creating your first ios app

7/29/2019 Creating Your First iOS App

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http://www.instructables.com/id/Creating-your-first-iOS-app/

Food Living Outside Play Technology Workshop

Creating your first iOS appby A-Nony-Mus on August 14, 2012

Table of Contents

Creating your first iOS app .......................................................................................................

Intro: Creating your first iOS app ...............................................................................................

Step 1: Get Xcode ..........................................................................................................

Step 2: Open Xcode & set up the project .........................................................................................

Step 3: Write the code .......................................................................................................

Step 4: Connect the UI ......................................................................................................

Step 5: Run the app ........................................................................................................

Step 6: Have some fun by adding things programmatically ............................................................................

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Intro: Creating your first iOS appLooking around this site, it occurred to me that there weren't many 'ibles on programming the iOS platform, so I thought I'd fix that deficit. This is a simple "hello, worldapp for iPhone (or iPod Touch, or iPad). This 'ible will also serve the purpose of helping others become familiar with the IDE known as Xcode, which is what you needyou want to program for the iOS platforms.

Image Notes1. Hello World!

Step 1:Get XcodeIf you already have Xcode, you can skip this step.

If you want to develop apps for iOS, you need the SDK, which is provided with Xcode. Xcode only runs on Mac OS X (yes, Apple is doing that on purpose), so if you arunning a windows (or linux, or pretty much any non-Mac OS X) operating system, you have a couple options:

1. Get a mac, by far the easiest, but it can be rather expensive.

2. Find a friend with a mac, if they are nice, they'll let you use it for programming, you should warn them, however, that programming takes a long time.

3. Give up, Those are your legal options, there are some other options that are either illegal, or are in the gray area (meaning it's debatable whether or not it is illegal),I am not mentioning them, you want to know them, find them yourself, I won't be responsible.

Now that's settled, onto the IDE. Go to the mac app store (available in mac os x 10.6.8 and later) and search Xcode. It's the first option, click on it. Download it, it's alengthy download, ~4 Gb, so if you have a slow internet connection you may want to consider doing something else while it is downloading.

Image Notes1. search for Xcode2. First result, also happens to be the only free one

Image Notes1. Yours will say download

Step 2:Open Xcode & set up the project1. Open Xcode.2. Go to File>New>Project.3. Click on Single View Application and click next.4. Name it Hello World!5. Decide whether you want it to be an iPhone app, an iPad app, or universal (I will be doing iPhone)6. Make sure use storyboards and Use Automatic Reference Counting are checked7. Click Next8. Navigate to where you want to save the file and click Create


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Image Notes1. I Selected iPhone2. Name it Hello World3. Make sure Use Storyboards and Use Automatic Reference Counting are checked4. Click next

Step 3:Write the codeYou will be doing the programming in the ViewController.m file, but it doesn't hurt to look at the other files. The MainStoryboard.Storyboard file is the UI, we'll deal withthat later. The appDelegate is what is called on startup, in this tutorial, we will be leaving that alone.

Ok, time to start programming.

1. Open up ViewController.h

2. Between @interface ViewController : UIViewController and @end add the following code:@property (strong, nonatomic)IBOutlet UILabel *label;This is the label that will show the Hello World text. If an empty circle appeared next to the l ine of code, then you wrote it right

3. Go to ViewController.m

4. Under @implementation ViewController add @synthesize label; and in the viewDidUnload function add [self setLabel:nil];

5. In viewDidLoad, add the following code: self.label.text = @"Hello World!";

6. That completes the programming for now

Image Notes

1. Notice the circle


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Image Notes1. viewDidUnload function2. @synthesize label3. viewDidLoad function

Step 4:Connect the UINext We'll deal with the UI.

1. Open MainStoryboard.Storyboard

2. Find a label and drag it onto the view (if this sounds confusing, refer to the picture)

3. Resize the Label to your liking by clicking and dragging on the squares in the corners of the label

4. Go to the Attributes inspector (if you are not already there, refer to the picture)

5. Make sure it is centered, and choose the font and size you want. I will stay with the system font, but scale it up to size 25

6. Open the Assistant Editor, it should open ViewController.h, if not, you need to change it to ViewController.h (again, refer to the picture)

7. Remember that circle I told you about earlier? Click and drag from it to the label you just added. If you did it right, the circle should be filled

Image Notes1. Click this if you don't get the right hand bar

Image Notes1. Click and drag this to the view2. View, drag the label to here3. Label4. Attributes Inspector


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Image Notes1. Font Preferences2. Center Text3. Resize Square

Image Notes1. Click and drag from here to the label2. The label will highlight when you connect it properly3. Assistant Editor4. Click on this to change files

Image Notes1. Circle is filled now

Step 5:Run the appThat's it! Hit the Run Button and if you did everything correctly, your app will say Hello World!Pat yourself on the back, you just wrote your first app.



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Step 6:Have some fun by adding things programmaticallyTo make it a little more advanced, we are going to add everything programmatically.

1. Delete the label we added to the UI as well as all the code we wrote up to this point.

2. Open ViewController.h and add the Following code between the @interface ViewController: UIViewController and @end:@property (strong, nonatomic)UILabel *label;Notice how a circle did not appear this time? That's an indication that you did it correctly

3. In ViewController.m add @synthesize label; right beneath @implementation ViewController and add [self setLabel:nil]; in the viewDidUnload function.

4. In the viewDidLoad function add the following lines of code://Define where the label will be displayedself.label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, 100)];

//Define the text to be displayedself.label.text = @"Hello World";//Center the Textself.label.textAlignment = UITextAlignmentCenter;//Programmatically add the label to the view[self.view addSubview:self.label];

5. Hit run and admire your handiwork, you've completed your first iOS application

Image Notes1. Notice there is no circle

Image Notes1. Add this code



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