Question

我正在尝试使用UIPageViewController进行应用演练。当应用程序启动时，我将显示演练的第一页，其中包含TextView。我滚动到下一个屏幕，这一切都很好，但是当我滚动回到第一个屏幕时，文本视图的字体大小已经改变。有趣的是，当我滚动到第四个屏幕的第三个，然后回到第一个屏幕时，文本保持（或者更确切地说）其先前的大小。

我尝试使用viewWillAppear和viewDidAppeard来改变字体大小，但是你可以看到字体大小的变化，这是一种丑陋和意想不到的变化。

我在iOS 9.0.1上运行，但是这个错误使我在iOS 8.0中开始忙碌，这是我开始开发应用程序的时候。

希望有人可以帮助我。

干杯

-------------更新：审查代码：PageViewController ----------

    - (void)viewDidLoad {
    [super viewDidLoad];

    self.pageController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];

    self.pageController.dataSource = self;
    [[self.pageController view] setFrame:[[self view] bounds]];

    childViewController = (TutorialChildViewController *)[self viewControllerAtIndex:1];
    tvController = (TutorialViewControllerTextViewController *)[self viewControllerAtIndex:0];

    NSArray *viewControllers = [NSArray arrayWithObject:tvController];

    UIPageControl *pageControl = [UIPageControl appearance];
    [self.pageController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];

    [self addChildViewController:self.pageController];
    [[self view] addSubview:[self.pageController view]];
    [self.pageController didMoveToParentViewController:self];


    - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {

    NSInteger index = 0;

    if ([viewController isKindOfClass:[TutorialChildViewController class]]) {
        index = [(TutorialChildViewController *)viewController indexNumber];

    }
    else if ([viewController isKindOfClass:[TutorialTextViewController class]]) {
        index = [(TutorialChildViewController *)viewController indexNumber];
    }


    if (index == 0) {       
        return nil;
        }
    index--;

    return [self viewControllerAtIndex:index];

}
    - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {

    NSInteger index = 0;
    if ([viewController isKindOfClass:[TutorialChildViewController class]]) {
        index = [(TutorialChildViewController *)viewController indexNumber];

    }
    else if ([viewController isKindOfClass:[TutorialTextViewController class]]) {
            index = [(TutorialTextViewController *)viewController indexNumber];
    }
         index++;

    if (index == 6) {

        return nil;

    }
    return [self viewControllerAtIndex:index];

    }

    - (UIViewController *)viewControllerAtIndex:(NSUInteger)index {

    TutorialImageViewController *viewController = [[TutorialImageViewController alloc] initWithNibName:@"TutorialImageViewController" bundle:nil];
    TutorialTextViewController *tvC = [[TutorialTextViewController alloc] initWithNibName:@"TutorialTextViewController" bundle:nil];


    switch(index) {

        case 0:
        case 5: {
            tvC.explanatoryText = [[UITextView alloc] init];
            [tvC.explanatoryText setFont:[UIFont fontWithName:@"Helvetica Neue" size:17.0]];

            tvC.indexNumber = index;
            return tvC;
        }
            break;


        case 1:
        case 2:
        case 3:
        case 4: {
                viewController.preview = [[UIImageView alloc] init];
                viewController.explanatoryText = [[UITextView alloc] init];
            [viewController.explanatoryText setFont:[UIFont fontWithName:@"Helvetica Neue" size:17.0]];

                viewController.indexNumber = index;
                return viewController;
                }
            break;

        default:
            break;
    }
}

---------- CODE：ViewController与TextView ----------

-(void)viewWillAppear:(BOOL)animated {
    [_explanatoryText setFont:[UIFont fontWithName:@"Helvetica Neue" size:17.0]];

    [self.view addSubview:_explanatoryText];
    switch (_indexNumber) {

        case 0: {
            [_explanatoryText setText:@"...text that resizes ...."];

            break;
        }
            case 5:
            [_explanatoryText setText:@" ... text that resizes..."];

            break;
        default:
            break;
    }
}

-(void)viewDidAppear:(BOOL)animated {
    NSLog(@"viewDidAppear");
    [_explanatoryText setFont:[UIFont fontWithName:@"Helvetica Neue" size:17.0]];

}

-(void)viewDidDisappear:(BOOL)animated {
    [_explanatoryText setFont:[UIFont fontWithName:@"Helvetica Neue" size:17.0]];

}

-(void)viewWillDisappear:(BOOL)animated {
    [_explanatoryText setFont:[UIFont fontWithName:@"Helvetica Neue" size:17.0]];

}

案例1-4使用不同的ChildViewController（TutorialImageViewController），麻烦的textview是explainText。

我还尝试使用ChildViewController的生命周期方法来强制文本保持相同的大小。

希望这有助于澄清事情

PageController中的TextView任意改变字体大小

0 个答案: