XCode debug vs release build when debugging

First, the configurations “Debug” and “Release” are just names, you could also name them “Jon” and “Carla” if you want. They are just names for a configuration sets that you can modify and you can tweak them so that for example the “Debug” configuration is not suitable for debugging any more. So if you (accidentially) … Read more

How update a label periodically on iOS (every second)? [duplicate]

The problem is that a scheduledTimer will not get called while the main thread is tracking touches. You need to schedule the timer in the main run loop. So instead of doing [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(updateLabel:) userInfo:nil repeats:YES]; use NSTimer* timer = [NSTimer timerWithTimeInterval:1.0f target:self selector:@selector(updateLabel:) userInfo:nil repeats:YES]; [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];

iOS sandbox environment auto-renewal subscription

a) Auto-renewing subscriptions are inconsistent in the sandbox environment. Sometimes a subscription will renew multiple times (about 5) before ending. Other times it won’t renew at all. b) (iOS6 transaction receipts only) You don’t need to call restoreCompletedTransactions to check the status of a subscription if you’re storing previous receipts (preferably on your server). Just … Read more

iPhone crashing when presenting modal view controller

I have modified it slightly so that the loading view is shown after a tiny delay, and this works fine! So it appears to be something within the same event loop! – (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; // Show load [self performSelector:@selector(doit) withObject:nil afterDelay:0.1]; } – (void)doit { [self presentModalViewController:loader animated:YES]; }

CLLocation Category for Calculating Bearing w/ Haversine function

Your code seems fine to me. Nothing wrong with the calculous. You don’t specify how far off your results are, but you might try tweaking your radian/degrees converters to this: double DegreesToRadians(double degrees) {return degrees * M_PI / 180.0;}; double RadiansToDegrees(double radians) {return radians * 180.0/M_PI;}; If you are getting negative bearings, add 2*M_PI to … Read more