Install Xcode and run you first app

Step 1:

 Go to http:developer.apple.com and login

Step 2:

     Click iOS

            

Double click the downloaded file to install Xcode

After install XCode , open it and click “Create a new Xcode project”

Click “Single View Application” and click next

Enter project name “Helloworld” and click next, then save the project

Click MainStoryboard.storyboard to show the first view

Drag and drop a LABEL object from the bottom right to the view

Single click on the label, click “Attributes inspector” on the top right.

Change the Text to “Hello World”

Select the Simulator, so far use “iPhone 5.0 simulator” and click “Run”

And it will show your first app