无法在XCTest中从UIStoryboard转换自定义UIViewController

Question

在Swift,Xcode6-Beta5中,我试图对我的"ViewController"进行单元测试,而不是一个非常有创意的名字.

从查看其他回复,我想我没有正确配置我的"测试"目标.

测试代码失败:

  func testItShouldLoadFromStoryboard() {

    var storyBoard: UIStoryboard?
    var anyVC: AnyObject?
    var viewController: ViewController?
    var uiViewController: UIViewController?

    storyBoard = UIStoryboard(name:"Main", bundle: nil)
    XCTAssert(storyBoard != nil, "Test Not Configured Properly")

    anyVC = storyBoard?.instantiateInitialViewController()
    viewController = anyVC  as? ViewController
    // Failing Assertion 
    XCTAssert(viewController != nil, "Test Not Configured Properly")

    uiViewController = anyVC as? UIViewController
    XCTAssert(uiViewController != nil, "Test Not Configured Properly")

  }

我可以用以下几行强制演员:

anyVC = storyBoard?.instantiateInitialViewController()
viewController = (anyVC != nil) ? (anyVC  as ViewController) : nil

但这导致了以下崩溃:

libswiftCore.dylib`swift_dynamicCastClassUnconditional:
0x10724f5a0:  pushq  %rbp
0x10724f5a1:  movq   %rsp, %rbp
0x10724f5a4:  pushq  %r14
0x10724f5a6:  pushq  %rbx
0x10724f5a7:  movq   %rsi, %rbx
0x10724f5aa:  movq   %rdi, %r14
0x10724f5ad:  testq  %r14, %r14
0x10724f5b0:  je     0x10724f5de               ; swift_dynamicCastClassUnconditional + 62
0x10724f5b2:  movabsq $-0x7fffffffffffffff, %rax
0x10724f5bc:  andq   %r14, %rax
0x10724f5bf:  jne    0x10724f5de               ; swift_dynamicCastClassUnconditional + 62
0x10724f5c1:  movq   %r14, %rdi
0x10724f5c4:  callq  0x107279a6e               ; symbol stub for: object_getClass
0x10724f5c9:  nopl   (%rax)
0x10724f5d0:  cmpq   %rbx, %rax
0x10724f5d3:  je     0x10724f5ed               ; swift_dynamicCastClassUnconditional + 77
0x10724f5d5:  movq   0x8(%rax), %rax
0x10724f5d9:  testq  %rax, %rax
0x10724f5dc:  jne    0x10724f5d0               ; swift_dynamicCastClassUnconditional + 48
0x10724f5de:  leaq   0x3364d(%rip), %rax       ; "Swift dynamic cast failed"
0x10724f5e5:  movq   %rax, 0xa456c(%rip)       ; gCRAnnotations + 8
0x10724f5ec:  int3   
0x10724f5ed:  movq   %r14, %rax
0x10724f5f0:  popq   %rbx
0x10724f5f1:  popq   %r14
0x10724f5f3:  popq   %rbp
0x10724f5f4:  retq   
0x10724f5f5:  nopw   %cs:(%rax,%rax)

我还成功地直接实例化了ViewController,但是没有进行IBOutlet处理,这是我测试的目的之一,以确保我不会通过重命名事物来破坏链接,删除Storyboard编辑器中的连接,或者我发现的许多其他方法来破坏事物......

编辑----我从一个新项目开始,选择了iOS应用程序 - >单一视图应用程序模板.

将testExample替换为如下所示的代码,将ViewController添加到测试目标.类似的结果.此模板具有ViewController类型的单个视图控制器,故事板中没有其他内容.

  func testExample() {


      var storyBoard: UIStoryboard?
      var anyVC: AnyObject?
      var viewController: ViewController?

      storyBoard = UIStoryboard(name:"Main", bundle: nil)
      XCTAssert(storyBoard != nil, "Test Not Configured Properly")

      anyVC = storyBoard?.instantiateInitialViewController()
      viewController = anyVC as? ViewController
      XCTAssert(viewController != nil, "Test Not Configured Properly")

      // This is an example of a functional test case.
      XCTAssert(true, "Pass")

    }

在设置anyVC的值之后的断点处输出以下lldb:

(lldb) po anyVC
(instance_type = Builtin.RawPointer = 0x00007fe22c92a290 -> 0x000000010e20bd80 (void *)0x000000010e20bea0: OBJC_METACLASS_$__TtC22TestingViewControllers14ViewController)
 {
  instance_type = 0x00007fe22c92a290 -> 0x000000010e20bd80 (void *)0x000000010e20bea0: OBJC_METACLASS_$__TtC22TestingViewControllers14ViewController
} 

Answer 1

我提出了一个更好的解决方案,而不是公开一切.实际上,您只需要使用来自测试包的故事板而不是使用nil(强制它来自主目标的包).

var storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: NSBundle(forClass: self.dynamicType))
vc = storyboard.instantiateViewControllerWithIdentifier("LoginVC") as LoginViewController
vc.loadView()