Swift2 UI测试-等待元素出现 [英] Swift2 UI Test - Wait for Element to Appear

问题描述

我想暂停测试并等待元素出现在屏幕上，然后再继续.

I want to have a test pause and wait for an element to appear on screen before proceeding.

我看不出有什么好的方法可以为此创建期望并等待使用

I don't see a good way to create an expectation for this and wait using

public func waitForExpectationsWithTimeout(timeout: NSTimeInterval, handler: XCWaitCompletionHandler?)

我一直在使用的创建期望的方法

The method to create an expectation I have been using has been

public func expectationForPredicate(predicate: NSPredicate, evaluatedWithObject object: AnyObject, handler: XCPredicateExpectationHandler?) -> XCTestExpectation

但这需要一个已经存在的元素，而我想让测试等待不存在的元素.

But this takes an already existing element, whereas I would like to have the test wait for an element that does not yet exist.

有人知道最好的方法吗?

Does anyone know the best way to do this?

推荐答案

在expectationForPredicate(predicate: evaluatedWithObject: handler:)中，您没有给出实际的对象，而是给出了在视图层次结构中查找该对象的查询.因此，例如，这是一个有效的测试:

In expectationForPredicate(predicate: evaluatedWithObject: handler:) you don't give an actual object, but a query to find it in the view hierarchy. So, for example, this is a valid test:

let predicate = NSPredicate(format: "exists == 1")
let query = XCUIApplication().buttons["Button"]
expectationForPredicate(predicate, evaluatedWithObject: query, handler: nil)

waitForExpectationsWithTimeout(3, handler: nil)

查看 UI测试备忘单和文档 a>由标题(目前没有任何官方文档)生成，全部由Joe Masilotti提供.

Check out UI Testing Cheat Sheet and documentation generated from the headers (there is no official documentation at the moment), all by Joe Masilotti.

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