NISnapshotRotation Class Reference

Overview

The NISnapshotRotation class provides support for implementing snapshot-based rotations on views.

You must call this object's rotation methods from your controller in order for the rotation object to implement the rotation animations correctly.

Inheritance diagram for NISnapshotRotation:

Tasks
Accessing the Delegate
id< NISnapshotRotationDelegate >	delegate property
Creating a Snapshot Rotation Object
(id)	- initWithDelegate:
Implementing UIViewController Autorotation
(void)	- willRotateToInterfaceOrientation:duration:
(void)	- willAnimateRotationToInterfaceOrientation:duration:
(void)	- didRotateFromInterfaceOrientation:

Method Documentation

delegate

The delegate of the snapshot rotation object.

@property (nonatomic, weak) id<NISnapshotRotationDelegate> delegate;

Discussion

The delegate must adopt the NISnapshotRotation protocol. The NISnapshotRotation class, which does not retain the delegate, invokes each protocol method the delegate implements.

initWithDelegate:

Initializes a newly allocated rotation object with a given delegate.

- (id)initWithDelegate:(id<NISnapshotRotationDelegate>)delegate;

Discussion

Parameters

delegate

A delegate that implements the NISnapshotRotation protocol.

Returns

A NISnapshotRotation object initialized with delegate.

willRotateToInterfaceOrientation:duration:

Prepares the animation for a rotation by taking a snapshot of the rotatingView in its current state.

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration;

Discussion

This method must be called from your UIViewController implementation.

willAnimateRotationToInterfaceOrientation:duration:

Crossfades between the initial and final snapshots.

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration;

Discussion

This method must be called from your UIViewController implementation.

didRotateFromInterfaceOrientation:

Finalizes the rotation animation by removing the snapshot views from the container view.

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation;

Discussion

This method must be called from your UIViewController implementation.