UIPageViewController跳跃切换的问题
使用的是XHScrollMenu和UIPageViewController来构建5个页面:
ViewController1, ViewController2, ViewController3, ViewController4, ViewController5。
XHScrollMenu和UIPageViewController左右滑动均可以控制页面的切换。
一般情况下是正确的。
但如果点击了menu，切换ViewController1，然后再点击menu直接切换至ViewController5。
从ViewController5向右滑动往回切换的时候发现始终会直接切换至ViewController1，而不是ViewController4。
我用一个int变量来标识当前的页面，以此作为跳转的依据，但不起作用，原因是UIPageViewController调用Delegate的时候自动使用了ViewController1。
这可能是UIPageViewController的Bug，或者是一种缓存机制。
它的特点如下:
1.
self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
2.使用menu来控制切换的代码如下
- (void)scrollMenuDidSelected:(XHScrollMenu *)scrollMenu menuIndex:(NSUInteger)selectIndex {
[_pageViewController setViewControllers:[NSArray arrayWithObject:[self viewControllerAtIndex:selectIndex]] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL]
}
最后修改:
- (void)scrollMenuDidSelected:(XHScrollMenu *)scrollMenu menuIndex:(NSUInteger)selectIndex {
if (selectIndex > _pageIndex) { //前翻或者后翻的条件判断
__block XXViewController *blocksafeSelf = self;
[self.pageViewController setViewControllers:[NSArray arrayWithObject:[self viewControllerAtIndex:selectIndex]] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:^(BOOL finished) { //这里的YES是提供一个动画效果
if (finished) {
dispatch_async(dispatch_get_main_queue(), ^{
[blocksafeSelf.pageViewController setViewControllers:[NSArray arrayWithObject:[blocksafeSelf viewControllerAtIndex:selectIndex]] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:NULL]; //这是实际起到跳转作用的代码，animated:NO
});
}
}];
} else {
__block XXViewController *blocksafeSelf = self;
[self.pageViewController setViewControllers:[NSArray arrayWithObject:[self viewControllerAtIndex:selectIndex]] direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:^(BOOL finished){
if (finished) {
dispatch_async(dispatch_get_main_queue(), ^{
[blocksafeSelf.pageViewController setViewControllers:[NSArray arrayWithObject:[blocksafeSelf viewControllerAtIndex:selectIndex]] direction:UIPageViewControllerNavigationDirectionReverse animated:NO completion:NULL];
});
}
}];
}
}
