如何调整iOS选择器轮以生成随机索引

使用XCode UI Test我们可以通过任何方式调整iOS选择器轮子以生成索引值或获取索引值的文本并调整选择器轮。 我能够使用下面的代码获取索引值。 但无法获得索引值的值。

let picker = app.pickerWheels.element(boundBy: 1).otherElements.count print(picker) let randomNumber = arc4random_uniform((UInt32(picker))) print(randomNumber) 

使用拣选轮的计数我从中生成一个随机值。 使用randomNumber的索引号我试图获取值。 有什么方法可以获得索引的值并将选择器轮调整到该值。

Answer 1

这就是我在XCTest UI测试框架中处理选择器的方法。

我有一个对象（ PickerState ），它可以表示一个选择器轮的状态，它使用选择器轮的值填充，其格式为"Some value, 4 of 5" 。 getPickerState方法将值String转换为PickerState对象。

generateRandomNewPickerPosition为要移动的选择器生成随机索引，确保不返回选择器的当前位置。

然后我使用XCUIElement上的扩展方法移动到changePickerSelection中随机生成的值。

 /// Object to represent the state of a picker wheel. class PickerState { let selectedValue: String let currentPosition: UInt let maximumPosition: UInt init(selectedValue: String, currentPosition: UInt, maximumPosition: UInt) { self.selectedValue = selectedValue self.currentPosition = currentPosition self.maximumPosition = maximumPosition } } /// Retrieve a PickerState object, given the value of a picker wheel. func getPickerState(_ text: String) { // Separate value let splitText = text.componentsSeparatedByString(",") let selectedValue = splitText[0] // Extract numbers var numbers = splitText[1].componentsSeparatedByCharactersInSet(NSCharacterSet.decimalDigitCharacterSet().invertedSet) numbers = numbers.filter { $0 != "" } let currentPosition = UInt(numbers[0])! let maximumPosition = UInt(numbers[1])! return PickerState(selectedValue: selectedValue, currentPosition: currentPosition, maximumPosition: maximumPosition) } /// Generate a new position (1-indexed) for the picker. func generateRandomNewPickerPosition(pickerState: PickerState) -> UInt { let valueCount = pickerState.maximumPosition let random = UInt(arc4random_uniform(UInt32(valueCount - 1))) let newPosition = ((pickerState.currentPosition + random) % valueCount) + 1 return newPosition } /// Move up/down the picker options until the given `selectionPosition` is reached. func changePickerSelection(pickerWheel: XCUIElement, selectionPosition: UInt) { // Select the new value var valueSelected = false while !valueSelected { // Get the picker wheel's current position if let pickerValue = pickerWheel.value { let currentPosition = UInt(getPickerState(String(pickerValue)).currentPosition) switch currentPosition.compared(to: selectionPosition) { case .GreaterThan: pickerWheel.selectPreviousOption() case .LessThan: pickerWheel.selectNextOption() case .Equal: valueSelected = true } } } } /// Extend XCUIElement to contain methods for moving to the next/previous value of a picker. extension XCUIElement { /// Scrolls a picker wheel up by one option. func selectNextOption() { let startCoord = self.coordinateWithNormalizedOffset(CGVector(dx: 0.5, dy: 0.5)) let endCoord = startCoord.coordinateWithOffset(CGVector(dx: 0.0, dy: 30.0)) endCoord.tap() } /// Scrolls a picker wheel down by one option. func selectPreviousOption() { let startCoord = self.coordinateWithNormalizedOffset(CGVector(dx: 0.5, dy: 0.5)) let endCoord = startCoord.coordinateWithOffset(CGVector(dx: 0.0, dy: -30.0)) endCoord.tap() } } let pickerWheel = app.pickerWheels.element(boundBy: 0) let newPosition = generateRandomNewPickerPosition(getPickerState(pickerWheel.value)) changePickerSelection(pickerWheel, selectionPosition: newIndex)