Interface Builder and Storyboards
As much as writing code is important in developing applications, getting a little help in the form of visual aids is nice. It is not difficult for a seasoned developer to whip up a user interface (UI) from code in a couple of minutes, but there could be other design considerations that might be an impeding factor when drawing UIs via code. For visual editing, Apple provides Interface Builder as an integral part of Xcode. It works quite well with the code editor too, whereby you can drag and drop to create outlets and actions.