Core Animation for Mac OS X and the iPhone: Creating by Bill Dudney

By Bill Dudney

I wrote up a protracted, special breakdown of the mess ups of this booklet on my weblog at [....], yet here is the quick version.The ebook wishes a couple of issues to achieve success, in particular in gentle of the recent crop of Cocoa builders coming round due to the iPhone. so much commence with the definitiveCocoa(R) Programming for Mac(R) OS X (3rd variation) via Aaron Hillegass and movement directly to know about particular framework applied sciences. As such, sure stylistic and programming conventions that experience come to symbolize "Cocoa programming best-practices" aren't adhered to in any respect. pattern initiatives are lazy in scope, regardless of the author's said purpose to "spark our imagination." pattern code is usually filled with ivars and techniques that are not even utilized in the undertaking. No reminiscence administration appears to be like used in any respect. Code fluctuates among utilizing "traditional" bracket notation and dot notation from undertaking to venture. and that i might cross on...The author's writing is very redundant, and the booklet may possibly use an editor who is not afraid to shrink and burn. There are lengthy passages that say not anything, and likely recommendations and statements that arise repeatedly. the place at the one hand the writer desires us to be happy to make "gaudy" issues to benefit the best way to combine middle Animation into the way forward for interface layout, he spends the higher a part of the e-book caution us opposed to doing precisely that. He turns out really terrified that he is unlocking Pandora's field upon the improvement neighborhood and should be in my opinion held in charge if issues commence going unsuitable in Cocoa initiatives from now, ahead. I humbly recommend this is not the author's function in my existence as a developer.Perhaps my greatest red meat with the publication is that its audience is ill-defined. it's certainly now not an creation to Cocoa, however it additionally attempts too challenging to carry the hand of more matured builders. So its too effortless for people with Cocoa event, yet too challenging for these with no event. i might quite like to see this e-book re-imagined as a logical next-step from the Hillegass ebook and dig in deeply to middle Animation. strengthen 3 or 4 deep, unique tasks, clarify the code improvement intimately, construct at the best-practices Hillegass teaches, and cater solely to a improvement neighborhood that is familiar with Objective-C and the way to exploit the Cocoa frameworks with out worry.

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Additional resources for Core Animation for Mac OS X and the iPhone: Creating Compelling Dynamic User Interfaces (Pragmatic Programmers)

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Another important aspect to keep in mind while putting your animations into groups is that their delegate is not called when the animation is run as part of a group. So if we were to set a delegate on the frameSize animation, it would not be called since that animation is in a group. On line 1, we see the frameAnimation: method. 5 times as big. Since no time values are set (via the keyTimes property), the animation uses the default timing of simply spreading the change out equally over the animation’s time span.

However, the constituent animations are not associated with any particular key (since they are in the group and not part of the animations dictionary) and thus will not cause any animation. So, we need to set their keyPaths. To do that, we can use animationWithKeyPath: at animation creation time, or we can set the keyPath property after creation. Don’t worry if this is not crystal clear right now; you will see in the example how to set this up. Another interesting point about the keys an animation is associated with is that they do not have to be associated with a key on the view they are animating.

We can even put a group into another group and have lots and lots of animations happening at the same time. Of course, we have to temper our imaginations by making sure that the animation is useful and not just eye candy. Here’s an example of nesting animations into a group in which we rotate and enlarge a picture. It starts at the center of the screen, grows and rotates, and then returns to its original position. 0 printing, October 2008) 35 G ROUPING A NIMATIONS Eye Candy and Animations Although it’s nice to have eye candy, if an effect does not provide a real benefit to the user, it will eventually become irritating.

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