By Dan Pilone; Tracey Pilone
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Extra info for Head first iPhone and iPad development : [covers iOS 4 SDK and Xcode 4]
4 Talk about it. Out loud. 9 Create something! Apply this to your daily work; use what you’re learning to make decisions on your projects. Just do something to get some experience beyond the exercises and activities in this book. All you need is a pencil and a problem to solve…a problem that might benefit from using the tools and techniques you’re studying for the exam. Your brain works best in a nice bath of fluid. Dehydration (which can happen before you ever feel thirsty) decreases cognitive function.
We’ll be using the Touch Up Inside event. Components dispatch events when things happen to them Whenever something happens to a component—for instance, a button gets tapped—the component dispatches one or more events. What we need to do is tell the button to notify us when that event gets raised. We’ll be using the TouchUpInside event. If you think about how you click a button on an iPhone or iPad, the actual click inside the button isn’t what matters: it’s when you remove your finger (or “touch up”) that the actual tap occurs.
The IBOutlet is a refere nce to the label that we’ll chan ge the text on the button, and the IBAction specifies what will actually happen when the button is pressed. This is implementation code. Here, we’re defining the method that is called when the button is pressed. We use a consta nt string to change the text in the label. Remember, decisionText is a reference to th e UILabel we created in Interface Builder. m [decisionText_ release]; } [super dealloc]; 22 Chapter 1 mory management. The release call is for me nce counting for Objective-C uses refere l talk more about memory management (we’l to be released to this in a bit) and needs free up the memory.