NSTime create a timeInterval

2019-06-11 03:35发布

I have the following code in my application in the method updateLabel2:

timeLeft = [[NSDate date] timeIntervalSinceDate:[[NSUserDefaults standardUserDefaults] objectForKey:@"lastDate"]];

[[self timer] setText:[NSString stringWithFormat:@"Time Remaining: %f", timeLeft]]; //Set the label text

Note that timer is a label.

and earlier, the following code is executed:

    [[NSUserDefaults standardUserDefaults] setObject:[NSDate date] forKey:@"lastDate"];


self.repeatTimer = [NSTimer scheduledTimerWithTimeInterval:1
                                               target:self
                                             selector:@selector(updateLabel2) 
                                             userInfo:nil
                                              repeats:YES];

My problem is that timeLeft is being set to random integers which are definetly not what the timeIntervals should be, and are not within one second of each other either.

1条回答
手持菜刀,她持情操
2楼-- · 2019-06-11 04:05

Your format-string is wrong:
Because NSTimeInterval is a floating point type, you need to either

  • use the appropriate placeholder %f instead of %d or
  • cast timeLeft to an int while calling -[NSString stringWithFormat:].

Which — I think — is, what Justin referred to.

Aside

Considering what you're doing there:
Shouldn't that be "Time elapsed"?

查看更多
登录 后发表回答