You already have a method to add cars. All you need is a user interface item to call it. Look at an app with table views that allow the creation of data items, such as Contacts. Apps like these commonly have an Add button in the navigation bar. Here’s how you implement one in the CarValet app:
1. Open the storyboard and drag a bar button item into the navigation bar of the add/view scene.
2. Select the Attributes inspector for that button and change the identifier to Add. You see the button change to one with a + icon.
3. Ctrl-drag from the button to the car table view controller and choose
newCar: under Sent Actions.
Run the app and tap the Add button. Nothing seems to happen. In fact, cars are added, but nothing is telling the ...