Question

我是iPad开发的新手。我知道如何使用页面视图控制器的图像。我的问题是我有三个图表，我在三个视图控制器中完成..如何在一个页面视图控制器中组合所有视图控制器。我现在保留了三个视图控制器。

我已经尝试了很多教程，但没有人解释我如何使用三个视图控制器我现在这样做了，但这是错误的

-(IBAction)handleSwipeLeft:(UISwipeGestureRecognizer*)sender {

    LastLearningSessionViewController *last=[[LastLearningSessionViewController alloc]init];
    [self presentViewController:last animated:YES completion:nil];
}

Answer 1

从我所看到的情况来看，你可能已经做到了这一点。

首先，您需要为UIPageViewController创建一个控制器，即数据源和委托。

请注意，所有代码都已直接写入答案，尚未经过测试。

MyUIPageViewController.h

@interface
MyUIPageViewController : UIViewController <UIPageViewControllerDataSource, UIPageViewControllerDelegate>
{
  NSNumber *currentIndex //Using NSNumber to handle 32bit/64bit easier.
}
@property (nonatomic, strong) UIPageViewController *pageViewController
@property (nonatomic, strong) NSArray *controllersArray //Used to help navigate between controllers
@end

MyUIPageViewController.m

#import MyUIPageViewController.h

@implementation MyUIPageViewController

- (instancetype)initWithNibName:(NSString *)nibName
                     bundle:(NSBundle *)nibBundle
{
  if(self = [super initWithNibName:nibName bundle:nibBundle])
  {
     //Create ChartViewController1 (UIViewController *ChartViewController1 = [[ChartViewController1Class alloc] init];)
     //Create ChartViewController2
     //Create ChartViewController3

     //Now we have created all 3 chartViewControllers, create our controllers Array with the controller objects.         

     self.controllersArray = [[NSArray alloc] initWithObjects:ChartViewController1, ChartViewController2, ChartViewController3];

     //Currently setting to 0. A proper way of handling with Multi-tasking is to store the index value from before, but not dealing with that right now.
     currentIndex = [NSNumber numberWithInt:0];

     //Create our PageViewController. Currently set to PageCurl and all pages will go from left to right.
     //These options can be changed, if so desired (Scroll Effect like iBooks Textbooks and a page change from bottom to top like a flip book.

     self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];

    //Set ourselves as the datasource and delegate to handle the pages etc.

    self.pageViewController.datasource = self;
    self.pageViewController.delegate = self;

    //We need to set the viewControllers for the PageViewController, because this is the initial load, we will not animate the change.

    [self.pageViewController setViewControllers:self.controllersArray direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:^ (BOOL finished) {
    //No animation is being done so no need to worry.
}];

     //Set our view to be the pagecontroller's view, so we can see it all.
     self.view = self.pageViewController.view;
  }

 return self;
}

//DataSource Methods:

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController
  viewControllerBeforeViewController:(UIViewController *)viewController
{
   //As this method looks for the previous view controller. If our current index is 0, there is no previous VC. But using the objectAtIndex method on the array would throw a outOfRange exception

   if([self.currentIndex intValue] <= 0)
   {
     return nil;
   }
   else
   {
     return [self.controllersArray objectAtIndex:([self.currentIndex intValue] - 1)];
   }
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController
   viewControllerAfterViewController:(UIViewController *)viewController
{
   //As this method looks for the next view controller. If our current index is the maximum value the array count and be (2), there isn't a new VC to push. But using the objectAtIndex method on the array would throw a outOfRange exception

   if([self.currentIndex intValue] >= self.controllersArray.count)
   {
     return nil;
   }
   else
   {
     return [self.controllersArray objectAtIndex:([self.currentIndex intValue] + 1)];
   }
}

//Delegate Methods

- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed
{
   if(transitionCompleted)
   {
     //We will update our currentIndex, only if the transition has happened.

     switch (previousViewControllers)
     {
       case 0:
       //Something went wrong :S
       break;
       case 1:
       //We are either in Vertical Orientation of the first viewController is only being shown.
       if([pageViewController.viewControllers contains:[self.controllersArray objectAtIndex:([currentIndex intValue]+ 1)]])
       {
         currentIndex = [NSNumber numberWithInt:([currentIndex intValue] + 1)];
       }
       else
       {
         if([currentIndex intValue] == 0)
         {
           //Saftey Net.
         }
         else
         {
         currentIndex = [NSNumber numberWithInt:([currentIndex intValue] - 1)];
         }
       }
       break;
       case 2:

       //We are in horizontal Orientation.

       //With 3 View Controllers the only ViewController that will be in both arrays is the ViewController at index 1. We just need to see if the pageViewControllers viewcontrollers array contains the ViewController at index 0 or index 1.
       if([pageViewController.viewControllers contains:[self.controllersArray objectAtIndex:([currentIndex intValue]+ 1)]])
       {
         currentIndex = [NSNumber numberWithInt:([currentIndex intValue] + 1)];
       }
       else
       {

         if([currentIndex intValue] == 0)
         {
           //Saftey Net.
         }
         else
         {
         currentIndex = [NSNumber numberWithInt:([currentIndex intValue] - 1)];
         }

       }

       break;
       default:
       //Should never reach here.
       break;
     }
   }
}
@end

查看参考文档也很方便：

Class Reference - Apple Docs

页面视图控制器有3个视图控制器页面

1 个答案: