The quotes appear because the string contains something besides basic alphanumerics — in this case, an underscore. It’s the same reason “tbyg.jpg” and “6bcb4126-4bbe-4b3d-be45-9a06cf56a22f” have quotes (they contain a dot and dashes, respectively). That’s just how the description method works. It wouldn’t cause your second log to fail.
The first number is the process ID, the second is the logging thread’s Mach port. A desktop example: 2010-10-19 17:37:13.189 nc_init[28617:a0f] nc <CFNotificationCenter 0x10010d170 [0x7fff70d96f20]> – default <CFNotificationCenter 0x10010d2a0 [0x7fff70d96f20]> (gdb) i thread Thread 1 has current state “WAITING” Mach port #0xa0f (gdb port #0x4203) frame 0: main () at nc_init.m:10 pthread ID: 0x7fff70ebfc20 system-wide … Read more
Actually, above answers are not quite right. I followed them and got zeros again and again. The trick is to place your frame-dependent code to the viewDidLayoutSubviews method, which Notifies the view controller that its view just laid out its subviews. Do not forget that this method is called multiple times and is not the … Read more
Xcode is complaining because this is a security problem. Here’s code similar to yours: NSString *nameFormat = @”%@ %@”; NSString *firstName = @”Jon”; NSString *lastName = @”Hess %@”; NSString *name = [NSString stringWithFormat:nameFormat, firstName, lastName]; NSLog(name); That last NSLog statement is going to be executing the equivalent of this: NSLog(@”Jon Hess %@”); That’s going to … Read more
One way to do it is to go into your Build settings and under the Debug configuration add a value to “Preprocessor Macros” value like: DEBUG_MODE=1 Make sure you only do this for the Debug configuration and not for Beta or Release versions. Then in a common header file you can do something like: #ifdef … Read more
Preprocessor macros are indeed great for debugging. There’s nothing wrong with NSLog(), but it’s simple to define your own logging function with better functionality. Here’s the one I use, it includes the file name and line number to make it easier to track down log statements. #define DEBUG_MODE #ifdef DEBUG_MODE #define DebugLog( s, … ) … Read more
Here are some useful macros around NSLog I use a lot: #ifdef DEBUG # define DLog(fmt, …) NSLog((@”%s [Line %d] ” fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__) #else # define DLog(…) #endif // ALog always displays output regardless of the DEBUG setting #define ALog(fmt, …) NSLog((@”%s [Line %d] ” fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__) The DLog macro is … Read more