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Encoder Quick Response Code in Objective-C UIControl objects recognize a number of special events.

Table 6.5
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UIControl objects recognize a number of special events.
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Value Summary A finger touch. A repeated finger touch (with tapCount > 1). A finger movement ending inside the control. A finger movement ending just outside the control. A finger movement that enters the control. A finger movement that exits the control. A finger removed from the screen inside the control. A finger removed from the screen outside the control. A system event canceled a touch. A slider (or other similar) object changed its value. Editing began in a UITextField.
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UIControlEventTouchDown UIControlEventTouchDownRepeat UIControlEventTouchDragInside UIControlEventTouchDragOutside UIControlEventTouchDragEnter UIControlEventTouchDragExit UIControlEventTouchUpInside UIControlEventTouchUpOutside UIControlEventTouchCancel UIControlEventValueChanged UIControlEventEditingDidBegin
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An introduction to actions
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Table 6.5
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UIControl objects recognize a number of special events. (continued)
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Value Summary Editing changed in a UITextField. Editing ended in a UITextField due to a touch outside the object. Editing ended in a UITextField due to a touch. Composite for all the touch-related events. Composite for the editing-related events. Composite for all events.
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UIControlEventEditingChanged UIControlEventEditingDidEnd UIControlEventEditingDidEndOnExit UIControlEventAllTouchEvents UIControlEventAllEditingEvents UIControlEventAllEvents
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After a standard event has been turned into a control event, a sequence of additional methods is called, as shown in figure 6.6. First, the UIControl object calls sendActionsForControlEvents:. That in turn breaks down the events it s been sent and calls sendAction:to:forEvent: once per event. Here, the control event is turned into an action, which is a specific method that s going to be run in a specific target object. Finally, the UIApplication method sendAction:to:fromSender:forEvent: is called by the control, again once per event. This is another situation where the application object does big-picture controlling of messaging. The application sends the action to the target object. But there s one catch: if the target that the action is being sent to has been listed as nil, the action is sent to the first responder instead and from there moves up the responder chain. That process can be slightly exhausting, and fortunately you shouldn t normally need to know its details. For your purposes, you should be aware that a UIControl object turns a touch event first into a control event and then into an action with a specific recipient. Even better, you need to code only the last part of that conversion, from control event into targeted action.
Using addTarget:action:forControlEvents:
A UIControl object maintains an internal dispatch table that correlates control events with target-action pairs. This table says which method should be run by which object when a specified event occurs. You can add entries to this table with the UIControl object s addTarget:action:forControlEvents: method. The following example shows how it works:
[controlObject addTarget:recipientObject action:@selector(method) forControlEvents:UIControlEvents];
The first argument, addTarget:, says where the message will be sent. It s frequently set to self, which usually refers to a view controller that instantiated the control object. The second argument, action:, is the trickiest. First, note that it uses the @syntax that we mentioned in chapter 2. The selector should identify the name of the method that s going to be run in the target object. Second, be aware that you can send the
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Monitoring events and actions
action argument either without a colon (method) or with a colon (method:). In the latter case, the ID of the controlObject is sent as an argument. Be sure your receiving method is correctly defined to accept an argument if you include that colon in your selector. The third argument, forControlEvents:, is a bitmasked list of possible control events, taken from table 6.5. With all these puzzle pieces in place, you re ready to write some code that uses actions (and this method). As a simple example, you ll expand the functionality to your event reporter by adding a reset button.
Adding a button to an application
The simplest use of an action is probably adding a button to an application and then responding to the press of that button. As you ll see, this turns out to be a lot easier than digging through individual touches. We ve opted to show you how to work with a button in two ways: first by using the addTarget:action:forControlEvents: method that we just introduced and then by using Interface Builder s IBAction declaration. Both of these examples begin with your existing eventreporter program. You ll add a simple UIButton to it using Interface Builder. Place the button atop the label at the bottom of your page and use the attributes tag to label it Reset. With it in place and defined, it s ready to be linked into your program by one of two different ways. Both examples will call a method called resetPage:, which restores the three changeable objects in your eventreporter to their default states. It s in eventreporterViewController.m, and as you can see it s entirely elementary:
- (void)resetPage:(id)sender { startField.text = @"Begin: 159,230"; startField.center = CGPointMake(159,230); endField.text = @"Begin: 159,230"; endField.center = CGPointMake(159,230); bottomLabel.text = [NSString string]; }
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