CATransform3D的使用以及各个参数的含义

1. 缩放

CABasicAnimation *theAnimation=[CABasicAnimation animationWithKeyPath:@"transform"];
    //x,y,z放大缩小倍数
    CATransform3D transform=CATransform3DMakeScale(0.5, 0.5, 1.0);
    NSValue *value=[NSValue valueWithCATransform3D:transform];
    [theAnimation setToValue:value];
    
    
    transform=CATransform3DMakeScale(1.0, 1.0, 1.0);
    value=[NSValue valueWithCATransform3D:transform];
    
    [theAnimation setAutoreverses:YES];  //原路返回的动画一遍
    [theAnimation setDuration:1.0];//执行动画的时间
    [theAnimation setRepeatCount:2];//执行动画的次数
    
    [layer addAnimation:theAnimation forKey:nil];

2.动画旋转

CABasicAnimation *theAnimation=[CABasicAnimation animationWithKeyPath:@"transform"];
    CATransform3D transform=CATransform3DMakeRotation(90*M_PI/180, 1, 1, 0);//
    NSValue *value = [NSValue valueWithCATransform3D:transform];
    [theAnimation setToValue:value];

   /*
     angle：旋转的弧度，所以要把角度转换成弧度：角度 * M_PI / 180。
     
     x：向X轴方向旋转。值范围-1 --- 1之间
     
     y：向Y轴方向旋转。值范围-1 --- 1之间
     
     z：向Z轴方向旋转。值范围-1 --- 1之间
     向 X轴，Y轴都旋转60度，就是沿着对角线旋转。
     */
    transform = CATransform3DMakeRotation(1, 1, 1, 0);
    value = [NSValue valueWithCATransform3D:transform];
    [theAnimation setFromValue:value];
    theAnimation.duration=2;
    theAnimation.autoreverses=YES;
    [layer addAnimation:theAnimation forKey:nil];

3.组动画

CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform"];

    CATransform3D rotateTransform = CATransform3DMakeRotation(1.57, 0, 0, -1);
    CATransform3D scaleTransform = CATransform3DMakeScale(2, 2, 2);
    //(CGFloat tx,CGFloat ty, CGFloat tz ,x,y,z轴的偏移量
    CATransform3D positionTransform = CATransform3DMakeTranslation(1, 200, 0); //位置移动
    CATransform3D combinedTransform =CATransform3DConcat(rotateTransform, scaleTransform); //Concat就是combine的意思
    combinedTransform = CATransform3DConcat(combinedTransform, positionTransform); //再combine一次把三个动作连起来
    
    [anim setFromValue:[NSValue valueWithCATransform3D:CATransform3DIdentity]]; //放在3D坐标系中最正的位置
    [anim setToValue:[NSValue valueWithCATransform3D:combinedTransform]];
    [anim setDuration:5.0f];
    
    [layer addAnimation:anim forKey:nil];
    
    [layer setTransform:combinedTransform];  //如果没有这句，layer执行完动画又会返回最初的state