我拿了Photo Scroller来自苹果网站的示例,并尝试通过复制代码来实现我自己的专辑。现在,UIScrollView
不可见。我该如何让它出现?
我所做的唯一代码更改是创建 UIPageViewController
。就我而言,打开它的是 UIViewController
,而不是 AppDelegate
。
@implementation BasePhotoViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nil bundle:nibBundleOrNil];
if (self) {
// kick things off by making the first page
PhotoViewController *pageZero = [PhotoViewController photoViewControllerForPageIndex:0];
if (pageZero != nil)
{
// assign the first page to the pageViewController (our rootViewController)
//UIPageViewController *pageViewController = (UIPageViewController *) [[UIApplication sharedApplication] keyWindow].rootViewController;
UIPageViewController *pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:0 navigationOrientation:0 options:nil];
//UIPageViewController *pageViewController = (UIPageViewController *)self.parentViewController;
pageViewController.dataSource = self;
[pageViewController setViewControllers:@[pageZero]
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:NULL];
}
}
return self;
}
最佳答案
您没有将 pageViewController
的 View 添加为 BasePhotoViewController
View 的 subview 。您的 BasePhotoViewController
类应该如下所示。请注意viewDidLoad
中的代码。
BasePhotoViewController.h:
@interface BasePhotoViewController : UIViewController <UIPageViewControllerDataSource>
@property (nonatomic, strong) UIPageViewController * pageViewController;
@end
BasePhotoViewController.m:
#import "BasePhotoViewController.h"
#import "PhotoViewController.h"
@implementation BasePhotoViewController
@synthesize pageViewController;
- (id)initWithCoder:(NSCoder *)coder
{
self = [super initWithCoder:coder];
if (self) {
PhotoViewController *pageZero = [PhotoViewController photoViewControllerForPageIndex:0];
if (pageZero != nil)
{
self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:0
navigationOrientation:0
options:nil];
self.pageViewController.dataSource = self;
[self.pageViewController setViewControllers:@[pageZero]
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:NULL];
}
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self addChildViewController:self.pageViewController];
[self.view addSubview:self.pageViewController.view];
[self.pageViewController didMoveToParentViewController:self];
}
# pragma mark - UIPageViewControllerDataSource
- (UIViewController *)pageViewController:(UIPageViewController *)pvc viewControllerBeforeViewController:(PhotoViewController *)vc
{
NSUInteger index = vc.pageIndex;
return [PhotoViewController photoViewControllerForPageIndex:(index - 1)];
}
- (UIViewController *)pageViewController:(UIPageViewController *)pvc viewControllerAfterViewController:(PhotoViewController *)vc
{
NSUInteger index = vc.pageIndex;
return [PhotoViewController photoViewControllerForPageIndex:(index + 1)];
}
@end
注意:我已经在 initWithCoder:
中初始化了 UIPageViewController
,因为 Apple 的 Photo Scroller代码使用 Storyboard。我从 Storyboard中删除了 UIPageViewController
并在其位置创建了一个 BasePhotoViewController
。如果您没有从 Storyboard加载 BasePhotoViewController
,则应将 initWithCoder:
中的代码移动到适当的初始化程序。
编辑:请参阅此 sample project在 github 上。
关于ios - 如何使用 UIScrollView 实现 UIPageViewController?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17171777/