pragma directive in UIViewController

When i create a UITableViewController class, the template has some #pragma directives:

#pragma mark -
#pragma mark View lifecycle

at the start and:

#pragma mark -
#pragma mark Table view data source

at the beginning of the implementation of the data source methods.

I know that #pragma is a compiler directive, but why do we need to notify the compiler of the above?

Does this mean that we have to give a #pragma directive every time we implement any kind of data source开发者_运维技巧/delegate protocols?

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You dont need to use them. They are simply for code "prettiness" and separating methods.

In my screenshot example, they are used to draw the lines you see, separating delegates.

#pragma mark - draws the line and #pragma mark My Delegates shows you whatever text you see in BOLD.

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In addition to WrightsCS's absolutely correct answer, I want to point out something else:

If you want to use pragma's on your own, just drop the first line and move the dash to the second line.

#pragma mark -
#pragma mark View Lifecycle

and

#pragma mark - View Lifecycle

produce exactly the same.