For details about the performance of UIView animation in iPhone, refer to the document (I)

IPhoneApplicationUIView AnimationThe implementation effect is the content to be introduced in this article, mainly to introduceUIView AnimationFirst, let's look at the details.

Returns a Boolean value indicating whether the animation ends.

 
 

  
  
+ (BOOL)areAnimationsEnabled 
 
 

Return Value

If the animation ends, YES is returned; otherwise, NO is returned.

 
 

  
  
beginAnimations:context: 
 
 

Start an animation Block

 
 

  
  
+ (void)beginAnimations:(NSString *)animationID context:(void *)context 
 
 

Parameters

AnimationID

The internal application identifier of the animation block is used to pass the message to the animation proxy-This selector is set using setAnimationWillStartSelector: And setAnimationDidStopSelector.

Context

The additional application information is used to pass the message to the animation proxy-This selector uses setAnimationWillStartSelector: And setAnimationDidStopSelector: method.

Discussion

This value is changed because some attributes that need to be generated in the animation block are set. Animation blocks can be nested. If it is not called in an animation block, the setAnimation class method will do nothing. Use beginAnimations: context: to start an animation block and use the commitAnimations class method to end an animation block.

CommitAnimations

End an animation block and start when it is outside the animation block.

 
 

  
  
+ (void)commitAnimations 
 
 

Discussion

If the current animation block is the outermost animation block, the animation block starts when the application returns to the loop. All applications of an animation in an independent thread will not be interrupted. With this method, multiple animations can be implemented. View the setAnimationBeginsFromCurrentState: to learn if an animation starts when another animation is playing.

LayerClass

The returned class is used to create a layer instance object of this class.

 
 

  
  
+ (Class)layerClass 
 
 

Return Value

A class used to create a view layer

Discussion

Override subclass to specify a custom class for display. Called when creating a view layer. The default value is a CALayer class object.

SetAnimationBeginsFromCurrentState
:
Set the animation to start playing from the current status.

 
 

  
  
+ (void)setAnimationBeginsFromCurrentState:(BOOL)fromCurrentState 
 
 

Parameters

FromCurrentState

YES if the animation needs to be played from their current status. Otherwise, it is NO.

Discussion

If it is set to YES, when the animation is running, the current view position will be used as the starting state of the new animation. If it is set to NO, the new animation uses the position of the last state of the view as the start state before the current animation ends. This method will not do anything if the animation is not running or not called outside the animation block. Use beginAnimations: context: Class Method to start and use the commitAnimations class method to end the animation block. The default value is NO.

SetAnimationCurve
:
Set the curve of the animation attribute change in the animation block.

 
 

  
  
+ (void)setAnimationCurve:(UIViewAnimationCurve)curve 
 
 

Discussion

The animation curve is the relative speed during the animation operation. This method will be invalid if it is called outside the animation block. Use beginAnimations: context: Class Method to start an animation block and use commitAnimations to end the animation block. The default animation curve value is UIViewAnimationCurveEaseInOut.

SetAnimationDelay:

Set the animation delay attribute in seconds in the animation block)

 
 

  
  
+ (void)setAnimationDelay:(NSTimeInterval)delay 
 
 

Discussion

This method is invalid when it is called outside the animation block. Use beginAnimations: context: Class Method to start an animation block and use the commitAnimations class method to end the animation block. The default animation delay is 0.0 seconds.

SetAnimationDelegate:

Sets the animation message proxy.

 
 

  
  
+ (void)setAnimationDelegate:(id)delegate 
 
 

Parameters

Delegate

You can use setAnimationWillStartSelector: And setAnimationDidStopSelector: to set the object for receiving proxy messages.

Discussion

This method has no effect on the animation block. Use beginAnimations: context: Class Method to start an animation block and use the commitAnimations class method to end an animation block. The default value is nil.

SetAnimationDidStopSelector:

Set the message to the animation proxy when the animation is stopped.

 
 

  
  
+ (void)setAnimationDidStopSelector:(SEL)selector 
 
 

Parameters

Selector

Send the animation to the animation proxy when the animation ends. The default value is NULL. The selector must have the signature of the following method: animationFinished :( NSString *) animationID finished :( BOOL) finished context :( void *) context.

AnimationID

The identifier provided by an application. Same as beginAnimations: context. This parameter can be blank.

Finished

If the animation is completed before it is stopped, YES is returned; otherwise, NO is returned.

Context

An optional application content provider. Same as beginAnimations: context: method. It can be null.

Discussion

This method has no effect on the animation block. Use beginAnimations: context: Class Method to start an animation block and end with the commitAnimations class method. The default value is NULL.

Summary: DetailsIPhoneMediumUIView AnimationI hope this article will help you with the introduction of various performance methods! If youIPhoneMediumUIView AnimationFor more information, see:

For details about how UIView animations are displayed on the iPhone, refer to the documentation)