如何将方法移出应用程序委托？

Question

我正在尝试将方法移出应用程序委托，而是使用单独的视图控制器来符合协议。 旧的应用程序委托是：

    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.qnaire = [[VRQuestionnaire alloc] initWithFile:[[NSBundle mainBundle] pathForResource:@"set1"
                                                                                        ofType:@"json"]];

    self.navController = (UINavigationController *)self.window.rootViewController;
    [self prepareForQuestion:self.qnaire.firstQuestion animated:NO];

    return YES;
}

/* Set up the question view controller with a question and push onto the nav stack
 */
- (void)prepareForQuestion:(VRQuestion *)question animated:(BOOL)animated;
{
    VRQuestionViewController *qvc = (VRQuestionViewController *)[self.navController.storyboard instantiateViewControllerWithIdentifier:@"QuestionViewController"];
    qvc.delegate = self;

    qvc.question = question;
    [self.navController pushViewController:qvc animated:animated];
}

/* Delegate that gets called every time a question is answered. This loads the next question and pushes it onto the nav stack.
 It also pushes a pointer to the question and result to a linked-list called firstAnswer->nextAnswer->nextAnswer, etc.

 When the next question returns nil we know we've finished as there are no more questions and log linked-list to console.
 */
- (void)questionViewController:(VRQuestionViewController *)controller didAnswerQuestion:(VRQuestion *)question withResult:(BOOL)result
{
    VRQuestion *nextQuestion = nil;

    if (result == YES) {
        nextQuestion = question.nextYesQuestion;
    } else if (result == NO) {
        nextQuestion = question.nextNoQuestion;
    }
    [self.qnaire pushAnswerResult:result forQuestion:question];

    // Handle no more questions
    if(nextQuestion) {
        [self prepareForQuestion:nextQuestion animated:YES];

    } else {
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Complete"
                                                            message:@"You completed the questionnaire"
                                                           delegate:nil
                                                  cancelButtonTitle:@"OK"
                                                  otherButtonTitles:nil];
        [alertView show];
        [self.qnaire logAnswers];
    }
}

我正在尝试将这些方法移至 InitialViewController ，但按钮什么也不做？

@implementation InitialViewController
- (IBAction)buttonPress:(UIButton *)sender {

    self.qnaire = [[VRQuestionnaire alloc] initWithFile:[[NSBundle mainBundle] pathForResource:@"set1"
                                                                                        ofType:@"json"]];
    //self.navController = (UINavigationController *)self.window.rootViewController;
    [self prepareForQuestion:self.qnaire.firstQuestion animated:NO];

}

提前致谢。

InitialViewController 按钮应调用 VRQuestionViewController（如下所示）

@interface VRQuestionViewController ()

@end

@implementation VRQuestionViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

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


    self.label.text = self.question.text;
    self.title = [self.question.identifier uppercaseString];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)yesPressed:(id)sender
{
    if (self.delegate != nil) {
        if ([self.delegate respondsToSelector:@selector(questionViewController:didAnswerQuestion:withResult:)]) {
            [self.delegate questionViewController:self didAnswerQuestion:self.question withResult:YES];
        }
    }
}

- (IBAction)noPressed:(id)sender
{
    if (self.delegate != nil) {
        if ([self.delegate respondsToSelector:@selector(questionViewController:didAnswerQuestion:withResult:)]) {
            [self.delegate questionViewController:self didAnswerQuestion:self.question withResult:NO];
        }
    }
}

@end

---

我当前的 AppDelegate：

#import <UIKit/UIKit.h>
#import "VRQuestionnaire.h"
#import "VRQuestionViewController.h"

@interface VRAppDelegate : UIResponder <UIApplicationDelegate>


@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) VRQuestionnaire *qnaire;


@end



#import "VRAppDelegate.h"
#import "VRQuestionViewController.h"

