使用 ResearchKit 以编程方式呈现 ORKTaskViewController答案

【问题标题】：present ORKTaskViewController programmatically using ResearchKit使用 ResearchKit 以编程方式呈现 ORKTaskViewController
【发布时间】：2019-10-21 04:09:29
【问题描述】：

我从 GitHub 下载了latest release of ResearchKit 并将框架嵌入到我的项目中。

使用Ray Wenderlich Tutorial on ResearchKit，我创建了一个调查任务：

import ResearchKit

public var SurveyTask: ORKOrderedTask {

    var steps = [ORKStep]()

    let instructionStep = ORKInstructionStep(identifier: "IntroStep")
    instructionStep.title = "The Questions Three"
    instructionStep.text = "Who would cross the Bridge of Death must answer me these questions three, ere the other side they see."
    steps += [instructionStep]

    let nameAnswerFormat = ORKTextAnswerFormat(maximumLength: 20)
    nameAnswerFormat.multipleLines = false
    let nameQuestionStepTitle = "What is your name?"
    let nameQuestionStep = ORKQuestionStep(identifier: "QuestionStep", title: nameQuestionStepTitle, question: "Hello?", answer: nameAnswerFormat)
    steps += [nameQuestionStep]

    let questQuestionStepTitle = "What is your quest?"
    let textChoices = [
      ORKTextChoice(text: "Create a ResearchKit App", value: 0 as NSNumber),
      ORKTextChoice(text: "Seek the Holy Grail", value: 1 as NSNumber),
      ORKTextChoice(text: "Find a shrubbery", value: 2 as NSNumber)
    ]
    let questAnswerFormat: ORKTextChoiceAnswerFormat = ORKAnswerFormat.choiceAnswerFormat(with: .singleChoice, textChoices: textChoices)
    let questQuestionStep = ORKQuestionStep(identifier: "TextChoiceQuestionStep", title: questQuestionStepTitle, question: "Hello?", answer: questAnswerFormat)
    steps += [questQuestionStep]

    let summaryStep = ORKCompletionStep(identifier: "SummaryStep")
    summaryStep.title = "Right. Off you go!"
    summaryStep.text = "That was easy!"
    steps += [summaryStep]

    return ORKOrderedTask(identifier: "SurveyTask", steps: steps)
}

我的 ViewController 中的委托是这样设置的：

extension ViewController: ORKTaskViewControllerDelegate {

    func taskViewController(_ taskViewController: ORKTaskViewController, didFinishWith reason: ORKTaskViewControllerFinishReason, error: Error?) {
        taskViewController.dismiss(animated: true, completion: nil)
    }

}

然后在那个 ViewController 中，我尝试展示 ORKTaskViewController:

@objc func showSurvey() {
    let taskViewController = ORKTaskViewController(task: SurveyTask, taskRun: nil)
    taskViewController.delegate = self
    self.present(taskViewController, animated: true, completion: nil)
}

我不断收到libc++abi.dylib: terminating with uncaught exception of type NSException，但我不太清楚为什么。我没有使用故事板，但我不明白为什么没有故事板就不能使用 ResearchKit。我试图搜索没有情节提要的实现，但我能找到的最接近的是this，它仍然使用情节提要。任何帮助将不胜感激。

【问题讨论】：

标签： ios swift interface-builder researchkit

【解决方案1】：

添加异常断点后，发现与ResearchKit库中的_appTintColor有关。

ORKNavigationContainerView.m中的这行代码：

_appTintColor = [[UIApplication sharedApplication].delegate window].tintColor;

没有工作，我假设这是因为 SceneDelegate.swift 是在 iOS 13 中引入的，我在其中以编程方式设置窗口和根视图控制器（而不是在 AppDelegate 中进行）。

如果你把它改成这样：

if (@available(iOS 13.0, *)) {
    _appTintColor = [self window] .tintColor;
    // not sure if it's this or [[self window].windowScene windows].firstObject .tintColor;
} else {
    _appTintColor = [[UIApplication sharedApplication].delegate window].tintColor;
}

那么它应该可以工作。我对 Obj-c 不熟悉，但我试图获取实例化新视图控制器的视图窗口，它似乎可以工作（随意编辑）。

【讨论】：