Ios-core Animation (Core animation)

Core animation is a very powerful calayer (not UIView) animation process that works across Mac OS X and iOS platforms Api,core Animation animation execution is done in the background and does not block the main thread.

Core animation inheritance Structure
Core animation Inheritance Structure Note: Virtual classes in core animations are not available and should use real classes in their subclasses. Steps for using Core animation

If it is a previous version of Xcode6, to import the <QuartzCore/QuartzCore.h> framework (there is no coreanimation frame)

Development steps:

1. First you have to have Calayer(because Coreanimation is a function of Calayer)

2. Initializes a Caanimation object and sets some animation-related properties

3. By calling the Calayer addAnimation:forKey: method, add the Caanimation object to the Calayer so that you can start the animation

4. removeAnimationForKey:You can stop the animation in Calayer by calling the Calayer method

Some of the properties in Caanimation:

• duration: Duration of animation

• repeatCount: Repeat number, infinite loop can be set huge_valf or maxfloat

• repeatDuration: Repeat Time

• removedOnCompletion: The default is Yes, which is removed from the layer after the animation has finished executing, and the drawing reverts to the state before the animation was executed. If you want the layer to remain displayed after the animation has been executed, set to No, but * also set Fillmode to Kcafillmodeforwards*

• beginTime: Can be used to set the animation delay execution time, if you want to delay 2s, set to CACurrentMediaTime()+2 , Cacurrentmediatime () is the current time of the layer

• timingFunction: Speed control function to control the rhythm of animation operation

• delegate: Animation agent

• fillModeDetermines the behavior of the current object during a non-active time period. (If you want Fillmode to work, it's best to set removedoncompletion = NO)

  • kCAFillModeRemovedThis is the default value, that is, when the animation starts and after the end of the animation, the animation has no effect on the layer, the end of the animation, the layer will revert to the previous state

  • kCAFillModeForwardsWhen the animation finishes, the layer retains the last state of the animation
    Kcafillmodebackwards before the animation begins, just add the animation to a layer,layer and immediately enter the initial state of the animation and wait for the animation to begin.

  • kCAFillModeBothThis is actually the composition of the above two. Before the animation joins, the layer is in the initial state of the animation, and the layer remains the last state of the animation after the animation finishes.

• CAMediaTimingFunction: Speed control function

  • kCAMediaTimingFunctionLinear(linear): constant speed, gives you a relatively static feeling

  • kCAMediaTimingFunctionEaseIn(progressive): Animation slowly enters, then accelerates to leave

  • kCAMediaTimingFunctionEaseOut(Fade Out): Animation enters at full speed, then slows down to the destination

  • kCAMediaTimingFunctionEaseInEaseOut(Gradual fade Out): The animation slowly enters, the middle accelerates, then slows down to reach the destination. This is the default animation behavior.

Caanimation Proxy method

Caanimation defines the proxy method in the taxonomy. is to add the classification to NSObject, so any object, become caanimation agent, all can.

• Called when the animation starts

  - (void)animationDidStart:(CAAnimation *)anim;

• Called when the animation stops

  - (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag;

Pause and resume animations on Calayer

• Time out

    -(void)pauseLayer:(CALayer*)layer  {     CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];     // 让CALayer的时间停止走动     layer.speed = 0.0;     // 让CALayer的时间停留在pausedTime这个时刻     layer.timeOffset = pausedTime;  }

• Recovery

    -(void)resumeLayer:(CALayer*)layer  {      CFTimeInterval pausedTime = layer.timeOffset;      // 1. 让CALayer的时间继续行走        layer.speed = 1.0;      // 2. 取消上次记录的停留时刻        layer.timeOffset = 0.0;      // 3. 取消上次设置的时间        layer.beginTime = 0.0;          // 4. 计算暂停的时间(这里也可以用CACurrentMediaTime()-pausedTime)      CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;      // 5. 设置相对于父坐标系的开始时间(往后退timeSincePause)        layer.beginTime = timeSincePause;  }

cabasicanimation--Basic Animations

• Basic animations, which are CAPropertyAnimation subclasses

• Property Description:

  • keyPath: The name of the property to change (pass string)

  • fromValue: KeyPath The initial value of the corresponding property

  • toValue: KeyPath the end value of the corresponding property

• Animation Process Description:

  • As the animation progresses, the value of the keypath corresponding property is gradually changed from Fromvalue to Tovalue during the duration of the duration length.

