使用的是XHScrollMenu和UIPageViewController來構建5個頁面:
ViewController1, ViewController2, ViewController3, ViewController4, ViewController5。
XHScrollMenu和UIPageViewController左右滑動均可以控制頁面的切換。
一般情況下是正確的。
但如果點擊了menu，切換ViewController1，然后再點擊menu直接切換至ViewController5。
從ViewController5向右滑動往回切換的時候發現始終會直接切換至ViewController1，而不是ViewController4。
我用一個int變量來標識當前的頁面，以此作為跳轉的依據，但不起作用，原因是UIPageViewController調用Delegate的時候自動使用了ViewController1。
這可能是UIPageViewController的Bug，或者是一種緩存機制。
它的特點如下:
1.
self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
2.使用menu來控制切換的代碼如下
- (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) { //前翻或者后翻的條件判斷
__block XXViewController *blocksafeSelf = self;
[self.pageViewController setViewControllers:[NSArray arrayWithObject:[self viewControllerAtIndex:selectIndex]] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:^(BOOL finished) { //這里的YES是提供一個動畫效果
if (finished) {
dispatch_async(dispatch_get_main_queue(), ^{
[blocksafeSelf.pageViewController setViewControllers:[NSArray arrayWithObject:[blocksafeSelf viewControllerAtIndex:selectIndex]] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:NULL]; //這是實際起到跳轉作用的代碼，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];
});
}
}];
}
}