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我创建了一个简单的 iPhone 应用程序，当用户第一次下载应用程序时，该应用程序有一个教程（一系列 5 张图像），他们可以单击下一步并循环浏览图像。目前没有办法再次播放教程，但在我的更新中，我想介绍这个功能，一些类似的应用程序在其应用程序本身的设置中。

我有一个Tab Bar与三个table view controllers Timeline，Event和Settings。当用户转到Settings tab并选择“Play Tutorial Again" Table View Cell,我希望它再次开始教程。

在我的Timeline视图（根视图）中，我有以下代码：

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];        
    if ([TutorialViewController hasSeenTutorial] == NO) {
    NSArray *tutorialImages = @[[UIImage imageNamed:@"Tutorial 1.png"],
                                        [UIImage imageNamed:@"Tutorial 2.png"],
                                        [UIImage imageNamed:@"Tutorial 3.png"],
                                        [UIImage imageNamed:@"Tutorial 4.png"],
                                        [UIImage imageNamed:@"Tutorial 5.png"]];
    TutorialViewController *tutorial = [[TutorialViewController alloc] initWithImages:tutorialImages];
    [self presentViewController:tutorial animated:YES completion:nil];
    [TutorialViewController setHasSeenTutorial:YES];
        }
}

- (void)displayTutorial
{

    NSArray *tutorialImages = @[[UIImage imageNamed:@"Tutorial 1.png"],
                                [UIImage imageNamed:@"Tutorial 2.png"],
                                [UIImage imageNamed:@"Tutorial 3.png"],
                                [UIImage imageNamed:@"Tutorial 4.png"],
                                [UIImage imageNamed:@"Tutorial 5.png"]];

    TutorialViewController *tutorial = [[TutorialViewController alloc] initWithImages:tutorialImages];
    [self presentViewController:tutorial animated:YES completion:nil];
}

TutorialViewController 的代码是：

static NSString * const kHasSeenTutorial = @"hasSeenTutorial";

+ (BOOL)hasSeenTutorial
{
    return [[NSUserDefaults standardUserDefaults] boolForKey:kHasSeenTutorial];
}

+ (void)setHasSeenTutorial:(BOOL)hasSeenTutorial
{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setBool:hasSeenTutorial forKey:kHasSeenTutorial];
    [defaults synchronize];
}

- (id)initWithImages:(NSArray *)imageArray
{
    self = [super init];
    if (self) {
        if (imageArray == nil) {
            [[NSException exceptionWithName:NSInvalidArgumentException reason:@"imageArray cannot be nil." userInfo:nil] raise];
        }
        self.images = imageArray;
    }
    return self;
}

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

- (void)viewDidLoad
{

    [super viewDidLoad];

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    [self.view addSubview:imageView];
    self.imageView = imageView;

    CGRect buttonFrame = [[UIScreen mainScreen] bounds];

        buttonFrame.origin.y = 519.0;
        buttonFrame.origin.x = 250.0;
        buttonFrame.size.height = 51.0;
        buttonFrame.size.width = 70.0;

        UIButton *nextButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

        [nextButton setTitle:@"Next" forState:UIControlStateNormal];
        [nextButton addTarget:self action:@selector(nextButtonWasTapped:) forControlEvents:UIControlEventTouchUpInside];

        nextButton.frame = buttonFrame;
        nextButton.backgroundColor = [UIColor whiteColor];

        nextButton.showsTouchWhenHighlighted = YES;
        nextButton.adjustsImageWhenHighlighted = NO;
        nextButton.tintColor = [UIColor purpleColor];
        nextButton.titleLabel.font = [UIFont systemFontOfSize:18.0];
        nextButton.opaque = NO;

        [self.view addSubview:nextButton];
        self.nextButton = nextButton;

        // ----------------------------------------------------------------------

        currentIndex = 0;

        if (self.images == nil) {
            self.images = @[];
        }


}

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

- (void)setImages:(NSArray *)images
{
    _images = images;
    [self resetToStart];
}

- (void)resetToStart
{
    [self.nextButton setTitle:@"Next" forState:UIControlStateNormal];
    currentIndex = 0;
    if (currentIndex < self.images.count) {
        self.imageView.image = self.images[currentIndex];
    }

    [self.view bringSubviewToFront:self.nextButton];
}

- (void)nextButtonWasTapped:(id)sender
{
    currentIndex++;
    if (currentIndex < self.images.count) {
        self.imageView.image = self.images[currentIndex];

        if (currentIndex == self.images.count - 1) {
            [self.nextButton setTitle:@"Start" forState:UIControlStateNormal];
        }
    }

    if (currentIndex == self.images.count) {
        [self dismissViewControllerAnimated:YES completion:nil];
        [EnvylopeTutorialViewController setHasSeenTutorial:YES];
    }
}

从它的外观来看，我猜我会做一些类似调用 ResetToStart 或类似的事情，但我真的不确定我会如何做到这一点。图像在时间轴中进行通信，但我正在从设置中播放教程，所以我猜我必须在设置表视图等中设置一些类似的方法。我真的迷失了这个

因此，从“设置”选项卡中，我希望能够通过单击“播放教程”表格视图单元格来使用相同的图像、按钮等重新播放教程。

在应用程序设置视图控制器中，我有：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    if ([cell.textLabel.text isEqualToString:@"Play Tutorial Again"])
    {
        NSLog(@"The Tutorial is going to play"); 
        [self displayTutorial]; 
    }


}

但是没有调用 displayTutorial 方法。

对此的任何指导将不胜感激。

4

1 回答 1

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只需在您的设置视图中调用您的Tutorial代码didSelectRow，省略hasSeenTutorial代码

将TutorialViewController *tutorial = [[TutorialViewController alloc] initWithImages:tutorialImages]; 您的didSelectRow方法放入您的 settingsViewController 以随时展示教程

于 2014-03-25T13:55:45.710 回答