Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "When you do a new, malloc, or alloc, what the operating system does is that it is giving your program a chunk of memory on the heap."

A block of code is set as follows:

int main(int argc, char *argv[]) {

  SomeObject *myOwnObject;
  // myOwnObject is created in main
   myOwnObject = [[SomeObject alloc] init];

    // myOwnObject can be used by other objects
  [anotherObject using:myOwnObject];

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "In Xcode, go to the target Build Phases tab, open the Compile Sources group, and you will be able to see the source file list."