NSTimer Pause not working

Question

I have setup three buttons with start,stop,pause. and given controls to NSTimer to calculates.start stop button works fine gives me the start and stop time but pausebutton does not gives me accurate time .it actually pause time ..but start again it adds the paused timed and disp[ay. supoose i pause at 5 second of start and wait for 5 sec then press start...it should display 5 ...but displaying 10..

-(void)start:(NSTimer *)timer
{
  if(_timer==nil)
  {
    startDate =[NSDate date];

    _timer=[NSTimer scheduledTimerWithTimeInterval:0.25 target:self selector:@selector(timer:) userInfo:nil repeats:YES];
  }

  if(_timer!=nil)
  { 
    float pauseTime = -1*[pauseStart timeIntervalSinceNow];

    [_timer setFireDate:[previousFireDate initWithTimeInterval:pauseTime sinceDate:previousFireDate]];
  }

}

-(void)timer:(NSTimer *)timer
{
  NSInteger secondsSinceStart = (NSInteger)[[NSDate date] timeIntervalSinceDate:startDate];

  NSInteger seconds = secondsSinceStart % 60;
  NSInteger minutes = (secondsSinceStart / 60) % 60;
  NSInteger hours = secondsSinceStart / (60 * 60);
  NSString *result = nil;
  if (hours > 0) 
  {
    result = [NSString stringWithFormat:@"%02d:%02d:%02d", hours, minutes, seconds];
  }
  else 
  {
    result = [NSString stringWithFormat:@"%02d:%02d", minutes, seconds];        
  }

  label.text=result;

  NSLog(@"time interval -> %@",result);
}

-(void)stop
{
  if(_timer!=nil)
  {
    endDate = [NSDate date];
 NSLog(@"endate%@",endDate);

     NSTimeInterval interval = [endDate timeIntervalSinceDate:startDate];
NSLog(@"total time %f",interval);
    [_timer invalidate];
    _timer = nil; 
  startDate=nil;
  }
}

-(void)pause:(NSTimer *)timer
{
  pauseStart = [NSDate dateWithTimeIntervalSinceNow:0];

  previousFireDate = [_timer fireDate];

  [_timer setFireDate:[NSDate distantFuture]];
}

I don't know if I'm right, but may be you should invalidate the timer before doing a "setFireDate" ? — Ashbay, Dec 31 '12 at 12:57
When you pause the timer. store the sec. And only increment once it is started. — Anoop Vaidya, Dec 31 '12 at 13:01
@AnoopVaidya what I did ,by putting `NSTimeInterval interval = [endDate timeIntervalSinceDate: pauseStart]; NSLog(@"total time %f",interval);` in (void) pause I calculated the paused time...now how do I increment to the current time — Christien, Dec 31 '12 at 13:38

score 1 · Answer 1 · answered Dec 31 '12 at 13:04

1

It will never ever work for you because NSTimer cant be pause, it will Start and It will only Stop when you will invalidate it. when it will in valid state it means it is running and when the state is not valid it means Timer is stopped. Thanks

answered Dec 31 '12 at 13:04

junaidsidhu

3,539
1
27
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then how can i give Pause button – Christien Dec 31 '12 at 13:08
you have write you own custom class for this, that class with handle these two method, like resume, pause. – junaidsidhu Dec 31 '12 at 13:12

Anoop Vaidya · Accepted Answer · 2013-01-01T17:09:45.033

I have created this applicaion on mac os. I think you can understand the logic and even copy this with minor changes...as for UILabel.

In .h

@interface AppDelegate : NSObject <NSApplicationDelegate>

@property (assign) IBOutlet NSWindow *window;

- (IBAction)start:(id)sender;
- (IBAction)pause:(id)sender;
- (IBAction)stop:(id)sender;
@property (strong) IBOutlet NSTextField *label;

@property (strong)NSDate *startDate;
@property (strong)NSTimer *timer;

@property (assign)BOOL isRunning;
@property (assign)BOOL isPaused;

@property(assign)NSInteger secondsSinceStart;

@property(assign)NSInteger secondsPaused;
@end

In .m

#import "AppDelegate.h"

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    self.label.stringValue=@"00:00:00";
    self.isRunning=NO;
    self.isPaused=NO;
    self.secondsPaused=0;
}

-(void)timerDisplay{

    if (self.isPaused) {
        self.secondsPaused++;
        return;
    }

    self.secondsSinceStart+=1;

    NSInteger seconds = self.secondsSinceStart % 60;
    NSInteger minutes = (self.secondsSinceStart / 60) % 60;
    NSInteger hours = self.secondsSinceStart / (60 * 60);
    NSString *result = nil;


    if (self.isRunning && !self.isPaused) {
        result = [NSString stringWithFormat:@"%02ld:%02ld:%02ld", hours, minutes, seconds];
        self.label.stringValue=result;
    }
}


- (IBAction)start:(id)sender {
    self.isRunning=!self.isRunning;
    self.isPaused=NO;
    self.secondsSinceStart=0;
    self.label.stringValue=@"00:00:00";


    self.startDate =[NSDate date];
    if (!self.timer) {
        self.timer=[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerDisplay) userInfo:nil repeats:YES];
    }
}

- (IBAction)pause:(id)sender {
    self.isPaused=!self.isPaused;
    NSLog(@"pause : %d",self.isPaused);
}

- (IBAction)stop:(id)sender {
    self.isRunning=NO;
    NSLog(@"start : %@",self.startDate);
    NSLog(@"end : %@",[NSDate date]);
    NSLog(@"paused : %ld",self.secondsPaused);

    NSInteger totalTime=self.secondsSinceStart+self.secondsPaused;

    NSInteger seconds = totalTime % 60;
    NSInteger minutes = (totalTime / 60) % 60;
    NSInteger hours = totalTime / (60 * 60);
    NSString *result = result = [NSString stringWithFormat:@"%02ld:%02ld:%02ld", hours, minutes, seconds];
    NSLog(@"Total : %@",result);

}
@end

ya sorry bro,I check this late...This works fine but only thing this left to calculate time from start to stop ... I am doing..this in stop function.`Stop = [NSDate date]; NSTimeInterval interval = [Stop timeIntervalSinceDate:startDate];`...but this does not give me the exact time.. — Christien, Jan 01 '13 at 12:18
create another NSDate and endDate. And as you press Stop... store the endDate=[nsdate date], and then calculate the differnce between startDate & endDate. And remember this will count the paused time. If you want to discard the paused time, then subtract the seconds from there... — Anoop Vaidya, Jan 01 '13 at 12:23
thats wat i did..but how to subtract the pause time..how to store this ..I am unable to store — Christien, Jan 01 '13 at 15:59
dont worry dude... will update the answer with this feature tomorw... fir bhi try karta hu teamviewr se office mac ko access karne ka. — Anoop Vaidya, Jan 01 '13 at 16:11

NSTimer Pause not working

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