iOS Core Animation: Advanced Techniques

Core Animation is the know-how underlying Apple’s iOS person interface. by means of unleashing the whole energy of middle Animation, you could improve your app with extraordinary 2nd and 3D visible results and create interesting and designated new interfaces.

during this in-depth advisor, iOS developer Nick Lockwood takes you step by step throughout the center Animation framework, increase your figuring out via pattern code and diagrams including complete motives and necessary guidance. Lockwood demystifies the middle Animation APIs, and teaches you ways to make use of

  • Layers and perspectives, software program drawing and compositing
  • Layer geometry, hit checking out and clipping
  • Layer results, transforms and 3D interfaces
  • Video playback, textual content, tiled photographs, OpenGL, debris and reflections
  • Implicit and particular animations
  • Property animations, keyframes and transitions
  • Easing, frame-by-frame animation and physics
  • Performance tuning and lots more and plenty, a lot more!

Approximately 356 pages.

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There's nonetheless a few pop-in if we scroll in a short time, yet for regular scrolling it’s now beautiful infrequent, and the caching signifies that we’re doing much less loading besides. Our preloading good judgment is particularly crude in the mean time, and will be greater by means of making an allowance for the scroll velocity and path of the carousel, yet it’s already considerably greater than our uncached model. dossier layout snapshot loading functionality relies crucially on a tradeoff among the time taken to load a bigger snapshot dossier structure and the time taken to decompress a smaller one.

0001 could additionally paintings, yet be cautious of utilizing very tiny values simply because this may result in visible system faults due to rounding mistakes within the floating-point calculations. directory three. three Adjusting zPosition to alter the show Order click on the following to view code photograph * * * @interface ViewController () @property (nonatomic, susceptible) IBOutlet UIView *greenView; @property (nonatomic, susceptible) IBOutlet UIView *redView; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; //move the golf green view zPosition closer to the digicam self.

Five fastened Time Step Crate Simulation click on the following to view code snapshot * * * #define SIMULATION_STEP (1/120. zero) - (void)step:(CADisplayLink *)timer { //calculate body step length CFTimeInterval frameTime = CACurrentMediaTime(); //update simulation whereas (self. lastStep < frameTime) { cpSpaceStep(self. area, SIMULATION_STEP); self. lastStep += SIMULATION_STEP; } //update the entire shapes cpSpaceEachShape(self. house, &updateShape, NULL); } * * * averting the Spiral of demise something you want to ascertain whilst utilizing fastened simulation time steps is that the real-world time taken to accomplish the physics calculations doesn't exceed the simulated time step.

Absolutely we will be able to do this half ourselves besides? NSTimer really, we already did whatever like that during bankruptcy three, “Layer Geometry,” with the clock instance, once we used an NSTimer to animate the hand circulation. In that instance, the hand in simple terms up-to-date as soon as in line with moment, however the precept is actually no various if we accelerate the timer to fireside 60 occasions in step with moment as a substitute. Let’s attempt enhancing the bouncing ball animation from bankruptcy 10 to exploit an NSTimer rather than a CAKeyframeAnimation. simply because we are going to now be calculating the animation frames regularly because the timer fires (instead of in advance), we want a few extra homes in our category to shop the animation’s fromValue, toValue, period, and the present timeOffset (see directory eleven.

TextAlignment = NSTextAlignmentCenter; [button addSubview:label]; go back button; } - (void)viewDidLoad { [super viewDidLoad]; //create opaque button UIButton *button1 = [self customButton]; button1. heart = CGPointMake(50, 150); [self. containerView addSubview:button1]; //create translucent button UIButton *button2 = [self customButton]; button2. heart = CGPointMake(250, 150); button2. alpha = zero. five; [self. containerView addSubview:button2]; //enable rasterization for the translucent button button2.

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