Question

我将使用UIPageViewController创建一个教程页面。

但崩溃发生了。我找不到崩溃发生的那一点。

我正在尝试直接使用UIPageViwController，而不是在UIViewController中使用。

dataSource有效。但是当试图调用 [self setViewControllers：@ [pageZero]方向：UIPageViewControllerNavigationDirectionForward animated：YES completion：nil]; ，发生如下错误。

UserGuidePageViewController链接到右舷的UIPagveViewController框架。

以下是标题

#import <UIKit/UIKit.h>

@interface UserGuidePageViewController : UIPageViewController <UIPageViewControllerDataSource> {

}


@end

以下是代码

#import "UserGuidePageViewController.h"
#import "UserGuideViewController.h"


@interface UserGuidePageViewController () {

}

@property (nonatomic, retain) NSArray *array;

@end

@implementation UserGuidePageViewController


- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];

    if (self) {
        self.dataSource = self;
    }

    return self;
}

- (UserGuideViewController *)userGuideViewForPageIndex:(NSUInteger)pageIndex
{
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    UserGuideViewController *targetViewController = [storyboard instantiateViewControllerWithIdentifier:@"UserGuideViewController"];

    return targetViewController;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    UserGuideViewController *pageZero = [self userGuideViewForPageIndex:0];

    [self setViewControllers:@[pageZero] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
    --> Crash happened here!!!
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Page View Controller Data Source

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
    NSUInteger index = [(UserGuideViewController *)viewController pageIndex];

    return [self userGuideViewForPageIndex:(index - 1)];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
    NSUInteger index = [(UserGuideViewController *)viewController pageIndex];

    return [self userGuideViewForPageIndex:(index + 1)];
}

- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController
{
    // The number of items reflected in the page indicator.
    return 1;
}

- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController
{
    // The selected item reflected in the page indicator.
    return 0;
}

错误如下。

*** Assertion failure in -[_UIQueuingScrollView setView:direction:animated:completion:], /SourceCache/UIKit/UIKit-2903.23/_UIQueuingScrollView.m:671
2013-12-18 15:23:35.779 Natural Calendar[4497:60b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: view'
*** First throw call stack:
(0x30ef6f4b 0x3b6d36af 0x30ef6e25 0x3189efe3 0x33ba3321 0x33b382eb 0x33b38407 0xf4715 0x3366e37b 0x3366e139 0xf0c45 0x1062d9 0x1106c3 0x3369e713 0x3369e6b3 0x3369e691 0x3368a11f 0x3369e107 0x3369ddd9 0x33698e65 0x3366e79d 0x3366cfa3 0x30ec2183 0x30ec1653 0x30ebfe47 0x30e2ac27 0x30e2aa0b 0x35b0b283 0x336ce049 0xecd09 0x3bbdbab7)
libc++abi.dylib: terminating with uncaught exception of type NSException

实际上，我改成了Xcode模板样式。

但是也发生了这个错误。

- (void)viewDidLoad
{
    [super viewDidLoad];

    _pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
    [_pageViewController setDataSource:self];

    UserGuideViewController *pageZero = [self userGuideViewForPageIndex:0];

    [_pageViewController setViewControllers:@[pageZero] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];

    [self addChildViewController:_pageViewController];
    [self.view addSubview:[_pageViewController view]];

    CGRect pageViewRect = self.view.bounds;
    //pageViewRect = CGRectInset(pageViewRect, 40.0, 40.0);
    _pageViewController.view.frame = pageViewRect;

    [_pageViewController didMoveToParentViewController:self];
}

我不知道有什么问题。选择 UIPageViewControllerTransitionStyleScroll 时，发生错误。选择 UIPageViewControllerTransitionStylePageCurl 时，不会发生错误。

Answer 1

@interface UserGuidePageViewController : UIPageViewController <UIPageViewControllerDataSource> {

用

改变这一行

@interface UserGuidePageViewController : UIViewController <UIPageViewControllerDataSource> {

意味着您可以将UIViewcontroller用于此

请参阅this链接以供参考。

和另一个使用故事板的link。

Answer 2

我在页面loadView() { }处声明了ContentViewController。但是，loadView()仍然为空而未调用[super loadView];。因此，视图将保持nil。

现在，在删除方法loadView()后，它似乎正常工作。

使用Storyboard崩溃的UIPageviewController

2 个答案: