IOS开发 CGAffineTransform相关函数
2016-05-18 13:35
399 查看
CoreGraphics.h
CGAffineTransform rotation = CGAffineTransformMakeRotation(M_PI_2); [xxx setTransform:rotation]; 呵呵就这么简单的两行代码就可以实现了!
顺便记录一些常量,以后用的着!
#define M_E 2.71828182845904523536028747135266250 e #define M_LOG2E 1.44269504088896340735992468100189214 log 2e #define M_LOG10E 0.434294481903251827651128918916605082 log 10e #define M_LN2 0.693147180559945309417232121458176568 log
e2 #define M_LN10 2.30258509299404568401799145468436421 log e10 #define M_PI 3.14159265358979323846264338327950288 pi #define M_PI_2 1.57079632679489661923132169163975144 pi/2 #define M_PI_4 0.785398163397448309615660845819875721 pi/4 #define
M_1_PI 0.318309886183790671537767526745028724 1/pi #define M_2_PI 0.636619772367581343075535053490057448 2/pi #define M_2_SQRTPI 1.12837916709551257389615890312154517 2/sqrt(pi) #define M_SQRT2 1.41421356237309504880168872420969808 sqrt(2) #define
M_SQRT1_2 0.707106781186547524400844362104849039 1/sqrt(2)
from:http://donbe.blog.163.com/blog/static/138048021201061054243442/ CGAffineTransformMakeTranslation(width, 0.0);是改变位置的,
CGAffineTransformRotate(transform, M_PI);是旋转的。
CGAffineTransformMakeRotation(-M_PI);也是旋转的
transform = CGAffineTransformScale(transform, -1.0, 1.0);是缩放的。
view.transform = CGAffineTransformIdentity;线性代数里面讲的矩阵变换,这个是恒等变换 当 你改变过一个view.transform属性或者view.layer.transform的时候需要恢复默认状态的话,记得先把他们重置可以使用
view.transform = CGAffineTransformIdentity,
或者view.layer.transform = CATransform3DIdentity,
假设你一直不断的改变一个view.transform的属性,而每次改变之前没有重置的话,你会发现后来 的改变和你想要的发生变化了,不是你真正想要的结果
Quartz转换实现的原理:Quartz把绘图分成两个部分,
用户空间,即和设备无关,
设备空间,
用户空间和设备空间中间存在一个转换矩阵 : CTM
本章实质是讲解CTM
Quartz提供的3大功能
移动,旋转,缩放
演示如下,首先加载一张图片
void CGContextDrawImage (
CGContextRef c,
CGRect rect,
CGImageRef image
);
移动函数
CGContextTranslateCTM (myContext, 100, 50);
旋转函数
include <math.h>
static inline double radians (double degrees) {return degrees * M_PI/180;}
CGContextRotateCTM (myContext, radians(–45.));
缩放
CGContextScaleCTM (myContext, .5, .75);
翻转, 两种转换合成后的效果,先把图片移动到右上角,然后旋转180度
CGContextTranslateCTM (myContext, w,h);
CGContextRotateCTM (myContext, radians(-180.));
组合几个动作
CGContextTranslateCTM (myContext, w/4, 0);
CGContextScaleCTM (myContext, .25, .5);
CGContextRotateCTM (myContext, radians ( 22.));
CGContextRotateCTM (myContext, radians ( 22.));
CGContextScaleCTM (myContext, .25, .5);
CGContextTranslateCTM (myContext, w/4, 0);
上面是通过直接修改当前的ctm实现3大效果,下面是通过创建Affine Transforms,然后连接ctm实现同样的3种效果
这样做的好处是可以重用这个Affine Transforms
应用Affine Transforms 到ctm的函数
void CGContextConcatCTM (
CGContextRef c,
CGAffineTransform transform
);
Creating Affine Transforms
移动效果
CGAffineTransform CGAffineTransformMakeTranslation (
CGFloat tx,
CGFloat ty
);
CGAffineTransform CGAffineTransformTranslate (
CGAffineTransform t,
CGFloat tx,