@implementation VRAppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    self.qnaire = [[VRQuestionnaire alloc] initWithFile:[[NSBundle mainBundle] pathForResource:@"set1"
                                                                                        ofType:@"json"]];


    return YES;
}

和 InitialViewController：

#import "VRAppDelegate.h"
#import "VRQuestionViewController.h"

@implementation VRAppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    self.qnaire = [[VRQuestionnaire alloc] initWithFile:[[NSBundle mainBundle] pathForResource:@"set1"
                                                                                        ofType:@"json"]];


    return YES;
}

#import "InitialViewController.h"

@interface InitialViewController ()

@end

@implementation InitialViewController
- (IBAction)buttonPress:(UIButton *)sender {

    self.qnaire = [[VRQuestionnaire alloc] initWithFile:[[NSBundle mainBundle] pathForResource:@"set1"
                                                                                        ofType:@"json"]];

    self.navController = (UINavigationController *)self.window.rootViewController;

    [self prepareForQuestion:self.qnaire.firstQuestion animated:NO];


}



/* Set up the question view controller with a question and push onto the nav stack
 */
- (void)prepareForQuestion:(VRQuestion *)question animated:(BOOL)animated;
{
    VRQuestionViewController *qvc = (VRQuestionViewController *)[self.navController.storyboard instantiateViewControllerWithIdentifier:@"QuestionViewController"];
    qvc.delegate = self;

    qvc.question = question;
    [self.navController pushViewController:qvc animated:animated];
}

/* Delegate that gets called every time a question is answered. This loads the next question and pushes it onto the nav stack.
 It also pushes a pointer to the question and result to a linked-list called firstAnswer->nextAnswer->nextAnswer, etc.

 When the next question returns nil we know we've finished as there are no more questions and log linked-list to console.
 */
- (void)questionViewController:(VRQuestionViewController *)controller didAnswerQuestion:(VRQuestion *)question withResult:(BOOL)result
{
    VRQuestion *nextQuestion = nil;

    if (result == YES) {
        nextQuestion = question.nextYesQuestion;
    } else if (result == NO) {
        nextQuestion = question.nextNoQuestion;
    }
    [self.qnaire pushAnswerResult:result forQuestion:question];

    // Handle no more questions
    if(nextQuestion) {
        [self prepareForQuestion:nextQuestion animated:YES];

    } else {
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Complete"
                                                            message:@"You completed the questionnaire"
                                                           delegate:nil
                                                  cancelButtonTitle:@"OK"
                                                  otherButtonTitles:nil];
        [alertView show];
        [self.qnaire logAnswers];
    }
}



- (void)viewDidLoad {
    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

从导航控制器按住 CTRL 并拖动以创建 InitialViewController 根视图控制器。 按住 CTRL 键从按钮拖动到 VRQuestionViewController。

在模拟器中按下按钮 VRQuestionViewController 时显示没有问题或对 Y/N 的响应

对不起，如果这样，我会做一个真正的猪耳朵！

Answer 1

有问题的代码似乎是 Github 上 https://github.com/rwarrender/DynamicQuestions 列出的示例代码

为了可读性，相当多的逻辑发生在应用程序委托中。应用程序委托初始化VRQuestionnaire 实例并设置问题。然后它在导航控制器上设置第一个问题视图控制器。每个VRQuestionViewController 都进行了配置，因此应用程序委托也是VRQuestionViewControllers 委托。回答完一个问题后，它会回调 questionViewController:didAnswerQuestion:withResult:，应用程序代表将结果推送到问卷的答案列表中，然后沿着问题树移动以显示下一个问题。

正如 Wain 所建议的，如果您想将其扩展为不止一个示例，您可能会将应用删除代码移动到控制器类中。您的初始视图控制器类有问题，因为所有内容都包装在导航控制器中，因此您的导航控制器应该是故事板中的初始视图控制器，InitialViewController 类作为导航控制器的根视图控制器。您可以通过右键单击从故事板中的导航控制器拖动到InitialViewController 来执行此操作。

希望有帮助！