[x] Under Outlets, you should see names like countTextField, slider, and stepper. Go to the CounterViewController.swift file and look at the top of the file under the line class CounterViewController. You should see properties with the same names. Go back to the storyboard and click and drag from the empty circle next to these names to their appropriate UI element in the storyboard view. You are wiring up your interface elements to their corresponding properties in code. This allows you to manipulate them in code. Once you connect these outlets to the UI elements in the view, the empty circles should fill in. You can also then hover your mouse over the outlet in the list and the associated element will be highlighted in the view.
[x] In the same tab (the connections inspector), there is another section labelled, received actions. There should be three names listed. Each of them are methods in the code that will run certain instructions. We need to connect them to the appropriate UI elements so when certain actions are taken by the user, these methods will be triggered. For sliderValueChanged: and stepperValueChanged:, simply drag from the empty circles to the appropriate UI element in the view. When you let go of the mouse over the element, several event types will appear. Take a guess which one to use.
[x] The third item under received actions is called viewTapped:. This is a method that will cause the keyboard to hide in the case where the user has tapped the textfield and edited the value. We need to connect it to something called a gesture recognizer. It does what you'd expect; it recognizes gestures. I've already set up a tap gesture recognizer that will fire whenever the main view is tapped. To wire it up to our method viewTapped:, simply drag from the empty circle to the top of our view where the four little icons are. The third icon from the left (the small grey square with a blue circle in the corner) is our gesture recognizer. Drag the line from the empty circle to this icon. It will blink and then the circle next to viewTapped: will be filled in.
Everything in our storyboard view is now properly wired up to the appropriate variables/methods in our code! When UI elements are touched by our user, the code in our view controller will be invoked.
Code Tasks
The following steps are numbered. You will find corresponding comments in the CounterViewController.swift file with the same numbers.
[ ] 1. Here you are calling a method. A method is a collection of instructions that are executed together. Anything listed in CounterViewController with the keyword func in front of it is a method . Read the comment and try to figure out which method we should call here (the method exists somewhere in the file).
[ ] 2. What variable from the top of the class should we use to update the textfield?
[ ] 3. What value should the slider show?
[ ] 4. And the stepper (detecting a pattern here)?
[ ] 5. What property of sender should we use (Big hint in the comment for this one)?
[ ] 6. What method should we call here?
[ ] 7. This looks suspiciously similar. What goes in these blanks?
[ ] 8. After we hide the keyboard and update the currentCount variable, what should we do?
Connections Inspector
class CounterViewController. You should see properties with the same names. Go back to the storyboard and click and drag from the empty circle next to these names to their appropriate UI element in the storyboard view. You are wiring up your interface elements to their corresponding properties in code. This allows you to manipulate them in code. Once you connect these outlets to the UI elements in the view, the empty circles should fill in. You can also then hover your mouse over the outlet in the list and the associated element will be highlighted in the view.Everything in our storyboard view is now properly wired up to the appropriate variables/methods in our code! When UI elements are touched by our user, the code in our view controller will be invoked.
Code Tasks
The following steps are numbered. You will find corresponding comments in the CounterViewController.swift file with the same numbers.
funcin front of it is a method . Read the comment and try to figure out which method we should call here (the method exists somewhere in the file).