Swift iOS - 在使用 CATransform3D .m34 属性 改变视角时对变换应用额外的改变 Swift

Question

我正在看一本关于动画的书iOS Core Animation: Advanced Techniques. The book is in Objective C. I'm not fluent in Objective C. I understand what the .m34 property does but when I apply the book's code to Swift the perspective isn't changing. The problem is I cannot seem to add to an existing transform like 。

我的代码：

var tranform = CATransform3DIdentiy
transfrom.m34 = -1 / 500
transform = CATransform3DMakerotation(CGFloat(Double.pi/4), 0, 1, 0) // this is just creating a new transform instead of adding to the existing one
viewIwantTransformed.layer.transfrom = transform

书籍代码：

@implementation ViewController 
- (void) viewDidLoad 

 { [super viewDidLoad]; 

   // create a new transform CATransform3D 
   transform = CATransform3DIdentity;

   // apply perspective 
   transform.m34 = - 1.0 / 500.0; 

  // rotate by 45 degrees along the Y axis
  transform = CATransform3DRotate( transform, M_PI_4, 0, 1, 0);

  // apply to layer 
  self.viewIwantTransformed.layer.transform = transform; 

} @end

结果

Answer 1

试试这个

transform = CATransform3DRotate(transform, M_PI_4, 0, 1, 0) 

改为

transform = CATransform3DMakerotation(CGFloat(Double.pi/4, 0, 1, 0)