添加UIViewController作为UIScrollView的子视图

Question

我正在构建一个应用程序，其中包含一些滚动内容。总之，这是我的配置：

1）class_1：与内（类似于照相机行东西元素集合中的视图）通过使用收集视图中列出

2）class_2：模态的视图称为由class_1在哪里显示每个单元素（从class_1）。同一类中，我也实现了所有元素的水平滚动

3）class_3：与ImageView的一个简单的视图控制器内将包含我会在class_2

显示元件中运行我的应用程序看起来像class_3不作为class_2的子视图添加，并且我尝试加载的所有单数内容都不可见。

下面是我class_2代码

接口：

#import <UIKit/UIKit.h> 
#import "class_3.h" 

@interface class_2 : UIViewController 

@property (strong, nonatomic) IBOutlet UIPageControl *pageControl; 
@property (strong, nonatomic) IBOutlet UIScrollView *scrollView; 
@property (weak, nonatomic) NSArray *imageList; 

@end 

实现：

@interface class_2() { 
    NSMutableArray *_viewControllers; 
} 

    - (void)loadScrollViewWithImage:(NSUInteger)indexImage; 

@end 

@implementation class_2 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    // _imageList is passed from class_1 when I call class_2. Contains an array of images 
    self.pageControl.numberOfPages = [_imageList count]; 
    self.pageControl.currentPage = 0; 

    // I store inside an array N objects as the number f images I have to show. At the beginning the array has only null objects, then it will contains the views based on the images I have scrolled. 
    //I am storying my images inside a view because maybe I will show more controls and not just the image. It will be much easier manage them. 
    _viewControllers = [[NSMutableArray alloc] init]; 
    for (NSUInteger i = 0; i < [_imageList count]; i++) { 
     [_viewControllers addObject:[NSNull null]]; 
    } 

    // I set some properties of my scrollview defined as outlet 
    self.scrollView.frame = CGRectMake(0, 0, 320, 345); 
    self.scrollView.contentSize = CGSizeMake(CGRectGetWidth(self.scrollView.frame) * [_imageList count], CGRectGetHeight(self.scrollView.frame)); 
    self.scrollView.pagingEnabled = YES; 
    // this is set to NO, I switched to YES just now for debug (at least I can see how big the area is since there are no images visible) 
    self.scrollView.showsHorizontalScrollIndicator = YES; 
    self.scrollView.showsVerticalScrollIndicator = NO; 
    self.scrollView.scrollsToTop = NO; 
    self.scrollView.delegate = self; 

    // for testing now I always take the first and second elements of my array. I load both so when I move from the first image to the second is already there and there is no gap/flashing effect 
    [self loadScrollViewWithImage:0]; 
    [self loadScrollViewWithImage:1]; 
} 

#pragma mark - Private methods 

- (void)loadScrollViewWithImage:(NSUInteger)indexImage { 
    // I scrolled until the last image, from here I can only go back 
    if (indexImage >= [_imageList count]) 
     return; 

    // I replace the placeholder (null) object 
    class_3 *controller = [_viewControllers objectAtIndex:indexImage]; 
    if ((NSNull *)controller == [NSNull null]) { 
     controller = [[class_3 alloc] init]; 
     [_viewControllers replaceObjectAtIndex:indexImage withObject:controller]; 
    } 

    // I add the controller's view to the scroll view - in case this is the first time I'm scrolling this image 
    if (controller.view.superview == nil) { 
     // I set my controller frame as the scrollview works as container 
     CGRect frame = self.scrollView.frame; 
     frame.origin.x = CGRectGetWidth(frame) * indexImage; 
     frame.origin.y = 0; 
     controller.view.frame = frame; 

     // I finally add my viewcontroller as child of my superview and subview of the scrollview 
     [self addChildViewController:controller]; 
     [self.scrollView addSubview:controller.view]; 
     [controller didMoveToParentViewController:self]; 

     // I set an image corrisponding with the element selected from class_1 
     controller.imageView.image = [_imageList objectAtIndex:indexImage] 

     // I also tried with a fake image...just in case. No one of them is visible 
     //controller.imageView.image = [UIImage imageNamed:@"tempPhoto"]; 
    } 
} 

我class_3是它承载仅一个图像视图shoulb与selezted相应的图像来填充一个的ViewController之前。 页面控制器用于显示我滚动的位置（letf/right）以及有多少个元素。滚动通过滚动视图进行物理管理。 这里是我的class_3定义

接口：

#import <UIKit/UIKit.h> 
#import "class_3.h" 

@interface class_3 : UIViewController 

@property (strong, nonatomic) IBOutlet UIImageView *imageView; 

@end 

实现（没有让人印象深刻）

#import "class_3.h" 

@interface class_3() 

@end 

@implementation class_3 

- (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. 

    self.imageView.image = [UIImage imageNamed:@"tempPhoto"]; 
} 

@end 

我缺少什么？

TNX

Answer 1

你class_3应该是一个UIView，而不是UIViewController，子类。见here