iOS开发——UI篇OC&transform详解

transframe属性详解

1. transform属性

在OC中，通过transform属性可以修改对象的平移、缩放比例和旋转角度

常用的创建transform结构体方法分两大类

（1） 创建“基于控件初始位置”的形变

CGAffineTransformMakeTranslation（平移）

CGAffineTransformMakeScale（缩放）

CGAffineTransformMakeRotation（旋转）

（2） 创建“基于transform参数”的形变

CGAffineTransformTranslate

CGAffineTransformScale

CGAffineTransformRotate

补充：

在OC中，所有跟角度相关的数值，都是弧度值，180° = M_PI

正数表示顺时针旋转

负数表示逆时针旋转

/**

*  2D缩放

*/

     //起始位置：仅一次
     self.imageView2D.transform = CGAffineTransformMakeScale(, );
     //当前位置：多次
     self.imageView2D.transform = CGAffineTransformScale(self.imageView3D.transform, , );

/**

*  2D旋转

*/

     //起始位置：仅一次
     self.imageView2D.transform = CGAffineTransformMakeRotation(M_PI_4);
     //当前位置：多次;
     self.imageView2D.transform = CGAffineTransformRotate(self.imageView3D.transform, M_PI_4);

/**

*  2D平移

*/

     //起始位置：仅一次
     self.imageView2D.transform = CGAffineTransformMakeTranslation(, );
     //当前位置：多次
     self.imageView2D.transform = CGAffineTransformTranslate(self.imageView3D.transform, , );

/**

*  2D还原

*/

self.imageView2D.transform = CGAffineTransformIdentity;

其他：

 /**

 /* Invert `t' and return the result. If `t' has zero determinant, then `t'
    is returned unchanged. */

 CG_EXTERN CGAffineTransform CGAffineTransformInvert(CGAffineTransform t)
   CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

 /* Concatenate `t2' to `t1' and return the result:
      t' = t1 * t2 */

 CG_EXTERN CGAffineTransform CGAffineTransformConcat(CGAffineTransform t1,
   CGAffineTransform t2) CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);
 */

提示：由于transform属性可以基于控件的上一次的状态进行叠加形变，例如，先旋转再平移。因此在实际动画开发中，当涉及位置、尺寸形变效果时，大多修改控件的transform属性，而不是frame、bounds、center 。

2.代码示例

 //
 //  YYViewController.m
 //  01-练习使用按钮的frame和center属性
 //
 //  Created by apple on 14-5-21.
 //  Copyright (c) 2014年 itcase. All rights reserved.
 //

 #import "YYViewController.h"

 //私有扩展
 @interface YYViewController ()

 @property(nonatomic,weak)IBOutlet UIButton *headImageView;
 @end

 @implementation YYViewController

 //枚举类型，从1开始
 //枚举类型有一个很大的作用，就是用来代替程序中的魔法数字
 typedef enum
 {
     ktopbtntag=,
     kdownbtntag,
     krightbtntag,
     kleftbtntag
 }btntag;

 //viewDidLoad是视图加载完成后调用的方法，通常在此方法中执行视图控制器的初始化工作
 - (void)viewDidLoad
 {

     //在viewDidLoad方法中，不要忘记调用父类的方法实现
     [super viewDidLoad];

     //手写控件代码
     //一、写一个按钮控件，上面有一张图片

     //1.使用类创建一个按钮对象
    // UIButton *headbtn=[[UIButton alloc] initWithFrame:CGRectMake(100 ,100, 100, 100)];
     //设置按钮对象为自定义型
     UIButton *headbtn=[UIButton buttonWithType:UIButtonTypeCustom];

     //2.设置对象的各项属性

     //(1)位置等通用属性设置
     headbtn.frame=CGRectMake(, , , );

     //(2)设置普通状态下按钮的属性
     [headbtn setBackgroundImage:[UIImage imageNamed:@"i"] forState:UIControlStateNormal];
     [headbtn setTitle:@"点我！" forState:UIControlStateNormal];
     [headbtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

     //(3)设置高亮状态下按钮的属性
     [headbtn setBackgroundImage:[UIImage imageNamed:@"a"] forState:UIControlStateHighlighted];
     [headbtn setTitle:@"还行吧~" forState:UIControlStateHighlighted];
     [headbtn setTitleColor:[UIColor blueColor] forState:UIControlStateHighlighted];