CGFloat ty
);
旋转效果
CGAffineTransform CGAffineTransformMakeRotation (
CGFloat angle
);
CGAffineTransform CGAffineTransformRotate (
CGAffineTransform t,
CGFloat angle
);
缩放效果
CGAffineTransform CGAffineTransformMakeScale (
CGFloat sx,
CGFloat sy
);
CGAffineTransform CGAffineTransformScale (
CGAffineTransform t,
CGFloat sx,
CGFloat sy
);
反转效果
CGAffineTransform CGAffineTransformInvert (
CGAffineTransform t
);
只对局部产生效果
CGRect CGRectApplyAffineTransform (
CGRect rect,
CGAffineTransform t
);
判断两个AffineTrans是否相等
bool CGAffineTransformEqualToTransform (
CGAffineTransform t1,
CGAffineTransform t2
);
获得Affine Transform
CGAffineTransform CGContextGetUserSpaceToDeviceSpaceTransform (
CGContextRef c
);
下面的函数只起到查看的效果,比如看一下这个用户空间的点,转换到设备空间去坐标是多少
CGPoint CGContextConvertPointToDeviceSpace (
CGContextRef c,
CGPoint point
);
CGPoint CGContextConvertPointToUserSpace (
CGContextRef c,
CGPoint point
);
CGSize CGContextConvertSizeToDeviceSpace (
CGContextRef c,
CGSize size
);
CGSize CGContextConvertSizeToUserSpace (
CGContextRef c,
CGSize size
);
CGRect CGContextConvertRectToDeviceSpace (
CGContextRef c,
CGRect rect
);
CGRect CGContextConvertRectToUserSpace (
CGContextRef c,
CGRect rect
);
CTM真正的数学行为
这个转换矩阵其实是一个 3x3的 举证
如下图
下面举例说明几个转换运算的数学实现
x y 是原先点的坐标
下面是从用户坐标转换到设备坐标的计算公式
下面是一个identity matrix,就是输入什么坐标,出来什么坐标,没有转换
最终的计算结果是 x=x,y=y,
可以用函数判断这个矩阵是不是一个 identity matrix
bool CGAffineTransformIsIdentity (
CGAffineTransform t
);
参考:http://developer.apple.com/library/ios/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_affine/dq_affine.html
- (void)willAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
if (toInterfaceOrientation == UIInterfaceOrientationPortrait)
{
b=YES;
self.view=mainvv;
self.view.transform = CGAffineTransformIdentity;
self.view.transform = CGAffineTransformMakeRotation(degreesToRadian(0));
self.view.bounds = CGRectMake(0.0, 0.0, 768.0, 1004.0);
}
else if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft)
{
b=NO;
self.view = self.vv;
self.view.transform = CGAffineTransformIdentity;
self.view.transform = CGAffineTransformMakeRotation(degreesToRadian(-90));
self.view.bounds = CGRectMake(0.0, 0.0, 1024.0, 748.0);
}
else if (toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown)
{
b=YES;
self.view=mainvv;
self.view.transform = CGAffineTransformIdentity;
self.view.transform = CGAffineTransformMakeRotation(degreesToRadian(180));
self.view.bounds = CGRectMake(0.0, 0.0, 768.0, 1004.0);
}
else if (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight)
{
b=NO;
self.view = self.vv;
self.view.transform = CGAffineTransformIdentity;
self.view.transform = CGAffineTransformMakeRotation(degreesToRadian(90));
self.view.bounds = CGRectMake(0.0, 0.0, 1024.0, 748.0);
}
}
3
Quartz转换实现的原理:Quartz把绘图分成两个部分,
用户空间,即和设备无关,
设备空间,
