IOS NSTimeInterval use case details

ios get time interval

-(NSString *)getCurrentTime

{

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

    [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    NSString *dateTime = [formatter stringFromDate:[NSDate date]];

     = dateTime;

    return startTime;

}

date1 represents the start time. Call [self getCurrentTime]; in the end method:

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *date1 = [formatter dateFromString:startTime];

NSDate *date2 = [NSDate date];

NSTimeInterval aTimer = [date2 timeIntervalSinceDate:date1];

 

int hour = (int)(aTimer/3600);

int minute = (int)(aTimer - hour*3600)/60;

int second = aTimer - hour*3600 - minute*60;

NSString *dural = [NSString stringWithFormat:@"%d hour %d minute %d seconds", hour, minute,second];

Two I want to convert it into minutes and seconds.

For example I have: "326.4" seconds, and I want to convert it to the following string: "5:26". What is the best way to achieve this?

1. Pseudocode:

minutes = floor(326.4/60)
seconds = round(326.4 - minutes * 60)

2. Brief description The answer from Brian Ramsey is more convenient if you just want to convert to minutes. If you want Cocoa API to do it for you and convert you not only minutes, but also to the days, months, weeks, etc... I think this is a more general way to use

(NSUInteger *)components:(NSUInteger)unitFlags fromDate:(NSDate *)startingDate toDate:(NSDate *)resultDate options:(NSUInteger)opts "Return, as the date provided as the difference between the two NSDateComponents". Create 2 NSDate from API, the difference is that you want to convert. (If you don't need to do this step with your 2 NSDate, you don't even need to get your quotes from NSDateComponents sample code

// The time interval 
NSTimeInterval theTimeInterval = 326.4;
// Get the system calendar
NSCalendar *sysCalendar = [NSCalendar currentCalendar];
// Create the NSDates
NSDate *date1 = [[NSDate alloc] init];
NSDate *date2 = [[NSDate alloc] initWithTimeInterval:theTimeInterval sinceDate:date1]; 
// Get conversion to months, days, hours, minutes
unsigned int unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit;
NSDateComponents *conversionInfo = [sysCalendar components:unitFlags fromDate:date1 toDate:date2 options:0];
NSLog(@"Conversion: %dmin %dhours %ddays %dmoths",[conversionInfo minute], [conversionInfo hour], [conversionInfo day], [conversionInfo month]);
[date1 release];
[date2 release];

Known questions Too many are just a transformation, you are right, but this is how the API works. My advice: If you are going to manage your NSDate and NSCalendar, the API will do the hard work for you.

3., as a stack virgin...I don't know how to answer Brian Ramsey's answer... Using circles won't work for the second value between 59.5 and 59.99999. The second value will be 60 during this period. Use TRUNC instead of...

double progress;
int minutes = floor(progress/60);
int seconds = trunc(progress - minutes * 60);

4. Brian Ramsey's code, go to pseudofidated:

- (NSString*)formattedStringForDuration:(NSTimeInterval)duration
{
 NSInteger minutes = floor(duration/60);
 NSInteger seconds = round(duration - minutes * 60);
 return [NSString stringWithFormat:@"%d:%02d", minutes, seconds];
}

5. All this looks more than they need！ Here is a brief and intimate way to convert the time intervals to hours, minutes and seconds:

NSTimeInterval timeInterval = 326.4;
long seconds = lroundf(timeInterval); // Modulo (%) operator below needs int or long
int hour = seconds / 3600
int mins = (seconds % 3600) / 60;
int secs = seconds % 60;

Note that when you convert a floating point number to an integer you get the floor() autocomplete, but you can, if it is to make you feel better :-) It is added to the first two

6. Because it is essentially a double... 60.0 divided and extracted components and decimal parts. The component of the , will be an integer of minutes. Multiply by the decimal part and press 60.0. The result will be the remaining seconds.

This is the end of this article about the detailed explanation of the use cases of IOS NSTimeInterval. For more related content on using IOS NSTimeInterval, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!