Xcode 4 iOS Development Beginners Guide

Xcode 4 iOS Development Beginner's Guide

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Beginner's Guide to iOS Development: The Interface - Part I - Hongkiat

Below are the changes of objects required in Second View:. This is what you will achieve in the end, you can notice that the outcome of the Second View is almost identical to the First View.

We can start off building the backend functionality for our simpler first view. First of all you will see the following code in the FirstViewController. Now replace the code above with the code below. This is what property is creating — a new outlet for Xcode to connect into the interface.

About degreeConvert , it will take the value in our text field and perform conversions from Fahrenheit to Celsius. Now we get into the differences from. We need to implement the functionality into our FirstViewController. Save any changes and click to open the FirstViewController. We need to create a synthesis accessing elements in the First View header. This is performed with synthesize so now our actions can manipulate the different objects on-screen.

This is declared on the single text field and results label, respectively. If you are still new to Objective-C syntax then it may seem a bit funky. First we have degreeConvert which takes in no parameters and returns void.

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This is the method called when a user presses down on the convert button in first view. A variable fahren is set to pull the value from whatever the user has entered. We can then calculate another variable celsius with basic math. This code is also seen in the second function backgroundTouchedHideKeyboard. Basically it hides the keyboard and deselects the text field after the user either touches the background or hits the convert button. The rest of our degreeConvert function creates a new string NSString to store the Celsius conversion and using dot syntax adds this into our label field.

At the bottom of our FirstViewController. We should release all the different subviews from memory which include our text field and output label. This is the final step for the First View and we will connect our front-end elements with back-end code! When building iOS apps there are 3 major segments to completion: Save both your FirstViewController.

Beginner’s Guide to iOS Development: Building Your First App – Part II

Then, click back onto the storyboard and look at the Document Outline. Click on the orb to select it , and a blue outline should appear on your First View scene. Now press Ctrl and click the First View Controller — First to drag onto the text field , then release it. After the action, a list of Outlets will come up. If the connection is successful the text field will flash. Both our outlets are now connected into these variables and we just need to connect the actions.

Click on the right arrow of the First View Controller — First and you will see a component named View — click to select it.

Jump Right In

In order for the keyboard to recognize the background as a tappable object it must be converted into a control. This is how we connect a page event swipe, tap, hold, etc to a single function call.

Hello World!

Look through the list of events until you find Touch Down. Click in the small circle located at the right side of the Touch Down event , then drag and drop it onto the First View Controller. Finally click to select the Convert button and make sure it has a blue highlight , similar to the screenshot above but without selecting the whole View Control. Choose the function named degreeConvert , which will only trigger when the user touches the button and releases within the set boundaries. If everything is running smoothly you should be able to enter some values into the text field and hit convert to see the result in Celsius!

Time for action — implementing the Show Activity Indicator method. Time for action — implementing the Display Alert Dialog method. Time for action — implementing the Display Action Sheet method. Time for action — handling alerts via sounds and vibrations.

Exploring the MultiTouch Interface. Time for action — implementing the motionBegan, motionEnded, and motionCancelled methods. Time for action — creating the OrientationExample project. Time for action — creating the AccelGyroExample project. Time for action — creating the DebuggingExample project. Time for action — using the Scheme Editor to define a Scheme.

Time for action — configuring your project to perform automatic Static Analysis. Time for action — detecting an instance of an uninitialized variable. Time for action — stopping Xcode from alerting you to problems. Source Code Management with the Version Editor.

Time for action — setting up a local Subversion repository. Time for action — configuring the Subversion repository. Time for action — adding our TapExample project to the repository. Time for action — checking out the project from the repository. Time for action — creating a new Xcode project using Git. Time for action — assigning address book identities within the organizer. Making your Applications Run Smoothly.

Time for action — creating the InstrumentsExample project. Time for action — creating and deploying the app to an iOS device.

Time for action — getting the Distribution Certificate. Time for action — uploading the application icon and screenshot images. What You Will Learn Install and configure a set of frameworks to make your life easier for developing iPhone applications Download and install the Xcode 4 Development Tools Get started with Apple's Objective-C and Cocoa Touch Understand the Model-View-Controller MVC development paradigm Implement application input and views Build rotatable and resizable user interfaces Read and write data using the Core-Data framework Use the iPhone's media playback to play sounds and videos Create map and location-based services Sense motion using the Accelerometer and Gyroscope Manage source code with the Version Editor Use instruments to make your applications run smoothly Build, package and distribute your applications through the App Store.

Learning Windows 8 Game Development. Mobile Game Design Essentials. View our Cookie Policy. We understand your time is important. Uniquely amongst the major publishers, we seek to develop and publish the broadest range of learning and information products on each technology. Now you can use the Photoshop to create a pixel-perfect layout on your own, but this proves to be a very exhausting and tedious work.

This is a huge file with just too many elements. With the settings, you can click on any element and Photoshop will bring you to its corresponding layer! Depending on your app you could include a slew of features within the core area, many of which you could find in this PSD file. After the installation is completed, launch the Xcode and its welcome screen should come up. From here you can load an older project or choose to make a new one. Xcode will build the file directory and send you into a new window for working.

You should see a lot of file options listed, but the folder which is named after your application is the primary focus. With the new Xcode 4. However, as you are creating more views in a single app the amount of nib files can become far too overwhelming, so a new storyboard file holds all of your nib views in a single editor pane. From here you can remove and add UI elements and features with ease. These are short filenames for header and implementation code. These files are where you write all the Objective-C functions and variables required for your app to run.

It may be a good idea to explain how Xcode works with MVC Model, View, Controller , which is the reason that we need 2 files for each controller. But models cannot interact with the screen, only views can. Views are mostly all visuals, and it can only pull data through a ViewController. The Controller is actually a much more refined way of hiding your back end data from the front end design. In this way you can renovate the design several times over while not losing any functionality. Click on the file to select it and open the view.

A new sidebar should appear directly to the right of the folder group.

We want to start by adding just a few page elements into our view controller.

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