Download Cocoa Programming: A Quick-Start Guide for Developers by Daniel H. Steinberg PDF

By Daniel H. Steinberg

Cocoa Programming: A Quick-Start consultant for Developers indicates you ways to get efficient with Cocoa-fast! We won't stroll you thru each type and process within the API (but we are going to express you the place to discover that information). as an alternative, we'll bounce correct in and begin development an online browser utilizing Cocoa. in precisely a couple of minutes you'll have anything that works. a few minutes extra, and you'll have code on your customized controller, listening for notifications and call-backs. quickly you'll have the performance you'd count on in a whole browser. And that's simply the 1st few chapters...

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4 Finishing the Interface You still have two buttons labeled Button. One way to change a button’s label is to double-click the button and type the new name. Another way is to use the inspector and select the Attributes tab. This is the inspector’s leftmost tab—the one with the slider icon. You can also access this tab using D 1 or Tools > Attributes Inspector. Set the title for the leftmost button to Back by selecting the rectangle to the right of Title and typing Back in the data-entry field. When you select another area of the inspector, you will see the title of the button changes.

The type of sender is upcast to id. This is the generic type for Cocoa. Any pointer to an object is at least of type id. Having a handle to the sender allows us to communicate with the object that called goBack: no matter what its type. goBack(this) 4. The return type of goBack: is IBAction. We’re going to wait until Chapter 8, Creating a Controller, on page 141 to talk about what that means. For now, you can treat it as a void. 0 printing, April 2010) 54 M ETHODS WITH A RGUMENTS Let’s use a method with more arguments to help you better understand the differences.

This chapter is your introduction to messages in Objective-C and Cocoa. 5, Wiring Up the Components, on page 35, you used Interface Builder to create a connection from your Back button to the goBack: received action in your web view. 1 1. You might notice that I’ve introduced a slight simplification by dropping the : at the end of goBack. I’ll fix that in a little bit, but it’s going to make it easier for us in the beginning. S ENDING M ESSAGES W ITHOUT A RGUMENTS Let’s assume you have instantiated the two objects involved in this action.

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