在我的自定义 UIPageViewController 类中:
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self) {
self.model = [[BSTCMWelcomingPageViewModel alloc] init];
self.dataSource = self.model;
self.delegate = self;
self.pageControl = [UIPageControl appearance];
self.pageControl.pageIndicatorTintColor = [UIColor lightGrayColor];
self.pageControl.currentPageIndicatorTintColor = [UIColor blackColor];
}
return self;
}
然后我在点击按钮时以编程方式设置当前 ViewController:
- (void)scrollToNext
{
UIViewController *current = self.viewControllers[0];
NSInteger currentIndex = [self.model indexForViewController:current];
UIViewController *nextController = [self.model viewControllerForIndex:++currentIndex];
if (nextController) {
NSArray *viewControllers = @[nextController];
// This changes the View Controller, but PageControl doesn't update
[self setViewControllers:viewControllers
direction:UIPageViewControllerNavigationDirectionForward
animated:YES
completion:nil];
//Nothing happens!
[self.pageControl setCurrentPage:currentIndex];
//Error: _installAppearanceSwizzlesForSetter: Not a setter!
[self.pageControl updateCurrentPageDisplay];
}
}
如果我不能用“属于”我的 UIPageViewController 的 UIPageControl 来做到这一点，我将尝试自己制作。但如果这是可能的，那就太好了!
最佳答案
要更新您的 UIPageControl 指示器，您需要实现 UIPageViewController 的一种数据源方法(UIPageViewControllerDataSource 方法):
-(NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController
此方法负责更新页面控件指示器(当您使用 UIPageViewController 时)。您只需要在此方法中返回当前页面值。当您在自定义 UIPageViewController 上使用/调用 setViewControllers 时，默认情况下会调用该方法。
所以您需要编写的代码块是:
- (void)scrollToNext
{
UIViewController *current = self.viewControllers[0];
NSInteger currentIndex = [self.model indexForViewController:current];
UIViewController *nextController = [self.model viewControllerForIndex:++currentIndex];
if (nextController) {
NSArray *viewControllers = @[nextController];
// This changes the View Controller and calls the presentationIndexForPageViewController datasource method
[self setViewControllers:viewControllers
direction:UIPageViewControllerNavigationDirectionForward
animated:YES
completion:nil];
}
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController
{
return currentIndex;
}
希望这能解决您的问题。 :)
关于ios - 以编程方式更改 UIPageViewController 的页面不会更新 UIPageControl，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22554877/