用户空间和设备空间中间存在一个转换矩阵 : CTM
本章实质是讲解CTM
Quartz提供的3大功能
移动,旋转,缩放
演示如下,首先加载一张图片
void CGContextDrawImage (
CGContextRef c,
CGRect rect,
CGImageRef image
);
移动函数
CGContextTranslateCTM (myContext, 100, 50);
旋转函数
include <math.h>
static inline double radians (double degrees) {return degrees * M_PI/180;}
CGContextRotateCTM (myContext, radians(–45.));
缩放
CGContextScaleCTM (myContext, .5, .75);
翻转, 两种转换合成后的效果,先把图片移动到右上角,然后旋转180度
CGContextTranslateCTM (myContext, w,h);
CGContextRotateCTM (myContext, radians(-180.));
组合几个动作
CGContextTranslateCTM (myContext, w/4, 0);
CGContextScaleCTM (myContext, .25, .5);
CGContextRotateCTM (myContext, radians ( 22.));
CGContextRotateCTM (myContext, radians ( 22.));
CGContextScaleCTM (myContext, .25, .5);
CGContextTranslateCTM (myContext, w/4, 0);
上面是通过直接修改当前的ctm实现3大效果,下面是通过创建Affine Transforms,然后连接ctm实现同样的3种效果
这样做的好处是可以重用这个Affine Transforms
应用Affine Transforms 到ctm的函数
void CGContextConcatCTM (
CGContextRef c,
CGAffineTransform transform
);
Creating Affine Transforms
移动效果
CGAffineTransform CGAffineTransformMakeTranslation (
CGFloat tx,
CGFloat ty
);
CGAffineTransform CGAffineTransformTranslate (
CGAffineTransform t,
CGFloat tx,
CGFloat ty
);
旋转效果
CGAffineTransform CGAffineTransformMakeRotation (
CGFloat angle
);
CGAffineTransform CGAffineTransformRotate (
CGAffineTransform t,
CGFloat angle
);
缩放效果
CGAffineTransform CGAffineTransformMakeScale (
CGFloat sx,
CGFloat sy
);
CGAffineTransform CGAffineTransformScale (
CGAffineTransform t,
CGFloat sx,
CGFloat sy
);
反转效果
CGAffineTransform CGAffineTransformInvert (
CGAffineTransform t
);
只对局部产生效果
CGRect CGRectApplyAffineTransform (
CGRect rect,
CGAffineTransform t
);
判断两个AffineTrans是否相等
bool CGAffineTransformEqualToTransform (
CGAffineTransform t1,
CGAffineTransform t2
);
获得Affine Transform
CGAffineTransform CGContextGetUserSpaceToDeviceSpaceTransform (
CGContextRef c
);
下面的函数只起到查看的效果,比如看一下这个用户空间的点,转换到设备空间去坐标是多少
CGPoint CGContextConvertPointToDeviceSpace (
CGContextRef c,
CGPoint point
);
CGPoint CGContextConvertPointToUserSpace (
CGContextRef c,
CGPoint point
);
CGSize CGContextConvertSizeToDeviceSpace (
CGContextRef c,
CGSize size
);
CGSize CGContextConvertSizeToUserSpace (
CGContextRef c,
CGSize size
);
CGRect CGContextConvertRectToDeviceSpace (
CGContextRef c,
CGRect rect
);
CGRect CGContextConvertRectToUserSpace (
CGContextRef c,
CGRect rect
);
CTM真正的数学行为
这个转换矩阵其实是一个 3x3的 举证
如下图
下面举例说明几个转换运算的数学实现
x y 是原先点的坐标
下面是从用户坐标转换到设备坐标的计算公式
下面是一个identity matrix,就是输入什么坐标,出来什么坐标,没有转换
最终的计算结果是 x=x,y=y,
可以用函数判断这个矩阵是不是一个 identity matrix
bool CGAffineTransformIsIdentity (
CGAffineTransform t
);
移动矩阵
缩放矩阵
旋转矩阵
旋转加移动矩阵
//********************************//
CGAffineTransform rotation = CGAffineTransformMakeRotation(M_PI_2); [xxx setTransform:rotation]; 呵呵就这么简单的两行代码就可以实现了!
顺便记录一些常量,以后用的着!
