Decrease load times?

[appchamp4]

Hi I have an app where one of the features on the main page is a countdown to a certain date.

This is my code in my viewdidload:

destinationDate = [[NSDate dateWithTimeIntervalSince1970:1358303211] retain];
    timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateLabel:) userInfo:nil repeats:YES];

and my updatelabel method:

-(void)updateLabel:(NSTimer *)timer {
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    int units = NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit;
    NSDateComponents *components = [calendar components:units fromDate:[NSDate date] toDate:destinationDate options:0];
    daysLabel.text = [NSString stringWithFormat:@"%d", [components day]];
    hoursLabel.text = [NSString stringWithFormat:@"%d", [components hour]];
    minutesLabel.text = [NSString stringWithFormat:@"%d", [components minute]];
}

This works great except it takes a little long to show up upon app launch. Is there anyway to reduce the time it takes to execute this?

Thanks

[Duncan C]

Originally Posted by appchamp4

Hi I have an app where one of the features on the main page is a countdown to a certain date.

This is my code in my viewdidload:

destinationDate = [[NSDate dateWithTimeIntervalSince1970:1358303211] retain];
    timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateLabel:) userInfo:nil repeats:YES];

and my updatelabel method:

-(void)updateLabel:(NSTimer *)timer {
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    int units = NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit;
    NSDateComponents *components = [calendar components:units fromDate:[NSDate date] toDate:destinationDate options:0];
    daysLabel.text = [NSString stringWithFormat:@"%d", [components day]];
    hoursLabel.text = [NSString stringWithFormat:@"%d", [components hour]];
    minutesLabel.text = [NSString stringWithFormat:@"%d", [components minute]];
}

This works great except it takes a little long to show up upon app launch. Is there anyway to reduce the time it takes to execute this?

Thanks

The time is being taken in the code you didn't show. (loading nibfiles, running your appDidFinishLoading, etc.)

You should learn to use the time profiler instrument in Instruments. It will let you figure out where the time is being spent at startup. Once you know what's taking a long time, you can figure out how to reduce that time.

BTW the code you posted leaks the calendar object. Since you are using a clalendar over and over, why not create one in your init method and save it in a retained property, then use the existing calendar?

[appchamp4]

Originally Posted by Duncan C

The time is being taken in the code you didn't show. (loading nibfiles, running your appDidFinishLoading, etc.)

You should learn to use the time profiler instrument in Instruments. It will let you figure out where the time is being spent at startup. Once you know what's taking a long time, you can figure out how to reduce that time.

BTW the code you posted leaks the calendar object. Since you are using a clalendar over and over, why not create one in your init method and save it in a retained property, then use the existing calendar?

great thanks, that was actually really helpful

[Bopols]

are you testing the load time in the device and not the simulator?