在Swift中使用GLKit中的GLKMath [英] Using GLKMath from GLKit in Swift

问题描述

因此，我使用Ray Wenderlich的教程，使用一本名为iOS Games的书，并尝试利用在那里发现的一些Objective-C代码来使我的游戏作品中的角色的加速计控制成为可能。不过，我想用Swift来代替Objective-C。当我尝试创建一个代表3D矢量的GLKVector3类型的变量时遇到了一个问题。当我输入：

  var raw：GLKVector3 = GLKVector3Make（不相关的东西）
  
  
 
 
我得到以下错误：
 
 
使用模块GLKVector3作为类型。
 
 
 
我在GLKit的swift文件顶部有一个导入：
  import GLKit 
  
任何想法如何从GLKMath文件中获得用于我的程序的功能？ p> 
 
解决方案
 Swift在1.2版本中增加了union支持。即使使用 var 声明，导入的联合中的字段也是只读的，但可以根据需要传入和传出C函数。
 
 
 
 Swift 1.2的发行说明意味着这些字段可能根本不可访问，但至少对于 GLKit 类型，它们仍可读：
 
 
 Swift现在可以部分导入包含联合，位域，SIMD向量类型以及Swift中本机不支持的其他C语言功能的C聚合。不支持的字段将无法从Swift访问，但具有参数和这些类型的返回值的C和Objective-C API可以在Swift中使用。这包括Foundation  NSDecimal 类型和 GLKit GLKVector 和 GLKMatrix 类型等。
 
 
 
So I'm using a book called iOS Games by tutorials from Ray Wenderlich and trying to utilize some of the objective-C code found there to make the accelerometer control of a character in my game work. Instead of Objective-C though, I want to use Swift. I ran into an issue when trying to create a var of type GLKVector3, which represents a 3D vector. When I type in:
var raw:GLKVector3 = GLKVector3Make(irrelevant stuff)
I get the following error:

use of module GLKVector3 as type.

I have an import at the top of my swift file for GLKit:
import GLKit
Any ideas how I can get the functionality from the GLKMath files to use in my program?
解决方案
Swift has added union support in version 1.2. The fields in imported unions are read-only, even if declared with var, but can be passed to and from C functions as necessary.

The release notes for Swift 1.2 imply that the fields may not be accessible at all, but they are still readable for at least the GLKit types:

  
Swift can now partially import C aggregates containing unions, bitfields, SIMD vector types, and other C language features that are not natively supported in Swift. The unsupported fields will not be accessible from Swift, but C and Objective-C APIs that have arguments and return values of these types can be used in Swift. This includes the Foundation NSDecimal type and the GLKit GLKVector and GLKMatrix types, among others.


                        
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