最近我编写了一个关于UIPageViewController的小教程:http://www.appcoda.com/uipageviewcontroller-tutorial-intro/
在完成这个教程后,我想知道是否可以将页面指示器的位置更改到屏幕顶部。
有人知道怎么做吗?
编辑
感谢你们迄今为止的帮助。我按照这篇文章进行了操作:How to put the UIPageControl element on top of the sliding pages within a UIPageViewController?
现在我已经将页面控制放在了顶部,但是一些奇怪的事情发生了: 如果你从第一页滑动到第二页,指示器会显示用户在第三页。 我加入了一个NSLog来显示当前索引,当向下滑动到下一页时,它从0变为1,然后变为2。
有人知道原因吗?
当前代码:
@property (weak, nonatomic) IBOutlet UIPageControl *pageControl;
@end
@implementation APPViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.pageController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
self.pageController.dataSource = self;
[[self.pageController view] setFrame:[[self view] bounds]];
APPChildViewController *initialViewController = [self viewControllerAtIndex:0];
NSArray *viewControllers = [NSArray arrayWithObject:initialViewController];
[self.pageController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
[self addChildViewController:self.pageController];
[[self view] addSubview:[self.pageController view]];
[self.pageController didMoveToParentViewController:self];
UIPageControl *pageControl = [UIPageControl appearance];
pageControl.pageIndicatorTintColor = [UIColor lightGrayColor];
pageControl.currentPageIndicatorTintColor = [UIColor orangeColor];
[self.view bringSubviewToFront:self.pageControl];
//Or whatever number of viewcontrollers you have
[self.pageControl setNumberOfPages:5];
}
- (APPChildViewController *)viewControllerAtIndex:(NSUInteger)index {
APPChildViewController *childViewController = [[APPChildViewController alloc] initWithNibName:@"APPChildViewController" bundle:nil];
childViewController.index = index;
return childViewController;
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
NSUInteger index = [(APPChildViewController *)viewController index];
if (index == 0) {
return nil;
}
// Decrease the index by 1 to return
index--;
[self.pageControl setCurrentPage:index];
return [self viewControllerAtIndex:index];
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
NSUInteger index = [(APPChildViewController *)viewController index];
index++;
[self.pageControl setCurrentPage:index];
if (index == 5) {
return nil;
}
return [self viewControllerAtIndex:index];
}
AppChildViewController:
@property (assign, nonatomic) NSInteger index;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
switch(self.index)
{
case zero: {
self.imageView.image = [UIImage imageNamed:@"page1.png"];
NSLog(@"%d",self.index);
break;
}
case one: {
self.imageView.image = [UIImage imageNamed:@"page2.png"];
NSLog(@"%d",self.index);
break;
}
case two: {
self.imageView.image = [UIImage imageNamed:@"page3.png"];
NSLog(@"%d",self.index);
break;
}
case three: {
self.imageView.image = [UIImage imageNamed:@"page4.png"];
NSLog(@"%d",self.index);
break;
}
default: {
self.imageView.image = [UIImage imageNamed:@"page5.png"];
NSLog(@"%d",self.index);
break;
}
}
}
index++
),那么它将变成2。 - Francis Yeap