2014/10/15 下午 10:11:57

iphone Programming Glossary: needsdisplayforkey

http://stackoverflow.com/questions/14192816/create-a-custom-animatable-property

and implement your custom void drawInContext CGContextRef context You can make an animatable property by overriding needsDisplayForKey in your custom CALayer class like this BOOL needsDisplayForKey NSString key if key isEqualToString @ percentage return YES.. You can make an animatable property by overriding needsDisplayForKey in your custom CALayer class like this BOOL needsDisplayForKey NSString key if key isEqualToString @ percentage return YES return super needsDisplayForKey key Of course you also need.. class like this BOOL needsDisplayForKey NSString key if key isEqualToString @ percentage return YES return super needsDisplayForKey key Of course you also need to have a @property called percentage . From now on you can animate the percentage property..

Animating a custom property of CALayer subclass

http://stackoverflow.com/questions/2395382/animating-a-custom-property-of-calayer-subclass

CA implements the accessors for you @dynamic myInt Tell the layer that changes of the property require redrawing BOOL needsDisplayForKey NSString key if key isEqualToString @ myInt return YES else return super needsDisplayForKey key Use the value of myInt.. require redrawing BOOL needsDisplayForKey NSString key if key isEqualToString @ myInt return YES else return super needsDisplayForKey key Use the value of myInt in your drawInContext method. Now when you animate myInt Core Animation will interpolate the..

Why animating custom CALayer properties causes other properties to be nil during animation?

http://stackoverflow.com/questions/4016496/why-animating-custom-calayer-properties-causes-other-properties-to-be-nil-during

ctx self.tint.CGColor CGContextFillPath ctx I want the radius to be animatable so I've implemented BOOL needsDisplayForKey NSString key if key isEqualToString @ radius return YES return super needsDisplayForKey key And the animation is performed.. so I've implemented BOOL needsDisplayForKey NSString key if key isEqualToString @ radius return YES return super needsDisplayForKey key And the animation is performed like this CABasicAnimation theAnimation CABasicAnimation animationWithKeyPath @ radius..

Marrying Core Animation with OpenGL ES

http://stackoverflow.com/questions/4500708/marrying-core-animation-with-opengl-es

nonatomic assign CGPoint sceneCenterPoint I then declare the property @dynamic to let CA create the accessors override needsDisplayForKey and implement drawInContext to pass the current value of the sceneCenterPoint property to the renderer and ask it to render.. it to render the scene #import GLLayer.h @implementation GLLayer @synthesize renderer @dynamic sceneCenterPoint BOOL needsDisplayForKey NSString key if key isEqualToString @ sceneCenterPoint return YES else return super needsDisplayForKey key void drawInContext.. BOOL needsDisplayForKey NSString key if key isEqualToString @ sceneCenterPoint return YES else return super needsDisplayForKey key void drawInContext CGContextRef ctx self.renderer.centerPoint self.sceneCenterPoint self.renderer render ... If you..

Animate a custom property using CoreAnimation in Monotouch?

http://stackoverflow.com/questions/9544591/animate-a-custom-property-using-coreanimation-in-monotouch

Thickness get set public CGColor Color get set public float GlowAmount get set private SizeF GlowOffset get set Export needsDisplayForKey static bool NeedsDisplayForKey NSString key Console.WriteLine key.ToString if key.Equals radius return true else return..