Debugging using printf() in Xcode Console

You can use printf() function inside .m file to indicate the app status such as application starts and ends.

In Xcode, select AppDelegate.m file, insert a line inside applicationDidFinishLaunching: method:

- (void)applicationDidFinishLaunching:(UIApplication *)application {
…
}

Add the following:
printf(“%s\n”, __FUNCTION__);

Note: The __Function__ has two underscores before and after the FUNCTION.

Add the same line to applicationWillTerminate: method

- (void)applicationWillTerminate:(UIApplication *)application {
…
}

You should be able to see the printed output inside Xcode Console when you launch the app

[AppDelegate applicationDidFinishLaunching:]

After you exit the app by pressing the Home button on the iPhone simulator, you will see this printed output
[AppDelegate applicationWillTerminate:]

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