ios - 有没有办法在 UITest 中将 valueForKey 与 NSPredicate 一起使用？

Question

我的 iOS UI 测试有以下测试辅助函数:

func waitForElementToHaveKeyboardFocus(element: XCUIElement) {
    self.expectationForPredicate(NSPredicate(format:"valueForKey(\"hasKeyboardFocus\") == true"), evaluatedWithObject:element, handler: nil)
    self.waitForExpectationsWithTimeout(5, handler: nil)
}

在我的测试中，我有:

let usernameTextField = app.textFields["Username"]
let passwordTextField = app.secureTextFields["Password"]
waitForElementToHaveKeyboardFocus(usernameTextField)

测试失败并出现以下错误:

error: -[ExampleAppUITests.ExampleAppUITests testExampleApp] : failed: caught "NSUnknownKeyException", "[<_NSPredicateUtilities 0x10e554ee8> valueForUndefinedKey:]: this class is not key value coding-compliant for the key hasKeyboardFocus."

如果我在失败时在测试中设置断点，并在聚焦和未聚焦的字段上手动调用 valueForKey("hasKeyboardFocus") 我似乎得到了正确的行为:

(lldb) po usernameTextField.valueForKey("hasKeyboardFocus")
    t =    51.99s     Find the "Username" TextField
    t =    51.99s         Use cached accessibility hierarchy for ExampleApp
    t =    52.00s         Find: Descendants matching type TextField
    t =    52.01s         Find: Elements matching predicate '"Username" IN identifiers'
▿ Optional<AnyObject>
  - Some : 1

(lldb) po passwordTextField.valueForKey("hasKeyboardFocus")
    t =   569.99s     Find the "Password" SecureTextField
    t =   569.99s         Use cached accessibility hierarchy for ExampleApp
    t =   570.01s         Find: Descendants matching type SecureTextField
    t =   570.01s         Find: Elements matching predicate '"Password" IN identifiers'
▿ Optional<AnyObject>
  - Some : 0

是否可以在 UI 测试中使 XCUIElement 上的 valueForKey 与 NSPredicate 配合使用？还有另一种优雅的方式来做到这一点吗？

Answer 1

看起来你的谓词有点不对劲。尝试将其更改为以下内容:

NSPredicate(format: "hasKeyboardFocus == true"), evaluatedWithObject:element, handler: nil)

创建谓词时不需要传入valueForKey部分。