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There is one instance variable declared of type UILabel:. IBOutlet IBOutlet UILabel *randNumber; //instance variable As are reminder, outlets (pointers) are declared in our object s interface file are connected to specific instance variables. There is also a declaration that is probably new to you. It is called an IBOutlet and is commonly referred to as an outlet. Outlets signal your controller that this instance variable is a pointer to another object that is set up in Interface Builder. IBOutlet will enable Interface Builder to see the outlet and enable you to connect the variable to the object in Interface Builder. Using the analogy of an electrical wall outlet, these instance variables outlets are connected to objects. Using Interface Builder we can connect these instance variables to the appropriate object. Because Interface Builder will be accessing randNumber outside the object, we need to provide the setter and getter methods for randNumber:

Drag a SequenceActivity onto the createTasks activity. Drag a CreateTaskWithContentType activity onto the SequenceActivity, and rename it to createTask. Drag a WhileActivity below this, and then drag an OnTaskChanged activity onto the WhileActivity. The workflow diagram should look like Figure 11-15.

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You may have noticed that there s another animation we haven t used yet that shows Lazarus looking afraid. We re going to show this animation when he s in a hopeless situation and knows he is about to meet his end. However, rather than create a new object for this animation like we did with the others, we re just going to change the sprite of the standing Lazarus object when he becomes afraid. We can do this because being afraid does not need any actions of its own: it has exactly the same behavior as standing it just looks different. We re going to control this animation within the Step event, so that the correct animation is chosen at any point in time. We will use Check Collision actions to detect if Lazarus is surrounded by stacks of boxes two or more high on both sides. The Check Collision action performs actions only when there is a collision at a particular point. In this way, we can detect whether Lazarus is trapped on all sides and set his animation to be afraid.

We used retain, so we will need to release the memory allocated for this instance variable in the Implementation file.

Figure 11-15. The workflow diagram The red circles indicate errors because the activities are not configured yet; you ll get to that shortly. This pattern is a typical one that you will undoubtedly use often. You create a task and then put an OnTaskChanged handler inside a while loop, waiting for the appropriate conditions to exit the loop. In this case, you re waiting for the task to be completed.

Editing the standing Lazarus object to detect for being trapped: 1 Reopen the standing Lazarus object and select its Step event, so that you can see the existing actions for this event 2 Include the Check Collision conditional action (control tab) below the last action in the list Set X to 40 and Y to 0, and enable the Relative option This checks for a box to the right of Lazarus 3 Include another Check Collision action with X set to 40, Y set to -40, and the Relative option enabled This checks for a box diagonally to the right of Lazarus 4 Include two more Check Collision actions: one with X set to -40 and Y set to 0, and the other with X set to -40 and Y set to -40 Both should have the Relative option enabled.

We mentioned at the beginning of this chapter that actions, which our objects trigger in our views when events fire, are connected to our targets (object methods) in the app s code. Our RandomNumberViewController object has two methods:

Correlation tokens allow you to associate activities that need to be performed on the same object instance. For example, in Figure 11-15, the createTask activity and the onTaskChanged1 activity should operate on the same task instance. You ensure this by assigning the same correlation token to both. If you had other CreateTask/OnTaskChanged activity pairs in your workflow, you would assign a different correlation token to them. There are generally two types of correlation tokens. You ll use one at the workflow level and one at the task level. The project template already set up a token at the workflow level called workflowToken, as shown in Figure 11-16.

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