![]() ![]() Returning to the creation of ebooks after a break can be tricky getting your head back around the concepts and the difficult to navigate IDPF documentation can induce moments of confusion. When is a page break not a page break? EPUB 3, page-list and pagebreak The black square represents the context: In Swift we could add the following code to the drawRect() method in order to draw the circle: // Decide on radius let rad = CGRectGetWidth(rect)/3.5 // End angle will be 2*pi for any circle that begins at 0 let endAngle = CGFloat(2*M_PI) // We could use CGContextAdd Drawing a circle With the context available to us, let's suppose we draw a circle at the centre of it. The code for this might look something like func buttonPressed(sender:AnyObject) The context provides the information on where to draw: "You can think of a graphics context as a drawing destination" ( Apple Developer ). (2) that we typecast to the subclass rather than accept the compiler's assumption that we are instantiating a regular UIViewController. ![]() (1) ensure that in the Class field we select the class we wish to utilise (see the box above the Storyboard ID in the above image) If we wish to call methods specific to a UIViewController subclass, however, we need to do two things: Self.presentViewController(viewController, animated: false, completion: nil) Update 2nd March 2016: And in Swift, it would look like this let viewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("ViewController") It is only within viewDidAppear: and methods later in the lifecycle where the presentation can take place and often a presentation will take place due to a user interaction. UIViewController *viewController = be aware that you must not place this code inside viewDidLoad. (5) now wherever you need to instantiate the view controller you simply write the following code (making sure that the strings you pass to storyboardWithName: and instantiateViewControllerWithIdentifier: match the name of the Storyboard and the Storyboard ID exactly, because Xcode won't catch any errors in these, it will instead crash at runtime) ![]()
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