研究工具包 - Objective-C错误：“视觉同意步骤没有可见的场景”

Question

编辑：我终于解决了这个问题，它是缓存问题和缺少代码行的组合。我从未真正将任务添加到视图控制器，不知怎的，我错过了那一步。但是我运行github演示项目时也遇到了奇怪的错误，不得不重新启动并删除缓存目录以使Xcode正常运行。

我正在尝试在Objective-C中实现Research Kit。没有教程和很少的文档可以转向。我正在崩溃“视觉同意步骤没有可见的场景”。我有一个视图控制器，在该视图控制器上我有一个触发IBAction“consentTapped”的按钮。我试图改编Ray Wenderlich教程http://www.raywenderlich.com/104575/researchkit-tutorial-with-swift和这个GitHub项目：https://github.com/weberbry/ResearchKitConsentDemo

为了自己排除故障，我已将所有代码放在viewDidAppear中，将其从封装方法中取出，因为我认为我犯了这样的错误，但仍然存在问题：

这是我的代码：

#import "ViewController.h"
#import <ResearchKit/ResearchKit.h>

@interface ViewController ()<ORKTaskViewControllerDelegate>

@property (strong, nonatomic) ORKConsentDocument *consentDocument;
@property (strong, nonatomic) ORKOrderedTask *orderedTask;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];


    NSString *resource = [[NSBundle mainBundle] pathForResource:@"ConsentText" ofType:@"json"];
    NSData *consentData = [NSData dataWithContentsOfFile:resource];
    NSDictionary *parsedConsentData = [NSJSONSerialization JSONObjectWithData:consentData options:NSJSONReadingMutableContainers error:nil];

    NSArray *sectionDataParsedFromInputFile = [parsedConsentData objectForKey:@"sections"];


    NSMutableArray *consentSections = [NSMutableArray new];
    for (NSDictionary *sectionDictionary in sectionDataParsedFromInputFile) {


        ORKConsentSectionType sectionType = [[sectionDictionary objectForKey:@"sectionType"] integerValue];
        NSString *title = [sectionDictionary objectForKey:@"sectionTitle"];
        NSString *summary = [sectionDictionary objectForKey:@"sectionSummary"];
        NSString *detail = [sectionDictionary objectForKey:@"sectionDetail"];

        ORKConsentSection *section = [[ORKConsentSection alloc] initWithType:sectionType];
        section.title = title;
        section.summary = summary;
        section.htmlContent = detail;


        ORKConsentSection *consentSection = section;
        [consentSections addObject:consentSection];
    }


    ORKConsentSection *introSection = [[ORKConsentSection alloc] initWithType:ORKConsentSectionTypeOnlyInDocument];
    introSection.title = @"Intro Language";
    introSection.content = @"This will only be shown in the consent document because this sectionType is map to ORKConsentSectionTypeOnlyInDocument. A consent document can include many sections with type ORKConsentSectionTypeOnlyInDocument. In this document there is a ORKConsentSectionTypeOnlyInDocument section as an intro and one as a closing section";
    [consentSections insertObject:introSection atIndex:0];


    ORKConsentSection *closingSection = [[ORKConsentSection alloc] initWithType:ORKConsentSectionTypeOnlyInDocument];
    closingSection.title = @"Additional Terms";
    closingSection.htmlContent = @"Adding a ORKConsentSectionTypeOnlyInDocument at the end of a consent can be helpful to include any additional legal or related information.";
    [consentSections addObject:closingSection];


    self.consentDocument = [ORKConsentDocument new];
    self.consentDocument.title = @"Demo Consent";
    self.consentDocument.sections = consentSections;


    ORKConsentSignature *signature = [ORKConsentSignature new];
    self.consentDocument.signatures = [NSArray arrayWithObject:signature];


    ORKVisualConsentStep *visualConsentStep = [[ORKVisualConsentStep alloc] initWithIdentifier:@"visualConsentStep" document:self.consentDocument];


    ORKConsentReviewStep *consentReviewStep = [[ORKConsentReviewStep alloc] initWithIdentifier:@"consentReviewStep" signature:self.consentDocument.signatures.firstObject inDocument:self.consentDocument];
    consentReviewStep.text = @"Review Consent!";
    consentReviewStep.reasonForConsent = @"I confirm that I consent to join this study";

    self.orderedTask =  [[ORKOrderedTask alloc] initWithIdentifier:@"consent" steps:@[visualConsentStep, consentReviewStep]];

}

- (IBAction)consentTapped:(id)sender {

    ORKTaskViewController *taskViewController = [[ORKTaskViewController alloc]initWithTask:self.orderedTask taskRunUUID:nil];
    taskViewController.delegate = self;
    [self presentViewController:taskViewController animated:YES completion:nil];
}

- (void)taskViewController:(ORKTaskViewController *)taskViewController
       didFinishWithReason:(ORKTaskViewControllerFinishReason)reason
                     error:(NSError *)error {
    ORKTaskResult *taskResult = [taskViewController result];
    [self dismissViewControllerAnimated:YES completion:nil];
}

