我正在构建一个内部滚动的应用程序。简而言之，这是我的配置：
1）class_1：使用集合视图列出的内部包含一组元素（类似于相机行）的视图
2) class_2：由 class_1 调用的模态视图，其中显示了选择的每个奇异元素（来自 class_1）。在同一个类中，我还实现了所有元素的水平滚动
3）class_3：一个简单的viewcontroller，里面有一个imageview，里面将包含我将在class_2中展示的元素
运行我的应用程序看起来 class_3 没有添加为 class_2 的子视图，并且我尝试加载的所有单一内容都不可见。
下面是我的 class_2 代码
界面：
#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
执行：
@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"];
}
}
我的 class_3 是一个视图控制器，它只承载一个图像视图，应该填充之前选择的相应图像。pagecontroller 用于显示我滚动的位置（letf/right）以及有多少元素。滚动是通过滚动视图进行物理管理的。这是我的 class_3 定义
界面：
#import <UIKit/UIKit.h>
#import "class_3.h"
@interface class_3 : UIViewController
@property (strong, nonatomic) IBOutlet UIImageView *imageView;
@end
实施（没有什么真正令人印象深刻的）
#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
我错过了什么？
肿瘤坏死因子