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This is seriously weird. What s going on We know that C uses square brackets to refer to array elements, but we re don t seem to be doing anything with arrays here. In Objective-C, square brackets have an additional meaning: they re used to tell an object what to do. Inside the square brackets, the first item is an object, and the rest is an action that you want the object to perform. In this case, we re telling an object named shape to perform the action draw. If shape is a circle, a circle is drawn. If shape is a rectangle, we ll get a rectangle. In Objective-C, telling an object to do an action is called sending a message (although some folks also say calling a method ). The code [shape draw] sends the message draw to the object shape. One way to pronounce [shape draw] is send draw to shape. How the shape actually does the drawing is up to the shape s implementation. When you send a message to an object, how does the necessary code get called This happens with the assistance of behind-the-scenes helpers called classes. Take a look at Figure 3-3 please. The left side of the figure shows that this is the circle object at index zero of the shapes array, last seen in Figure 3-2. The object has a pointer to its class. The class is a structure that tells how to be an object of its kind. In Figure 3-3, the Circle class has a pointer to code for drawing circles, for calculating the area of circles, and other stuff required in order to be a good Circle citizen.

10:

0, 0, 10, 30 Red (Circle)

you learn how to use tables You learn how to build a table, change its style to grouped, add an index to it, and accessorize it You also learn how to place a table in a navigation controller and how to edit a table s rows It is a long chapter, but the table view is a powerful control

Section 1: Calculation of Cash Flow Net Income Before Taxes Income Taxes Net Income After Taxes Depreciation Expense Capital Expenditures Increase in Net Working Capital Cash Flow Adjustments Connie s Actual Comp Bobby s Actual Salary Connie s Arm s Length Salary Bobby s Arm s Length Salary Total Adjustments Less Tax Effects of Adjustments Adjustments, After Tax Cash Flow (B11 B19) CF/Net Inc (B20/B27)

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- (void) draw { draw a circle in the bounds filled with fillColor } // draw - (float) area { calculate the area of the circle } // area

The UITableView class represents a table view This class is for displaying and editing information lists It consists of a single column of multiple rows Users can scroll vertically to navigate through a table s rows Each row contains a cell You can customize that cell s appearance considerably You can index tables and create tables with zero or more sections When you create a table, you have a choice of two styles: UITableViewStylePlain or UITableViewStyleGrouped A plain table style presents a table like that in Figure 10-3 A grouped table presents a table like that in Figure 10-4 You see examples implementing both styles later in this chapter UITableView classes have an associated UITableViewController, a UITableViewDelegate, and a UITableViewDataSource The UITableViewController is the controller class for a table view You create an instance of this class to manage the UITableView The UITableViewDelegate is a protocol you adopt in a custom class you write This protocol allows you to manage selections, configure headers and footers, and manage cells The UITableViewDataSource is also a protocol you adopt in a custom class This protocol allows you to manage a table s data source

The UITableViewDelegate and UITableViewDataSource are protocols at least one class in your application must adopt if your application contains a UITableView You can create your own custom classes to adopt these protocols, or create a UITableViewController that automatically adopts these protocols If you choose to use a UITableViewController rather than custom classes, you simply connect the table view s dataSource and delegate outlets to the UITableViewController You can then implement both protocols methods in the UITableViewController

- (BOOL) hitTestWithPoint: (Point) point { see if point is inside the circle } // hitTestWithPoint:

1,000,000) (400,000) 600,000) 75,000) (125,000) (50,000) 500,000)

A UITableView s delegate adopts the UITableViewDelegate protocol This protocol manages selections, headers, footers, and other tasks Table 10-1 lists the methods covered in this chapter

What s the point of having class objects Wouldn t it be simpler just to have each object point directly to its code Indeed, it would be simpler, and some OOP systems do just that. But having class objects is a great advantage: if you change the class at runtime, all objects of that class automatically pick up the changes (we ll discuss this more in later chapters). Figure 3-4 shows how the draw message ends up calling the right function for the circle object.

A UITable s data source adopts the UITableViewDataSource protocol A table s data source provides the table with its data Table 10-2 lists the UITableViewDataSource protocol methods covered in this chapter

$500,000)

0, 0, 10, 30 Red (Circle)

tableView:heightForRowAtIndexPath: tableView:accessoryButtonTappedForRowWithIndexPath: tableView:willSelectRowAtIndexPath: tableView:didSelectRowAtIndexPath: tableView:editingStyleForRowAtIndexPath:

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