由于错误的措辞我觉得应该有另一个视图控制器场景但我没有在Ray Wenderlich教程中看到一个，除非我错过了它。我还不知道很快，所以如果你这样做，你发现我错过了什么，请告诉我。

当您离开viewDidAppear时发生崩溃。

这也是我在这里的第一篇文章，所以如果我没有遵循社区准则请告诉我，我会立即修改我的帖子。

编辑：这是工作代码。请记住，sudo删除DerivedData文件夹，如果除了我发布的原始错误之外还有奇怪的错误，请重新启动。缺少的行是“taskViewController.task = self.orderedTask;”

#import "ViewController.h"
#import <ResearchKit/ResearchKit.h>

@interface ViewController ()<ORKTaskViewControllerDelegate>

@property (strong, nonatomic) ORKConsentDocument *consentDocument;
@property (strong, nonatomic) ORKOrderedTask *orderedTask;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];


    NSString *resource = [[NSBundle mainBundle] pathForResource:@"ConsentText" ofType:@"json"];
    NSData *consentData = [NSData dataWithContentsOfFile:resource];
    NSDictionary *parsedConsentData = [NSJSONSerialization JSONObjectWithData:consentData options:NSJSONReadingMutableContainers error:nil];

    NSArray *sectionDataParsedFromInputFile = [parsedConsentData objectForKey:@"sections"];

    NSMutableArray *consentSections = [NSMutableArray new];
    for (NSDictionary *sectionDictionary in sectionDataParsedFromInputFile) {

        ORKConsentSectionType sectionType = [[sectionDictionary objectForKey:@"sectionType"] integerValue];
        NSString *title = [sectionDictionary objectForKey:@"sectionTitle"];
        NSString *summary = [sectionDictionary objectForKey:@"sectionSummary"];
        NSString *detail = [sectionDictionary objectForKey:@"sectionDetail"];

        ORKConsentSection *section = [[ORKConsentSection alloc] initWithType:sectionType];
        section.title = title;
        section.summary = summary;
        section.htmlContent = detail;

        ORKConsentSection *consentSection = section;
        [consentSections addObject:consentSection];
    }

    ORKConsentSection *introSection = [[ORKConsentSection alloc] initWithType:ORKConsentSectionTypeOnlyInDocument];
    introSection.title = @"Intro Language";
    introSection.htmlContent = @"This will only be shown in the consent document because this sectionType is map to ORKConsentSectionTypeOnlyInDocument. A consent document can include many sections with type ORKConsentSectionTypeOnlyInDocument. In this document there is a ORKConsentSectionTypeOnlyInDocument section as an intro and one as a closing section";

    [consentSections insertObject:introSection atIndex:0];


    ORKConsentSection *closingSection = [[ORKConsentSection alloc] initWithType:ORKConsentSectionTypeOnlyInDocument];
    closingSection.title = @"Additional Terms";
    closingSection.htmlContent = @"Adding a ORKConsentSectionTypeOnlyInDocument at the end of a consent can be helpful to include any additional legal or related information.";
    [consentSections addObject:closingSection];


    NSArray *sections = consentSections;


    self.consentDocument = [ORKConsentDocument new];
    self.consentDocument.title = @"Demo Consent";
    self.consentDocument.sections = consentSections;

    ORKConsentSignature *signature = [ORKConsentSignature new];
    self.consentDocument.signatures = [NSArray arrayWithObject:signature];


    ORKVisualConsentStep *visualConsentStep = [[ORKVisualConsentStep alloc] initWithIdentifier:@"visualConsentStep" document:self.consentDocument];


    ORKConsentReviewStep *consentReviewStep = [[ORKConsentReviewStep alloc] initWithIdentifier:@"consentReviewStep" signature:self.consentDocument.signatures.firstObject inDocument:self.consentDocument];
    consentReviewStep.text = @"Review Consent!";
    consentReviewStep.reasonForConsent = @"I confirm that I consent to join this study";


    self.orderedTask =  [[ORKOrderedTask alloc] initWithIdentifier:@"consent" steps:@[visualConsentStep, consentReviewStep]];

}

- (IBAction)consentTapped:(id)sender {

    ORKTaskViewController *taskViewController = [[ORKTaskViewController alloc] init];
    taskViewController.task = self.orderedTask;
    taskViewController.delegate = self;
    [self presentViewController:taskViewController animated:YES completion:nil];
}

- (void)taskViewController:(ORKTaskViewController *)taskViewController
       didFinishWithReason:(ORKTaskViewControllerFinishReason)reason
                     error:(NSError *)error {
    ORKTaskResult *taskResult = [taskViewController result];
    [self dismissViewControllerAnimated:YES completion:nil];
}

Answer 1

回答 Abbey Jackson ：

  

这是工作代码。请记住，sudo删除 DerivedData 文件夹，如果除了我发布的原始错误之外还有奇怪的错误，请重新启动。缺失的行是CustomTabs

taskViewController.task = self.orderedTask;