Objective-C Fundamentals

Hooking up the user interface
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With the buttons taken care of, you’re left with connecting the label controls to the
CoinTossViewController class to allow the code to update the user interface with the
results of the latest coin toss.
To connect the label controls, you can use a similar drag-and-drop operation.
This time, while holding down the Control key, click the icon representing the
CoinTossViewController instance and drag it toward the label in the view. When
you release the mouse, a pop-up menu appears that allows you to select which property
of the CoinTossViewController class you want to connect the label control to.
This process is demonstrated in figure 1.9. Using this process, connect the label
titled Coin Toss to the status property and the label titled Select Heads or Tails to
the result property.
When deciding which way you should form connections between objects, consider
the flow of information. In the case of the button, tapping the button causes a method
Figure 1.9 Visually forming a connection between the status instance variable and the label control in the user
interface by dragging and dropping between the items (with the Control key held down)