如何在UIPageViewController中为所有webViews文本字体启用缩放

Question

我只在纵向模式下创建一个基于页面视图控制器的应用程序，在UIWebView中加载多个html页面。web视图内部具有放大和缩小功能。当我点击缩放按钮时，只有当前页面被缩放。我希望所有的网页视图文本字体都是相同的。我正在尝试，但没有得到正确的输出。

这是我的代码。。。。

   - (void)viewDidLoad
   {
      [super viewDidLoad];
     zoomButtonPressed = NO;
     buttonPressed = NO;
     //Instantiate the model array
     self.htmlArray = [[NSMutableArray alloc] init];
     NSString *path;
     NSBundle *bundle = [NSBundle mainBundle];
       for (int index = 1; index <= 94 ; index++)
        {
          path = [bundle pathForResource:[NSString stringWithFormat:@"p_%d",index]  
          ofType:@"html"];
         [self.htmlArray addObject:path];
        }  
       //Step 1
       //Instantiate the UIPageViewController.
       self.pageViewController = [[UIPageViewController alloc] 
       initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
       navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal 
       options:nil];
       //Step 2:
       //Assign the delegate and datasource as self.
       self.pageViewController.delegate = self;
       self.pageViewController.dataSource = self;
       //Step 3:
       //Set the initial view controllers.
       ContentViewController *contentViewController = [[ContentViewController alloc] 
       initWithNibName:@"ContentViewController_iPad" bundle:nil];
       contentViewController.strURL = [self.htmlArray objectAtIndex:0];
       NSArray *viewControllers = [NSArray arrayWithObject:contentViewController];
       [self.pageViewController setViewControllers:viewControllers
       direction:UIPageViewControllerNavigationDirectionForward animated:NO
       completion:nil];
       //Step 4:
       //Add the pageViewController as the childViewController
       [self addChildViewController:self.pageViewController];
       //Add the view of the pageViewController to the current view
       [self.view addSubview:self.pageViewController.view];
       [self.pageViewController didMoveToParentViewController:self];
       //Step 5:
       // set the pageViewController's frame as an inset rect.
       CGRect pageViewRect;
       pageViewRect = CGRectMake(5, 201, 745, 834);
       pageViewRect = CGRectInset(pageViewRect, 12.0, 73.0);
       self.pageViewController.view.frame = pageViewRect;
      //Step 6:
      self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;
     }

     #pragma mark - UIPageViewControllerDataSource Methods
     - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController
     viewControllerBeforeViewController:(UIViewController *)viewController
     {
       NSUInteger currentIndex = [self.htmlArray indexOfObject:[(ContentViewController  
       *)viewController strURL]];
          if(currentIndex == 0)
          {
             return nil;
          }
     ContentViewController *contentViewController = [[ContentViewController alloc] 
     init];
     contentViewController.strURL = [self.htmlArray objectAtIndex:currentIndex - 1];
     buttonPressed = NO;
     if (currentIndex % 2 == 0) {
        content=contentViewController;
     }
     else {
        content1=contentViewController;
     }
     if (zoomButtonPressed)
     {
        [self setTextZooming];
     }
    return contentViewController;  
   }
    - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController
    viewControllerAfterViewController:(UIViewController *)viewController
   {
      NSUInteger currentIndex = [self.htmlArray indexOfObject:[(ContentViewController 
      *)viewController strURL]];
      if(currentIndex == self.htmlArray.count-1)
      {
        return nil;
      } 
      ContentViewController *contentViewController = [[ContentViewController alloc] 
      init];
      contentViewController.strURL = [self.htmlArray objectAtIndex:currentIndex + 1];
      buttonPressed = NO;
      if (currentIndex % 2 == 0) {
         content=contentViewController;
      }
      else {
         content1=contentViewController;
      }
      if (zoomButtonPressed)
      {
         [self setTextZooming];
      }
    return contentViewController;
   }
   #pragma mark - UIPageViewControllerDelegate Methods
   - (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController 
   *)pageViewController
               spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation
   {
    if(UIInterfaceOrientationIsPortrait(orientation))
     {
    //Set the array with only 1 view controller
    UIViewController *currentViewController = [self.pageViewController.viewControllers 
    objectAtIndex:0];
    NSArray *viewControllers = [NSArray arrayWithObject:currentViewController];
    [self.pageViewController setViewControllers:viewControllers 
    direction:UIPageViewControllerNavigationDirectionForward animated:YES 
    completion:NULL];
    //Important- Set the doubleSided property to NO.
    self.pageViewController.doubleSided = NO;
    //Return the spine location
    return UIPageViewControllerSpineLocationMin;
  }
  else
   {
     NSArray *viewControllers = nil;
     ContentViewController *currentViewController =  
     [self.pageViewController.viewControllers objectAtIndex:0];
    NSUInteger currentIndex = [self.htmlArray indexOfObject:[(ContentViewController 
    *)currentViewController strURL]];
       if(currentIndex == 0 || currentIndex %2 == 0)
         {
        UIViewController *nextViewController = [self 
        pageViewController:self.pageViewController 
        viewControllerAfterViewController:currentViewController];
        viewControllers = [NSArray arrayWithObjects:currentViewController, 
        nextViewController, nil];
         }
       else
         {
            UIViewController *previousViewController = [self 
            pageViewController:self.pageViewController        
            viewControllerBeforeViewController:currentViewController];
            viewControllers = [NSArray arrayWithObjects:previousViewController,  
            currentViewController, nil];
         }
       //Now, set the viewControllers property of UIPageViewController
        [self.pageViewController setViewControllers:viewControllers 
        direction:UIPageViewControllerNavigationDirectionForward animated:YES 
        completion:NULL];
     return UIPageViewControllerSpineLocationMid;
     }
   }
   -(void) setTextZooming
   {
     if (!buttonPressed){
     content.webView.scrollView.scrollEnabled = YES;
     content1.webView.scrollView.scrollEnabled = YES;
     int fontSize = 120;
     NSString *string = [[NSString alloc] 
     initWithFormat:@"document.getElementsByTagName('body')
     [0].style.webkitTextSizeAdjust= '%d%%'", fontSize];
     [content.webView stringByEvaluatingJavaScriptFromString:string];
     [content1.webView stringByEvaluatingJavaScriptFromString:string];
     buttonPressed=YES;
     zoomButtonPressed = YES;
    }
    else{
     content.webView.scrollView.scrollEnabled = NO;
     content1.webView.scrollView.scrollEnabled = NO;
     int fontSize = 97;
     NSString *string = [[NSString alloc] 
     initWithFormat:@"document.getElementsByTagName('body') 
     [0].style.webkitTextSizeAdjust= '%d%%'", fontSize];
     [content.webView stringByEvaluatingJavaScriptFromString:string];
     [content1.webView stringByEvaluatingJavaScriptFromString:string];
     buttonPressed=NO;
     zoomButtonPressed = NO;
    }
   }
  // When user clicks on zoom button.
  -(IBAction)zoomBtnPressed:(id)sender
  {
     [self setTextZooming];
  }

Answer 1

我发现了问题：

在UIPageViewController中委托方法

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

问题是在返回我的视图控制器之前，我正在直接设置字体增加方法。方法"setTextZooming"正在调用，但它永远不会工作，因为事务（动画）正在进行中。因此设置动画：否或使用此。。

     if (zoomButtonPressed)
     {
         [self performSelector:@selector(setTextZooming) withObject:nil afterDelay:0.4];
     }

这对我有用…