#define M_E 2.71828182845904523536028747135266250 e #define M_LOG2E 1.44269504088896340735992468100189214 log 2e #define M_LOG10E 0.434294481903251827651128918916605082 log 10e #define M_LN2 0.693147180559945309417232121458176568 log
e2 #define M_LN10 2.30258509299404568401799145468436421 log e10 #define M_PI 3.14159265358979323846264338327950288 pi #define M_PI_2 1.57079632679489661923132169163975144 pi/2 #define M_PI_4 0.785398163397448309615660845819875721 pi/4 #define
M_1_PI 0.318309886183790671537767526745028724 1/pi #define M_2_PI 0.636619772367581343075535053490057448 2/pi #define M_2_SQRTPI 1.12837916709551257389615890312154517 2/sqrt(pi) #define M_SQRT2 1.41421356237309504880168872420969808 sqrt(2) #define
M_SQRT1_2 0.707106781186547524400844362104849039 1/sqrt(2)
from:http://donbe.blog.163.com/blog/static/138048021201061054243442/ CGAffineTransformMakeTranslation(width, 0.0);是改变位置的,
CGAffineTransformRotate(transform, M_PI);是旋转的。
CGAffineTransformMakeRotation(-M_PI);也是旋转的
transform = CGAffineTransformScale(transform, -1.0, 1.0);是缩放的。
view.transform = CGAffineTransformIdentity;线性代数里面讲的矩阵变换,这个是恒等变换 当 你改变过一个view.transform属性或者view.layer.transform的时候需要恢复默认状态的话,记得先把他们重置可以使用
view.transform = CGAffineTransformIdentity,
或者view.layer.transform = CATransform3DIdentity,
假设你一直不断的改变一个view.transform的属性,而每次改变之前没有重置的话,你会发现后来 的改变和你想要的发生变化了,不是你真正想要的结果
Quartz转换实现的原理:Quartz把绘图分成两个部分,
用户空间,即和设备无关,
设备空间,
用户空间和设备空间中间存在一个转换矩阵 : CTM
本章实质是讲解CTM
Quartz提供的3大功能
移动,旋转,缩放
演示如下,首先加载一张图片
void CGContextDrawImage (
CGContextRef c,
CGRect rect,
CGImageRef image
);
移动函数
CGContextTranslateCTM (myContext, 100, 50);
旋转函数
include <math.h>
static inline double radians (double degrees) {return degrees * M_PI/180;}
CGContextRotateCTM (myContext, radians(–45.));
缩放
CGContextScaleCTM (myContext, .5, .75);
翻转, 两种转换合成后的效果,先把图片移动到右上角,然后旋转180度
CGContextTranslateCTM (myContext, w,h);
CGContextRotateCTM (myContext, radians(-180.));
组合几个动作
CGContextTranslateCTM (myContext, w/4, 0);
CGContextScaleCTM (myContext, .25, .5);
CGContextRotateCTM (myContext, radians ( 22.));
CGContextRotateCTM (myContext, radians ( 22.));
CGContextScaleCTM (myContext, .25, .5);
CGContextTranslateCTM (myContext, w/4, 0);
上面是通过直接修改当前的ctm实现3大效果,下面是通过创建Affine Transforms,然后连接ctm实现同样的3种效果
这样做的好处是可以重用这个Affine Transforms
应用Affine Transforms 到ctm的函数
void CGContextConcatCTM (
CGContextRef c,
CGAffineTransform transform
);
Creating Affine Transforms
移动效果
CGAffineTransform CGAffineTransformMakeTranslation (
CGFloat tx,
CGFloat ty
);
CGAffineTransform CGAffineTransformTranslate (
CGAffineTransform t,
CGFloat tx,
CGFloat ty
);
旋转效果
CGAffineTransform CGAffineTransformMakeRotation (
CGFloat angle
);
CGAffineTransform CGAffineTransformRotate (
CGAffineTransform t,
CGFloat angle
);
缩放效果
CGAffineTransform CGAffineTransformMakeScale (
CGFloat sx,
CGFloat sy
);
CGAffineTransform CGAffineTransformScale (
CGAffineTransform t,
CGFloat sx,
CGFloat sy
);
反转效果
CGAffineTransform CGAffineTransformInvert (
CGAffineTransform t
);
只对局部产生效果
CGRect CGRectApplyAffineTransform (
CGRect rect,
CGAffineTransform t
);
判断两个AffineTrans是否相等
bool CGAffineTransformEqualToTransform (
CGAffineTransform t1,
CGAffineTransform t2
);
获得Affine Transform
CGAffineTransform CGContextGetUserSpaceToDeviceSpaceTransform (
CGContextRef c
);
下面的函数只起到查看的效果,比如看一下这个用户空间的点,转换到设备空间去坐标是多少
CGPoint CGContextConvertPointToDeviceSpace (
CGContextRef c,
CGPoint point
);
CGPoint CGContextConvertPointToUserSpace (
CGContextRef c,
CGPoint point
);
