我正在尝试将方法移出app委托，而是使用单独的视图控制器来符合协议。 旧的app代表是：
- (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动到InitialViewController，但按钮什么都不做？
@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
我目前的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CTRL拖动以生成InitialViewController根视图控制器。 CTRL-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，如果这样的话，我会真正生猪！
答案 0 :(得分：0)
有问题的代码似乎是https://github.com/rwarrender/DynamicQuestions
上列出的Github上的示例代码为了便于阅读，在app委托中发生了相当多的逻辑。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都已配置，因此app委托也是VRQuestionViewController委托。一旦问题得到解答，它就会回拨questionViewController:didAnswerQuestion:withResult:，其中应用代表将结果推送到调查问卷的答案列表中，然后沿着问题树移动以显示下一个问题。
正如Wain所建议的那样，如果你想将它扩展到一个不仅仅是一个例子，你可能会将app删除代码移动到控制器类中。您的初始视图控制器类出现问题，因为所有内容都包含在导航控制器中，因此您的导航控制器应该是故事板中的初始视图控制器，并将InitialViewController类作为根视图控制器。导航控制器。您可以通过右键单击从故事板中的导航控制器拖动到InitialViewController。
希望有所帮助！