  • KeyPath content is an animated animatable property of Calayer

  • If fillMode=kCAFillModeForwards at the same time removedOnComletion=NO , after the animation finishes, the layer remains displayed after the animation is executed. but in essence, the property value of the layer is still the initial value before the animation is executed, and it is not really changed.

cakeyframeanimation--Key-Frame animations

• Keyframe animation, also capropertyanimation subclass, differs from Cabasicanimation:
  Cabasicanimation can only change from one numeric value (Fromvalue) to another (Tovalue), and Cakeyframeanimation saves the values with a Nsarray

• Property Description:

  • values: The Nsarray object above. The elements inside are called "keyframes" (keyframe). The animated object displays each keyframe in the values array in the specified time (duration), in turn
  • path: You can set a cgpathref, Cgmutablepathref, and let the layer move along the path trajectory. Path only works on Calayer's anchorpoint and position. If path is set, then values will be ignored
  • keyTimes: You can specify a corresponding point in time for the corresponding keyframe, with a value range of 0 to 1.0,keytimes each time value corresponds to each frame in values. If Keytimes is not set, the time of each keyframe is equally divided

Cabasicanimation can be seen as a cakeyframeanimation with only 2 keyframes

caanimationgroup--Animation Group

• Animation group, is a CAAnimation subclass that can hold a set of animated objects, after the object is joined to the CAAnimationGroup layer, all animation objects in the group can concurrently run

• Property Description:

  • animations: A nsarray used to hold a set of animated objects

By default, a set of animated objects runs concurrently, or you can change the start time of an animation by setting the BeginTime property of the animated object

Transition Animation--catransition

• CATransitionis a CAAnimation subclass that is used to animate transitions, providing the ability to animate layers to move out of the screen and into the screen. iOS has less transition animations than Mac OS X
  Uinavigationcontroller is the animation effect of pushing the controller's view into the screen via catransition

• Animation properties:

  • type: Animation Transition Type
  • subtype: Animation transition Direction
  • startProgress: Start of animation (percentage of overall animation)
  • endProgress: End of animation (percentage of overall animation)

1. Single View

+ (void)transitionWithView:(UIView *)view duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion;

• Parameter description:
  • duration: Duration of animation
  • view: A view that requires a transition animation
  • options: Type of transition animation
  • animations: Place code that changes the properties of the view in this block
  • completion: This block is automatically called after the animation is finished.

2. Dual View

+ (void)transitionFromView:(UIView *)fromView toView:(UIView *)toView duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options completion:(void (^)(BOOL finished))completion;

• Parameter description:
  • duration: Duration of animation
  • options: Type of transition animation
  • animations: Place code that changes the properties of the view in this block
  • completion: This block is automatically called after the animation is finished.

3. Write your own transitions

• To create a transition animation:[CATransition animation]
• Set Animation property values
• Add to a layer that requires transition animations[layer addAnimation:animation forKey:nil]

Type of transition animation (NSString *type)

• fade: Cross-fade transitions
• push: New view launches old view
• moveIn: The new view is moved above the old view
• reveal: Moves the old view away, showing the new view below
• cube: Cube Rollover Effect
• oglFlip: Flip effect up or down
• suckEffect: Shrinkage effect, like a piece of cloth being pumped away
• rippleEffect: Drop Effect
• pageCurl: Page UP effect
• pageUnCurl: Page DOWN effect
• cameraIrisHollowOpen: Camera lens Open effect
• cameraIrisHollowClos: Camera lens off effect

Direction of transition Animation (NSString *subtype)

• Start in One Direction:,, fromLeft fromRight fromTop ,fromBottom

Coreanimation in the CALayer1. Careplicatorlayer: Copying layers

As the name implies, duplicate layers are used to replicate. It copies its own sublayers, along with the animations on the child layer.

• Property Description:

  • instanceCount: Copy number of copies. (The original sublayer will be copied how many copies, including the original copy)

  • instanceTransformDeformation Each relative to the last part of the shape variable

  • instanceDelay: A delay in the time of each relative to the last share.

• Modify the Careplicatorlayer color channel to change the style of the Careplicatorlayer display

  • @property float instanceRedOffset ;
  • @property float instanceGreenOffset ;
  • @property float instanceBlueOffset ;
  • @property float instanceAlphaOffset ;

2. Cashapelayer: Shape layer

Layers that draw content based on the shape

• Property Description:

  • path: Describes the path to a shape. The path is closed by default and then populated.

  • fillColor: The color of the fill

  • strokeColor: The color of the stroke (if you want to just stroke it, set FillColor to Clearcolor.)

  • strokeStart: The scale "0-1" at which the stroke begins

  • strokeEnd: The ratio "0-1" for ending strokes

3. Cagradientlayer: Gradient Layer

With this layer, you can make the color gradient

• Property Description:

  • colors: Save all gradient colors, inside is cgcolorref, remember to use ID, let the compiler think that the array is OC object.

  • locations: Save the position of all gradients "0-1"

  • startPoint: Start gradient point "0-1"

  • endPoint: End gradient of point "0-1"

At last:

• The core animation shows us just an illusion that the frame, bounds, and position of the layer will not change after the animation has finished.

• UIView encapsulated animations will make it true to modify some of the properties of the view.

Website API:Core Animation

Ios-core Animation (Core animation)