CGSize CGContextConvertSizeToDeviceSpace (
CGContextRef c,
CGSize size
);
CGSize CGContextConvertSizeToUserSpace (
CGContextRef c,
CGSize size
);
CGRect CGContextConvertRectToDeviceSpace (
CGContextRef c,
CGRect rect
);
CGRect CGContextConvertRectToUserSpace (
CGContextRef c,
CGRect rect
);
CTM真正的数学行为
这个转换矩阵其实是一个 3x3的 举证
如下图
下面举例说明几个转换运算的数学实现
x y 是原先点的坐标
下面是从用户坐标转换到设备坐标的计算公式
下面是一个identity matrix,就是输入什么坐标,出来什么坐标,没有转换
最终的计算结果是 x=x,y=y,
可以用函数判断这个矩阵是不是一个 identity matrix
bool CGAffineTransformIsIdentity (
CGAffineTransform t
);
参考:http://developer.apple.com/library/ios/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_affine/dq_affine.html
- (void)willAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
if (toInterfaceOrientation == UIInterfaceOrientationPortrait)
{
b=YES;
self.view=mainvv;
self.view.transform = CGAffineTransformIdentity;
self.view.transform = CGAffineTransformMakeRotation(degreesToRadian(0));
self.view.bounds = CGRectMake(0.0, 0.0, 768.0, 1004.0);
}
else if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft)
{
b=NO;
self.view = self.vv;
self.view.transform = CGAffineTransformIdentity;
self.view.transform = CGAffineTransformMakeRotation(degreesToRadian(-90));
self.view.bounds = CGRectMake(0.0, 0.0, 1024.0, 748.0);
}
else if (toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown)
{
b=YES;
self.view=mainvv;
self.view.transform = CGAffineTransformIdentity;
self.view.transform = CGAffineTransformMakeRotation(degreesToRadian(180));
self.view.bounds = CGRectMake(0.0, 0.0, 768.0, 1004.0);
}
else if (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight)
{
b=NO;
self.view = self.vv;
self.view.transform = CGAffineTransformIdentity;
self.view.transform = CGAffineTransformMakeRotation(degreesToRadian(90));
self.view.bounds = CGRectMake(0.0, 0.0, 1024.0, 748.0);
}
}
3
Quartz转换实现的原理:Quartz把绘图分成两个部分,
用户空间,即和设备无关,
设备空间,
用户空间和设备空间中间存在一个转换矩阵 : CTM
本章实质是讲解CTM
Quartz提供的3大功能
移动,旋转,缩放
演示如下,首先加载一张图片
void CGContextDrawImage (
CGContextRef c,
CGRect rect,
CGImageRef image
);
移动函数
CGContextTranslateCTM (myContext, 100, 50);
旋转函数
include <math.h>
static inline double radians (double degrees) {return degrees * M_PI/180;}
CGContextRotateCTM (myContext, radians(–45.));
缩放
CGContextScaleCTM (myContext, .5, .75);
翻转, 两种转换合成后的效果,先把图片移动到右上角,然后旋转180度
CGContextTranslateCTM (myContext, w,h);
CGContextRotateCTM (myContext, radians(-180.));
组合几个动作
CGContextTranslateCTM (myContext, w/4, 0);
CGContextScaleCTM (myContext, .25, .5);
CGContextRotateCTM (myContext, radians ( 22.));
CGContextRotateCTM (myContext, radians ( 22.));
CGContextScaleCTM (myContext, .25, .5);
CGContextTranslateCTM (myContext, w/4, 0);
上面是通过直接修改当前的ctm实现3大效果,下面是通过创建Affine Transforms,然后连接ctm实现同样的3种效果
这样做的好处是可以重用这个Affine Transforms
应用Affine Transforms 到ctm的函数
void CGContextConcatCTM (
CGContextRef c,
CGAffineTransform transform
);
Creating Affine Transforms
移动效果
CGAffineTransform CGAffineTransformMakeTranslation (
CGFloat tx,
CGFloat ty
);
CGAffineTransform CGAffineTransformTranslate (
CGAffineTransform t,
CGFloat tx,
CGFloat ty
);
旋转效果
CGAffineTransform CGAffineTransformMakeRotation (
CGFloat angle
);
CGAffineTransform CGAffineTransformRotate (
CGAffineTransform t,
CGFloat angle
);
缩放效果
CGAffineTransform CGAffineTransformMakeScale (
CGFloat sx,
CGFloat sy
);
CGAffineTransform CGAffineTransformScale (
CGAffineTransform t,
CGFloat sx,
CGFloat sy
);
反转效果
CGAffineTransform CGAffineTransformInvert (
CGAffineTransform t
);
只对局部产生效果
CGRect CGRectApplyAffineTransform (
