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I have an Xcode project I've been working on for months. I've never had a problem with NSLog, but after upgrading to Xcode 4.2 nothing will log to the console. I even tried throwing this in viewDidLoad:
- (void)viewDidLoad { [super viewDidLoad]; NSLog(@"Can anyone hear me?"); And nothing. Is anyone else having this problem or know a solution?
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NSLog outputs messages to the Apple System Log facility or to the Console app (usually prefixed with the time and the process id).
NSLog() output on the simulator does indeed show up in the Console Mac OS X application. Go to All Messages and then filter based on your app name to get rid of the fluff, and run again. You'll see it in your output if the NSLog code is actually being hit during the execution of your program.
There is no format specifier to print boolean type using NSLog. One way to print boolean value is to convert it to a string. Another way to print boolean value is to cast it to integer, achieving a binary output (1=yes, 0=no).
Press ⇧⌘Y or choose View > Debug Area > Show Debug Area to show the console output (or ⇧⌘C / Activate Console). Usually, this window will open automatically when your program produces output (this is controlled by the Behaviors section of Xcode's Preferences).
Well, this is embarrassing. The console got deactivated somehow and I was actually watching the variables window. Pressing Shift + + C did the trick.
Many thanks to Robert King on this thread:
https://devforums.apple.com/message/565880#565880
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