Which of the following classes is used to find and monitor the available capture devices on a system (iphone/ipad)?

Which Messages framework classes is used to create and update messages?

Which of the following classes defines an object, which specifies if the widget has content to display?

Grand Central Dispatch (GCD) provides functions to access several common dispatch queues in an application. Which of the following functions, when called from inside a block object, returns the queue, to which the block was originally submitted for queuing?

Correct sequence of steps for creating an object that supports background downloading? 1: Create the conf‌iguration object using the backgroundSessionConf‌igurationWithldentifier method of NSURLSessionConf‌iguration. 2: Set the discretionary property of the configuration object to YES, in case the app starts the transfer while in foreground. 3: Set the value of the conf‌iguration object's sessionSendsLaunchEvents property to YES. 4: Use the conf‌iguration object to create your NSURLSession object.

Which function is used to provide the largest data packet, which the operating system guarantees, can be sent without fragmentation?

What is the use of 'Disabled' attribute of a Text Field object?

Which is the correct declaration of an input text field with the title, 'input2'?

Which attribute in Xcode 4.x, enables you to display 'Comment' as a text inside a text field, as given in the image?

Suppose you are creating an ad hoc provisioning profile in Xcode 4.x. Which of the following will you seek from your testers/testing team to add to the iOS Provisioning Portal?

Which can help you to add a new framework to your iOS app in Xcode 4.x?