vb.net print barcode labels We can now look at the two ways you can call this method. in Objective-C

Create QR Code ISO/IEC18004 in Objective-C We can now look at the two ways you can call this method.

We can now look at the two ways you can call this method.
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Using addTarget:action:forControlEvents: with a button
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On the one hand, you may wish to add actions to your button programmatically. This could be the case if you created your button from within Xcode or if you created your button in Interface Builder but want to change its behavior during runtime. Your first step is bringing your button into Xcode. If you created your button in Interface Builder, as we suggested earlier, you need to create an IBOutlet for the button, which should be old hat by now. If you didn t create your button in Interface Builder, you can do so in Xcode. This probably means using the factory class method buttonWithType:, which lets you create either a rounded rectangle button or one of a few special buttons, like the info button. By either means, you should now have a button object available in Xcode.
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Adding a button to an application
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Your second step is to send the addTarget:action:forControlEvents: message as part of your application s startup. Assuming that you re having your view controller manage the button s action, this message should be sent from the view controller s loadView method (if your controller was created in Xcode) or in its viewDidLoad method (if you created the controller in Interface Builder). Here s what the viewDidLoad method of your view controller looks like when applied to a button called myButton:
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- (void)viewDidLoad { [myButton addTarget:self action:@selector(resetPage:) forControlEvents:UIControlEventTouchUpInside]; [super viewDidLoad]; }
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This real-life example of addTarget:action:forControlEvents: looks much like the sample in the previous section. You re sending a message to your button that tells it to send the view controller a resetPage: message when the user takes their finger off the screen while touching the button. That single line of code is all that s required; from there on out, your button will connect to your resetPage: method whenever it s pushed (and released).
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Using an IBAction with a button
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The other way you can link up actions to methods is to do everything inside Interface Builder. This is the preferred choice if you ve created your object in Interface Builder (as we ve suggested) and you re not planning to change its behavior at runtime. When you use this procedure, you don t need to make your button into an IBOutlet. It s effectively invisible from Xcode, which is fine, because all you care about is what happens when the button is pushed. You also don t use the somewhat complex addTarget:action:forControlEvents: method that we just ran through; instead, you connect things via intuitive Interface Builder means. For the purposes of this example, start with a clean slate: with a button freshly crafted inside Interface Builder and no connections yet built. To link an object in Interface Builder to an action in Xcode, you must declare the method you re using as having a return of IBAction. This means adding the following declaration to the header file of your view controller:
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- (IBAction)resetPage:(id)sender;
The implementation of the method should share the same return. Afterward, you can go into Interface Builder and create a connection, as shown in figure 6.7. As shown, when you re connecting a control, Interface Builder gives you access to the entire palette of possible control events. You select the one (or ones) that you want to connect to IBActions, and then you drag over to the top-level object containing your IBAction. In this case, that s once again the file s owner object, which represents your view controller. As usual, a menu pops up, this time showing possible IBActions to which you can link your control event.
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Monitoring events and actions
Figure 6.7 With an IBAction, there s no code, just a link.
The results are almost magical. With that single graphical link, you replace the addTarget:action:forControlEvents: call and any code of any type. The button now links to the targeted action automagically. What we ve described so far covers the broad strokes of actions; everything else lies in the details. If we spent less time on actions than events, it s not because actions are less important than events, but because they re a lot simpler. From here on, your challenge in using controls will be figuring out how individual controls work. See appendix A for an overview of classes and the Apple Class References for specifics. But there are a few controls that we d like to give more attention to because they vary from the norm.
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