CGRect rect,
CGAffineTransform t
);
判断两个AffineTrans是否相等
bool CGAffineTransformEqualToTransform (
CGAffineTransform t1,
CGAffineTransform t2
);
获得Affine Transform
CGAffineTransform CGContextGetUserSpaceToDeviceSpaceTransform (
CGContextRef c
);
下面的函数只起到查看的效果,比如看一下这个用户空间的点,转换到设备空间去坐标是多少
CGPoint CGContextConvertPointToDeviceSpace (
CGContextRef c,
CGPoint point
);
CGPoint CGContextConvertPointToUserSpace (
CGContextRef c,
CGPoint point
);
CGSize CGContextConvertSizeToDeviceSpace (
CGContextRef c,
CGSize size
);
CGSize CGContextConvertSizeToUserSpace (
CGContextRef c,
CGSize size
);
CGRect CGContextConvertRectToDeviceSpace (
CGContextRef c,
CGRect rect
);
CGRect CGContextConvertRectToUserSpace (
CGContextRef c,
CGRect rect
);
CTM真正的数学行为
这个转换矩阵其实是一个 3x3的 举证
如下图
下面举例说明几个转换运算的数学实现
x y 是原先点的坐标
下面是从用户坐标转换到设备坐标的计算公式
下面是一个identity matrix,就是输入什么坐标,出来什么坐标,没有转换
最终的计算结果是 x=x,y=y,
可以用函数判断这个矩阵是不是一个 identity matrix
bool CGAffineTransformIsIdentity (
CGAffineTransform t
);
移动矩阵
缩放矩阵
旋转矩阵
旋转加移动矩阵
//********************************//
layer 动画-(transform.rotation篇)
x轴旋转: CABasicAnimation *theAnimation; theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.rotation.x"]; theAnimation.duration=8; theAnimation.removedOnCompletion = YES; theAnimation.fromValue = [NSNumber numberWithFloat:0]; theAnimation.toValue = [NSNumber numberWithFloat:3.1415926]; [yourView.layer addAnimation:theAnimation forKey:@"animateTransform"]; y轴旋转: CABasicAnimation *theAnimation; theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.rotation.y"]; theAnimation.duration=8; theAnimation.removedOnCompletion = YES; theAnimation.fromValue = [NSNumber numberWithFloat:0]; theAnimation.toValue = [NSNumber numberWithFloat:3.1415926]; [yourView.layer addAnimation:theAnimation forKey:@"animateTransform"]; z轴旋转: CABasicAnimation *theAnimation; theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; theAnimation.duration=8; theAnimation.removedOnCompletion = YES; theAnimation.fromValue = [NSNumber numberWithFloat:0]; theAnimation.toValue = [NSNumber numberWithFloat:3.1415926]; [yourView.layer addAnimation:theAnimation forKey:@"animateTransform"]; 以上缩放是以view的中心点为中心缩放的,如果需要自定义缩放点,可以设置卯点: //中心点 [yourView.layer setAnchorPoint:CGPointMake(0.5, 0.5)]; //左上角 [yourView.layer setAnchorPoint:CGPointMake(0, 0)]; //右下角 [yourView.layer setAnchorPoint:CGPointMake(1, 1)]; 可设参数: theAnimation.repeatCount = 0; theAnimation.autoreverses = NO; 旋转的另一种实现:(以下代码绕z轴旋转180度) [self.topViewController.view.layer setAnchorPoint:CGPointMake(0.5, 0.5)]; [self.topViewController.view.layer setTransform:CATransform3DMakeRotation(0, 0, 0, 1)]; [UIView animateWithDuration:8 delay:0.0f options:UIViewAnimationOptionAllowUserInteraction | UIViewAnimationCurveEaseIn animations:^{ [self.topViewController.view.layer setTransform:CATransform3DMakeRotation(3.1415926, 0, 0, 1)]; } completion:^(BOOL finished) { }];
//获取当前transform CGAffineTransform transform = self.lblSeg.transform; //缩放 self.lblSeg.transform = CGAffineTransformMakeScale(.5, .5); //在一个transform的基础上再缩放 self.lblTest.transform = CGAffineTransformScale(transform, 0.5, 0.5); //旋转(弧度制) self.lblSeg.transform = CGAffineTransformMakeRotation(M_2_PI); //在一个transform的基础上再旋转 self.lblTest.transform = CGAffineTransformRotate(transform,M_2_PI); //平移 self.lblSeg.transform = CGAffineTransformMakeTranslation(100, 100); //在一个transform的基础上再平移 self.lblTest.transform = CGAffineTransformTranslate(transform, 100, 100);
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