如何检测pageViewController中的最后一页已被调用,如果我想在最后一页添加手势识别器并转发到我的应用程序主页,有没有办法做到这一点?
这是我的基本pageViewController片段,
在我的UIPageViewController viewDidLoad中
- (void)viewDidLoad
{
[super viewDidLoad];
// Create the data model
_pageImages = @[@"intro_1@2x.png", @"intro_2@2x.png", @"intro_3@2x.png", @"intro_4@2x.png"];
// Create page view controller
self.pageViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"RKYGuide"];
self.pageViewController.dataSource = self;
RKYGuideContentViewController *startingViewController = [self viewControllerAtIndex:0];
NSArray *viewControllers = @[startingViewController];
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
[self addChildViewController:_pageViewController];
[self.view addSubview:_pageViewController.view];
[self.pageViewController didMoveToParentViewController:self];
}
另外,实现了两个页面视图控制器数据源方法
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
NSUInteger index = ((RKYGuideContentViewController*) viewController).pageIndex;
if ((index == 0) || (index == NSNotFound)) {
return nil;
}
index--;
return [self viewControllerAtIndex:index];
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
NSUInteger index = ((RKYGuideContentViewController*) viewController).pageIndex;
if (index == NSNotFound) {
return nil;
}
index++;
if (index == [self.pageImages count]) {
// adding gesture
pageViewController.view.userInteractionEnabled = YES;
pageViewController.view.contentMode = UIViewContentModeScaleAspectFit;
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc]
initWithTarget:self
action:@selector(startAction)];
[singleTap setNumberOfTapsRequired:1];
pageViewController.view.userInteractionEnabled = YES;
[pageViewController.view addGestureRecognizer:singleTap];
return nil;
}
NSLog(@"index: %u", index);
return [self viewControllerAtIndex:index];
}
它工作正常,但我不知道在到达最后一页时在哪里添加手势识别器,并导致我的主页.
编辑:我在viewControllerAfterViewController中添加了手势识别器,但它不起作用,没有响应.
最佳答案 修改你的方法请尝试: –
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
NSUInteger index = ((RKYGuideContentViewController*) viewController).pageIndex;
if (index == NSNotFound) {
return;
}
index++;
if (index == [self.pageImages count]) {
// adding gesture
pageViewController.view.userInteractionEnabled = YES;
pageViewController.view.contentMode = UIViewContentModeScaleAspectFit;
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc]
initWithTarget:self
action:@selector(startAction)];
[singleTap setNumberOfTapsRequired:1];
[self.view addGestureRecognizer:singleTap];
}
return [self viewControllerAtIndex:index];
}