CODEWITHSUNDEEP
objective-ciosprogress-barnstimer
user1587432
user1587432

Reputation: 39

Using ProgressBar based on Time in objective-c

Hi i want use progress bar in my iPhone app based on time like if one person start journey starts at 10:00 Am and finished at 11:00 Am then for every 5 minutes i will update the progress comparing with current time, how is it possible

Upvotes: 0

Views: 4524

Answers (2)

Mert
Mert

Reputation: 6065

iVars:

NSDate *_startDate = ....
NSDate *_finishDate = ....
UIProgressBarView *_progressBar = ....

triggerMethod:

- (void)start
{
   [self updateProgressBar];
   NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:updateInterval 
                                                     target:self 
                                                     selector:@selector(updateProgressBar) 
                                                     userInfo:nil 
                                                     repeats:YES];
}

update progressbarview

- (void)updateProgressBar
{
     NSTimeInterval diff = [_finishDate timeintervalSince:_startDate];
     NSTimeInterval pastTime = [_finishDate timeIntervallSinceNow];
     [_progressBar setProgress:pastTime/diff animated:YES];

}

Do not forget to invalidate timer when it is finished and in dealloc method.

If you save your finish and start date somewhere else in your code. Then you can recreate the view with same state even it is deallocated. It means the user do not need have open that view 1 hour. eg. he/she close and open after 30 min.

Upvotes: 0

Mick MacCallum
Mick MacCallum

Reputation: 130222

You could use a simple NSTimer to achieve this:

In viewDidLoad of course, these variables will need to be declared in your header file.

UIProgressView *myProgressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
float someFloat = 0;

NSTimer *myTimer = [NSTimer scheduledTimerWithTimeInterval:300 target:self selector:@selector(methodToUpdateProgress) userInfo:nil repeats:YES];

Then this will update the progress view (assuming min/max value is 0-100)

- (void)methodToUpdateProgress
{
    if(someFloat == 100){
         [myTimer invalidate];
    }else{
         someFloat = someFloat + 12;
         [myProgressView setProgress:someFloat animated:YES];
    }
}

Additionally, if the time at which this is called is actually a concern this example should help you a lot. Quoted From: How do I use NSTimer?

NSDate *d = [NSDate dateWithTimeIntervalSinceNow: 60.0];
NSTimer *t = [[NSTimer alloc] initWithFireDate: d
                              interval: 1
                              target: self
                              selector:@selector(onTick:)
                              userInfo:nil repeats:YES];

NSRunLoop *runner = [NSRunLoop currentRunLoop];
[runner addTimer:t forMode: NSDefaultRunLoopMode];
[t release];

NOTE: This is a pretty rough example, but it should get the point across. Hope this helps!

Upvotes: 2

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