NSThread里的RunLoop停止

[NSThreaddetachNewThreadSelector:@selector(display) toTarget:selfwithObject:nil];

- (void)display
{
   self.timer = [NSTimer scheduledTimerWithTimeInterval:0.04 target:self.circularTimer selector:@selector(run) userInfo:nil repeats:YES];
    while (_subThreadIsAllow) {
        [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:5.0f]];
    }
}