     //3.把对象添加到视图中展现出来
     [self.view addSubview:headbtn];
     //注意点！
     self.headImageView=headbtn;

     //二、写四个控制图片左右上下移动方向的按钮控件

     /**================向上的按钮=====================*/
     //1.创建按钮对象
     UIButton *topbtn=[UIButton buttonWithType:UIButtonTypeCustom];

     //2.设置对象的属性
     topbtn.frame=CGRectMake(, , , );
     [topbtn setBackgroundImage:[UIImage imageNamed:@"top_normal"] forState:UIControlStateNormal];
     [topbtn setBackgroundImage:[UIImage imageNamed:@"top_highlighted"] forState:UIControlStateHighlighted];
     [topbtn setTag:];
     //3.把控件添加到视图中
     [self.view addSubview:topbtn];

     //4.按钮的单击控制事件
     [topbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];

       /**================向下的按钮=====================*/
     //1.创建按钮对象
     UIButton *downbtn=[UIButton buttonWithType:UIButtonTypeCustom];
     //2.设置对象的属性
     downbtn.frame=CGRectMake(, , , );
     [downbtn setBackgroundImage:[UIImage imageNamed:@"bottom_normal"] forState:UIControlStateNormal];
     [downbtn setBackgroundImage:[UIImage imageNamed:@"bottom_highlighted"] forState:UIControlStateHighlighted];
     [downbtn setTag:];
     //3.把控件添加到视图中
     [self.view addSubview:downbtn];

     //4.按钮的单击控制事件
     [downbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];

      /**================向左的按钮=====================*/
     //1.创建按钮对象
     UIButton *leftbtn=[UIButton buttonWithType:UIButtonTypeCustom];
     //2.设置对象的属性
     leftbtn.frame=CGRectMake(, , , );
     [leftbtn setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];
     [leftbtn setBackgroundImage:[UIImage imageNamed:@"left_highlighted"] forState:UIControlStateHighlighted];
     [leftbtn setTag:];
     //3.把控件添加到视图中
     [self.view addSubview:leftbtn];

     //4.按钮的单击控制事件
     [leftbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];

     /**================向右的按钮=====================*/
     //1.创建按钮对象
     UIButton *rightbtn=[UIButton buttonWithType:UIButtonTypeCustom];
     //2.设置对象的属性
     rightbtn.frame=CGRectMake(, , , );
     [rightbtn setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];
     [rightbtn setBackgroundImage:[UIImage imageNamed:@"right_highlighted"] forState:UIControlStateHighlighted];
     [rightbtn setTag:];
     //3.把控件添加到视图中
     [self.view addSubview:rightbtn];

     //4.按钮的单击控制事件
     [rightbtn addTarget:self action:@selector(Click:) forControlEvents:UIControlEventTouchUpInside];

       //三、写两个缩放按钮
        /**================放大的按钮=====================*/
     //1.创建对象
     UIButton *plusbtn=[UIButton buttonWithType:UIButtonTypeCustom];
     //2.设置属性
     plusbtn.frame=CGRectMake(, , , );
     [plusbtn setBackgroundImage:[UIImage imageNamed:@"plus_normal"] forState:UIControlStateNormal];
     [plusbtn setBackgroundImage:[UIImage imageNamed:@"plus_highlighted"] forState:UIControlStateHighlighted];
     [plusbtn setTag:];
     //3.添加到视图
     [self.view addSubview:plusbtn];
     //4.单击事件
     [plusbtn addTarget:self action:@selector(Zoom:) forControlEvents:UIControlEventTouchUpInside];

     /**================缩小的按钮=====================*/
     UIButton *minusbtn=[UIButton buttonWithType:UIButtonTypeCustom];
     minusbtn.frame=CGRectMake(, , , );
     [minusbtn setBackgroundImage:[UIImage imageNamed:@"minus_normal"] forState:UIControlStateNormal];
     [minusbtn setBackgroundImage:[UIImage imageNamed:@"minus_highlighted"] forState:UIControlStateHighlighted];
     [minusbtn setTag:];
     [self.view addSubview:minusbtn];
     [minusbtn addTarget:self action:@selector(Zoom:) forControlEvents:UIControlEventTouchUpInside];

