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POStop pinwheel of death in infinite loop Objective C
 

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  1. POStop pinwheel of death in infinite loop Objective C
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    <p>I am writing a simple timer program for myself in objective c for my mac. The timer counts down properly, but I get the spinning pinwheel of death. How can I make the pinwheel go away? I think its because I have an infinite loop but there must be someway to bypass it.</p> <p>I have an IBAction that triggered on a button click (the button is start). And from there, it calls another function that does the work.</p> <p>Here is my IBAction:</p> <pre><code>- (IBAction)timerStart:(id)sender { self.timerDidPause = NO; [self timerRunning]; } </code></pre> <p>And here is timerRunning:</p> <pre><code>- (void)timerRunning { for (;;) { usleep(1000000); if (self.timerDidPause == YES) { } else { if (self.seconds == 0) { if (self.minutes == 0) { [self timerDone]; break; } else { self.seconds = 59; self.minutes = self.minutes - 1; [self formatTimerLabel:self.hours :self.minutes :self.seconds]; } } else { self.seconds = self.seconds - 1; [self formatTimerLabel:self.hours :self.minutes :self.seconds]; } } } } </code></pre> <p>In this function, the function formatTimerLabel is called so here is that:</p> <pre><code>- (void)formatTimerLabel:(int)hours :(int)minutes :(int)seconds { NSString *minuteString = [[NSString alloc] init]; NSString *secondString = [[NSString alloc] init]; if (minutes &lt; 10) { minuteString = [NSString stringWithFormat:@"0%d", minutes]; } else { minuteString = [NSString stringWithFormat:@"%d", minutes]; } if (seconds &lt; 10) { secondString = [NSString stringWithFormat:@"0%d", seconds]; } else { secondString = [NSString stringWithFormat:@"%d", seconds]; } [self.timerLabel setStringValue:[NSString stringWithFormat:@"%d:%@:%@", hours, minuteString, secondString]]; [self.timerLabel display]; } </code></pre>
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    1. COWhere in this code does the `UIActivityIndicator` (the pinwheel) come in?
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    2. COIn the debugger press the PAUSE button and see where the code is executing.
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    3. COYep, you should never sleep in a UI thread.
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