ios - 格式化 NSTimeInterval

Question

// calculate elapsed time
NSTimeInterval elapsed = currentTime - startTime;

int mins = (int) (elapsed / 60.0);
elapsed -= mins * 60;
int secs = (int) (elapsed);
elapsed -= secs;
int fraction = elapsed * 10.0;

// update time label using format 0:00:0
returnTimeString = [NSString stringWithFormat:@"%u:%02u.%u",mins,secs,fraction];

当前输出 0:00.0

我如何输出 00:00.00 并使其每百分之一秒而不是十分之一秒递增？

Answer 1

returnTimeString = [NSString stringWithFormat:@"%02u:%05.2f",
    (int)(elapsed/60), fmod(elapsed, 60)];