     /**================向左旋转按钮=====================*/
     UIButton *leftrotatebtn=[UIButton buttonWithType:UIButtonTypeCustom];
     [leftrotatebtn setFrame:CGRectMake(, , , )];
     [leftrotatebtn setBackgroundImage:[UIImage imageNamed:@"left_rotate_normal"] forState:UIControlStateNormal];
     [leftrotatebtn setBackgroundImage:[UIImage imageNamed:@"left_rotate_highlighted"] forState:UIControlStateHighlighted];
     [leftrotatebtn setTag:];
     [self.view addSubview:leftrotatebtn];
     [leftrotatebtn addTarget:self action:@selector(Rotate:) forControlEvents:UIControlEventTouchUpInside];

     /**================向右旋转按钮=====================*/
     UIButton *rightrotatebtn=[UIButton buttonWithType:UIButtonTypeCustom];
     [rightrotatebtn setFrame:CGRectMake(, , , )];
     [rightrotatebtn setBackgroundImage:[UIImage imageNamed:@"right_rotate_normal"] forState:UIControlStateNormal];
     [rightrotatebtn setBackgroundImage:[UIImage imageNamed:@"right_rotate_highlighted"] forState:UIControlStateHighlighted];
     [rightbtn setTag:];
     [self.view addSubview:rightrotatebtn];
     [rightrotatebtn addTarget:self action:@selector(Rotate:) forControlEvents:UIControlEventTouchUpInside];
 }

 //控制方向的多个按钮调用同一个方法
 -(void)Click:(UIButton *)button
 {

     //练习使用frame属性
     //CGRect frame=self.headImageView.frame;

     /**注意，这里如果控制位置的两个属性frame和center同时使用的话，会出现很好玩的效果，注意分析*/
     //练习使用center属性
     CGPoint center=self.headImageView.center;
     switch (button.tag) {
         case ktopbtntag:
             center.y-=;
             break;
         case kdownbtntag:
             center.y+=;
             break;
         case kleftbtntag:
             //发现一个bug,之前的问题是因为少写了break,造成了它们的顺序执行，sorry
            //center.x=center.x-30;
             center.x-=;
             break;
         case krightbtntag:
             center.x+=;
             break;
     }

  //  self.headImageView.frame=frame;

     //首尾式设置动画效果
     [UIView beginAnimations:nil context:nil];
     self.headImageView.center=center;
     //设置时间
     [UIView setAnimationDuration:2.0];
     [UIView commitAnimations];
     NSLog(@"移动!");

 }
 -(void)Zoom:(UIButton *)btn
 {
     //使用bounds，以中心点位原点进行缩放
     CGRect bounds = self.headImageView.bounds;
     if (btn.tag) {
         bounds.size.height+=;
         bounds.size.width+=;
     }
     else
     {
         bounds.size.height-=;
         bounds.size.width-=;
     }

     //设置首尾动画
     [UIView beginAnimations:nil context:nil];
     self.headImageView.bounds=bounds;
     [UIView setAnimationDuration:2.0];
     [UIView commitAnimations];
 }

 -(void)Rotate:(UIButton *)rotate
 {
     //位移（不累加）
     //self.headImageView.transform=CGAffineTransformMakeTranslation(50, 200);
     //缩放
     //self.headImageView.transform=CGAffineTransformMakeScale(1.2, 10);
     //在原有的基础上位移（是累加的）
     //self.headImageView.transform=CGAffineTransformTranslate(self.headImageView.transform, 50, 50);
     //在原有的基础上进行缩放
     //self.headImageView.transform=CGAffineTransformScale(self.headImageView.transform, 1.5, 1.6);

     //在原有的基础上进行旋转
     if (rotate.tag) {
         //旋转角度为1/pi，逆时针
         self.headImageView.transform=CGAffineTransformRotate(self.headImageView.transform, -M_1_PI);
     }
     else
     {
         //旋转的角度为pi/2，顺时针
     self.headImageView.transform=CGAffineTransformRotate(self.headImageView.transform, M_PI_2);
     }

 }
 @end

3.viewDidLoad

viewDidLoad是视图加载完成后调用的方法，通常在此方法中执行视图控制器的初始化工作

在viewDidLoad方法中，一定不要忘记调用父类的方法实现

[super viewDidLoad];

