While using an iPhone, a user switches from one application to another application or service on the device. What is the most important factor to be kept in mind to ensure that your application reflects the most recent changes made by the user the next time it starts?

How do you play a short sound on the iPhone?

Which is not a touch event method?

Is OpenAL available on the iPhone?

Consider the following code: (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Set Background Color/Pattern self.window.backgroundColor = [UIColor blackColor]; self.tabBarController.tabBar.backgroundColor = [UIColor clearColor]; //self.window.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@'testbg.png']]; // Set StatusBar Color [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackTranslucent]; // Add the tab bar controller's current view as a subview of the window self.window.rootViewController = self.tabBarController; [self.window makeKeyAndVisible]; return YES; } How can the error be corrected that gets thrown in the console, 'Applications are expected to have a root view controller at the end of application launch'?

Which allows it to determine if an application is running on iPhone, or if it's running on an iPod Touch?

Which Audio Toolbox framework file defines an interface for reading and writing audio data in files in iPhone OS 4.0?

What is the functionality of the beta parameter of function catlas_caxpby in class cblas?

The genstrings tool can parse _____.

What is the data type of extendStart parameter of function CGShadingCreateAxial of class CGShading?

What will you get from the default database? NSUserDefaults *defs = [NSUserDefaults standardUserDefaults]; NSArray *languages = [defs objectForKey:@'AppleLanguages']; NSString *preferredLang = [languages objectAtIndex:0];