or  CFAbsoluteTimeGetCurrent , and just be with any impurity Which can be.