CATransform3D

/**

*  3D缩放

*/

     //起始位置：仅一次

     self.imageView3D.layer.transform = CATransform3DMakeScale(1.0, 0.8, 0.9);

     //当前位置：多次

     self.imageView3D.layer.transform = CATransform3DScale(self.imageView3D.layer.transform, 1.0, 0.8, 0.9);

/**

*  3D旋转

*/

     //起始位置：仅一次

     self.imageView3D.layer.transform = CATransform3DMakeRotation(M_PI/, 0.5, 0.8, 0.3);

     //当前位置：多次

     self.imageView3D.layer.transform = CATransform3DRotate(self.imageView3D.layer.transform, M_PI_2, , );

/**

*  3D平移

*/

     //起始位置：仅一次

     self.imageView3D.layer.transform = CATransform3DMakeTranslation(, , );

     //当前位置：多次

     self.imageView3D.layer.transform = CATransform3DTranslate(self.imageView3D.layer.transform, , , );

/**

*  3D

*/

     //起始位置：仅一次

     //    self.imageView3D.layer.transform = CATransform3DMakeAffineTransform(<#CGAffineTransform m#>);

     //    //当前位置：多次

     //    self.imageView3D.layer.transform = CATransform3DIsAffine(<#CATransform3D t#>)

 CATransform3D结构成员的意义。

 struct CATransform3D
 {
 CGFloat m11（x缩放）, m12（y切变）, m13（旋转）, m14（）;
 CGFloat m21（x切变）, m22（y缩放）, m23（）, m24（）;
 CGFloat m31（旋转）, m32（）, m33（）, m34（透视效果，要操作的这个对象要有旋转的角度，否则没有效果。正直/负值都有意义）;
 CGFloat m41（x平移）, m42（y平移）, m43（z平移）, m44（）;
 };
 ps:整体比例变换时，也就是m11==m22时，若m33>，图形整体缩小，若0<m33<，图形整体放大，若s<,发生关于原点的对称等比变换。
 （）空的地方以后补充。
 . CATransform3DMakeTranslation
 CATransform3DMakeTranslation(, , ) 创建了一个4*4的单位矩阵。
 . CATransform3DMakeRotation And CATransform3DRotate
 CATransform3DMakeRotation()
     _transformedLayer = [CALayer layer];
     _transformedLayer.frame = self.bounds;
     _transformedLayer.anchorPoint = CGPointMake(0.5f, 0.5f);
     CATransform3D sublayerTransform = CATransform3DIdentity;
     // Set perspective
     sublayerTransform.m34 = kPerspective;
     [_transformedLayer setSublayerTransform:sublayerTransform];

     [self.layer addSublayer:_transformedLayer];
     //init Sublayers
     CATransform3D t = CATransform3DMakeTranslation(, , );
     // take snapshot of the current view
     [_transformedLayer addSublayer:[self snapshot:t
                                          withView:_contentView
                                          isMasked:YES]];
     // 暂时先支持一个方向翻转
     RotateDirection direction = RotateFromBottom;
     if (YES || direction == RotateFromBottom)
     {
         CGFloat height = self.bounds.size.height;
         //CGFloat cubeSize = 100.0f;
         t = CATransform3DRotate(t, D2R(, , );【】
         t = CATransform3DTranslate(t, , height, );
         CALayer *subLayer = [self snapshot:t withView:view isMasked:YES];
         [_transformedLayer addSublayer:subLayer];
     }
     else
     {
     }

     _newContentView = view;

     [self animationCubeRotate:direction withDuration:duration];
 　　
 . 翻转的动画
 - (void)animationCubeRotate:(RotateDirection)direction
                withDuration:(float)duration
 {
     [CATransaction flush];
     CGFloat height = self.bounds.size.height;
     CABasicAnimation *rotation;
     // CABasicAnimation *translationX;    // 如果沿X轴翻转,则用不到这个变量.
     CABasicAnimation *translationY;    // 如果沿Y轴翻转,则用不到这个变量.
     CABasicAnimation *translationZ;
     CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
     animationGroup.delegate = self;
     animationGroup.duration = duration;

     if ( direction == RotateFromBottom )
     {
         // 创建(某方向)关键帧动画.
         translationY = [CABasicAnimation animationWithKeyPath:
                         @"sublayerTransform.translation.y"];
         translationY.toValue = [NSNumber numberWithFloat:-(height / )];【】
         rotation = [CABasicAnimation animationWithKeyPath:
                     @"sublayerTransform.rotation.x"];
         rotation.toValue = [NSNumber numberWithFloat:D2R(-90.0f)];
     }
     else if ( direction == RotateFromTop )
     {
     }

