There’s a far more convenient way to trace with log messages in Xcode, and that’s using Breakpoint Actions. On the line of code where you’d be tempted to add a printf or NSLog, set a breakpoint, then control-click it and choose “Edit Breakpoint”. In the blue bubble that appears, click the + button on the … Read more
This should do the trick: #ifdef DEBUG # define NSLog(…) NSLog(__VA_ARGS__) #else # define NSLog(…) (void)0 #endif
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
You can convert an NSString into a UTF8 string by calling the UTF8String method: printf(“%s”, [string UTF8String]);
It could be that you added the property “OS_ACTIVITY_MODE”: “disable” in the Scheme environment variables (to hide OS output from the simulator) and forgot about it, and now are running on a real device. In Xcode 8: Product -> Scheme -> Edit Scheme -> Run -> Arguments -> Environment Variables Only add OS_ACTIVITY_MODE and check … Read more
Actually, the real easiest way to log a CGPoint is: NSLog(@”%@”, NSStringFromCGPoint(point)); The desktop Cocoa equivalent is NSStringFromPoint().
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
To print address use %p format specifier and self pointer: -(NSString *) description { return [NSString stringWithFormat:@”<SomeClass: %p>\nparmeterOne: %@\nparameterTwo: %@”, self, self.parameterOne, self.paramterTwo]; }
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
Updated answer: You can make use of the z and t modifiers to handle NSInteger and NSUInteger without warnings, on all architectures. You want to use %zd for signed, %tu for unsigned, and %tx for hex. This information comes courtesy of Greg Parker. Original answer: The official recommended approach is to use %ld as your … Read more