UIPageviewController使用Storyboard崩溃

Question

我将使用UIPageViewController制作一个教程页面。

但是崩溃发生了。 我找不到发生崩溃的点。

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

dataSource有效。 但是，当尝试调用[self setViewControllers：@ [pageZero]方向：UIPageViewControllerNavigationDirectionForward动画：是完成：无]时； ，发生如下错误。

UserGuidePageViewController链接到右舷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，我变成了Xcode模板样式。

但是也会发生此错误。

- (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];
}

我不知道怎么了 选择UIPageViewControllerTransitionStyleScroll时 ，发生错误。 选择UIPageViewControllerTransitionStylePageCurl时 ，不会发生此错误。

Answer 1

@interface UserGuidePageViewController : UIPageViewController <UIPageViewControllerDataSource> {

更改此行

@interface UserGuidePageViewController : UIViewController <UIPageViewControllerDataSource> {

意味着您可以为此使用UIViewcontroller

请参阅此链接以供参考。

这是用于情节提要的另一个链接 。

Answer 2

我发现在ContentViewController页面上声明了loadView() { } 。 但是loadView()保持为空而不调用[super loadView]; 。 结果，该视图将保持为nil 。

现在，在删除方法loadView()之后，它似乎可以工作。