Seconds to - Minutes - Hours - Milliseconds

问题

I'm using the NSTimer, with this code:

- (IBAction)start:(id)sender {

    MainInt = 0;

    timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(countup) userInfo:nil repeats:YES];

}

How can I display milliseconds and minutes also?

Didn't find any simple yet working method.

回答1:

For milliseconds use:

timer = [NSTimer scheduledTimerWithTimeInterval:0.001 target:self selector:@selector(countup)userInfo:nil repeats:YES];

For minutes use:

timer = [NSTimer scheduledTimerWithTimeInterval:60.0 target:self selector:@selector(countup)userInfo:nil repeats:YES];

回答2:

Make a shorter interval, like 0.1f timer = [NSTimer scheduledTimerWithTimeInterval:0.1f target:self selector:@selector(countup)userInfo:nil repeats:YES]; and use NSDateFormatter to display the counter. An example for the NSDateFormatter can be found here: timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(countup)userInfo:nil repeats:YES];

How the NSDateFormatter works is explained very well here: How to handle different date time formats using NSDateFormatter

Your timer should update a float variable where it stores the milliseconds.

Sample:

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"mm:ss:SSS"];
    NSTimeInterval interval = [startDate timeIntervalSinceNow]*-1;
    NSString *clock = [formatter stringFromDate:[NSDate dateWithTimeInterval:interval sinceDate:startDate]];

But you should go Roy Sharon answer.

来源：https://stackoverflow.com/questions/12026939/seconds-to-minutes-hours-milliseconds

标签

ios

nstimer