By Rich Warren
Indicates the best way to enhance and layout iOS five applications.
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Extra info for Creating iOS 5 apps : develop and design
This structure has two fields, x and y. In this case, both fields happen to be the same data type (CGFloat). Next, we use typedef to define a type named CGPoint. This is an alias for the CGPoint struct. That may seem odd, but it is actually quite helpful. If we didn’t have the typedef, we would constantly have to refer to this entity as “struct CGPoint” in our code. Now, however, we can drop the struct keyword and treat it like any other data type. You access the fields as shown: CGPoint pixelA; // Creates the CGPoint variable.
The will methods are called just before the event takes place. The did methods are called just after. Look up UIViewController in the developer documentation to see the complete list (click it to open the Quick Help inspector, and then click the name link to open the full description). If you scan through this file, you will see that it includes a number of these as method stubs. Most have default implementations that don’t do anything; they just call the superclass’s implementation. There are only three methods containing functional code: shouldAutorotateTo InterfaceOrientation:, flipsideViewControllerDidFinish:, and prepareFor Segue:sender:.
Refining the Interface Functionally, everything’s OK, but it’s not the most polished (or, for that matter, useful) app in the world. Let’s make it a little bit better. When the flipside view appears, let’s fill the text field with the label’s current value. Additionally, let’s go ahead and dismiss the flipside view when the user taps the Return key. Let’s start by passing the text from our main view’s label to our flipside view. Ideally, we would like to set this value in our prepareForSegue:sender: method.
Creating iOS 5 apps : develop and design by Rich Warren