iphone ios CABasicAnimation animationWithKeyPath 一些规定的值

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原文：
https://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/CoreAnimation_guide/Articles/KVCAdditions.html

Key Path Support for Structure Fields

CAAnimation

provides support for accessing the fields of selected structures using key paths. This is useful for specifying these structure fields as the key paths for animations,
as well as setting and getting values using

setValue:forKeyPath:

and

valueForKeyPath:

.

CATransform3D

exposes the following fields:

Structure Field	Description
rotation.x	The rotation, in radians, in the x axis.
rotation.y	The rotation, in radians, in the y axis.
rotation.z	The rotation, in radians, in the z axis.
rotation	The rotation, in radians, in the z axis. This is identical to setting the rotation.z field.
scale.x	Scale factor for the x axis.
scale.y	Scale factor for the y axis.
scale.z	Scale factor for the z axis.
scale	Average of all three scale factors.
translation.x	Translate in the x axis.
translation.y	Translate in the y axis.
translation.z	Translate in the z axis.
translation	Translate in the x and y axis. Value is an NSSize or CGSize.

CGPoint

exposes the following fields:

Structure Field	Description
x	The x component of the point.
y	The y component of the point.

CGSize

exposes the following fields:

Structure Field	Description
width	The width component of the size.
height	The height component of the size.

CGRect

exposes the following fields:

Structure Field	Description
origin	The origin of the rectangle as a CGPoint .
origin.x	The x component of the rectangle origin.
origin.y	The y component of the rectangle origin.
size	The size of the rectangle as a CGSize .
size.width	The width component of the rectangle size.
size.height	The height component of the rectangle size.

You can not specify a structure field key path using Objective-C 2.0 properties. This will not work:

myLayer.transform.rotation.x=0;

Instead you must use

setValue:forKeyPath:

or

valueForKeyPath:

as
shown below:

[myLayer setValue:[NSNumber numberWithInt:0] forKeyPath:@"transform.rotation.x"];