我的iOS UI测试具有以下测试助手功能：
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."
如果我在测试失败时在测试中设置一个断点，然后手动调用valueForKey("hasKeyboardFocus")焦点和非焦点字段，那么我似乎会得到正确的行为：
(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
是否有可能做valueForKey一个XCUIElement工作，NSPredicate在UI测试？还有另一种优雅的方法可以做到这一点吗？
看来您的谓词略有偏离。尝试将其更改为以下内容：
NSPredicate(format: "hasKeyboardFocus == true"), evaluatedWithObject:element, handler: nil)
valueForKey创建谓词时，您无需传递零件。
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我来说两句