     // 处理Z轴
     translationZ = [CABasicAnimation animationWithKeyPath:
                     @"sublayerTransform.translation.z"];
     translationZ.toValue = [NSNumber numberWithFloat:height / ];【】
     animationGroup.animations =
         [NSArray arrayWithObjects: rotation, translationY, translationZ, nil];
     animationGroup.fillMode = kCAFillModeForwards;
     animationGroup.removedOnCompletion = NO;
     [_transformedLayer addAnimation:animationGroup forKey:kAnimationKey];
 }

高级使用：

透射投影：（矩阵相乘）

首先封装我们想要的功能

 CATransform3D CATransform3DMakePerspective(CGPoint center, float disZ)

 {

     CATransform3D transToCenter = CATransform3DMakeTranslation(-center.x, -center.y, );

     CATransform3D transBack = CATransform3DMakeTranslation(center.x, center.y, );

     CATransform3D scale = CATransform3DIdentity;

     scale.m34 = -1.0f/disZ;

     return CATransform3DConcat(CATransform3DConcat(transToCenter, scale), transBack);

 }

 CATransform3D CATransform3DPerspect(CATransform3D t, CGPoint center, float disZ)

 {

     return CATransform3DConcat(t, CATransform3DMakePerspective(center, disZ));

 }

那么使用起来就非常简单了：

     CATransform3D rotate = CATransform3DMakeRotation(M_PI/, , , );

     self.imageView3D.layer.transform = CATransform3DPerspect(rotate, CGPointMake(, ), );

 //    CATransform3D rotate = CATransform3DMakeRotation(M_PI/6, 0, 0, 1);

 //    self.imageView3D.layer.transform = CATransform3DPerspect(rotate, CGPointMake(0, 0), 200);

四张同样大小的图片围成一个框，让这个框动画旋转。

 CATransform3D move = CATransform3DMakeTranslation(, , );

 CATransform3D back = CATransform3DMakeTranslation(, , -);

 CATransform3D rotate0 = CATransform3DMakeRotation(-angle, , , );

 CATransform3D rotate1 = CATransform3DMakeRotation(M_PI_2-angle, , , );

 CATransform3D rotate2 = CATransform3DMakeRotation(M_PI_2*-angle, , , );

 CATransform3D rotate3 = CATransform3DMakeRotation(M_PI_2*-angle, , , );

 CATransform3D mat0 = CATransform3DConcat(CATransform3DConcat(move, rotate0), back);

 CATransform3D mat1 = CATransform3DConcat(CATransform3DConcat(move, rotate1), back);

 CATransform3D mat2 = CATransform3DConcat(CATransform3DConcat(move, rotate2), back);

 CATransform3D mat3 = CATransform3DConcat(CATransform3DConcat(move, rotate3), back);

 image0.layer.transform = CATransform3DPerspect(mat0, CGPointZero, );

 image1.layer.transform = CATransform3DPerspect(mat1, CGPointZero, );

 image2.layer.transform = CATransform3DPerspect(mat2, CGPointZero, );

 image3.layer.transform = CATransform3DPerspect(mat3, CGPointZero, );

普通界面的立体翻转效果

  * 1.732f;

 CATransform3D move = CATransform3DMakeTranslation(, , dis);

 CATransform3D back = CATransform3DMakeTranslation(, , -dis);

     CATransform3D rotate0 = CATransform3DMakeRotation(-angle, , , );

     CATransform3D rotate1 = CATransform3DMakeRotation(-angle + M_PI/, , );

 CATransform3D mat0 = CATransform3DConcat(CATransform3DConcat(move, rotate0), back);

 CATransform3D mat1 = CATransform3DConcat(CATransform3DConcat(move, rotate1), back);

 view0.layer.transform = CATransform3DPerspect(mat0, CGPointZero, );

 view1.layer.transform = CATransform3DPerspect(mat1, CGPointZero, );

本文需要一定的数学基础，特别是想要实现非常炫酷的效果，当然如果你只是想要实现简单的动画效果那么久没那么多要求了！