Quicklook/QLPreviewController,iOS 8的一些问题,但一切都适用于iOS 7.1

Question

我正在使用QuickLook查看PDF文件.

它在iOS 7.1中正常工作,但iOS 8 GM会出现一些问题.

图片比文字好,我想告诉你问题:

iOS 7.1 Xcode 6(工作正常)

使用QuickLook进行转换(没有失败)

页面滚动,navigationBar隐藏得很好

-------------------------------------------------- ------------------------

而现在,iOS 8 GM与Xcode 6

使用QuickLook进行过渡...

页面滚动,navigationBar不隐藏,页面指示器隐藏在NavigationBar后面

与iPhone模拟器,iPad模拟器,iPhone设备和iPad设备相同的问题.

你可以在这里看到我的源代码:

- (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)previewController
{
    NSInteger numToPreview = 0;
    if (currentSection == CVSectionConvocations)
        numToPreview = self.convocation.convocations.count;
    else if (currentSection == CVSectionAttachments)
        numToPreview = self.convocation.attachements.count;
    return numToPreview;
}

- (id)previewController:(QLPreviewController *)previewController previewItemAtIndex:(NSInteger)idx
{
    PDF *pdf;
    if (currentSection == CVSectionConvocations)
        pdf = self.convocation.convocations[idx];
    else if (currentSection == CVSectionAttachments)
        pdf = self.convocation.attachements[idx];
    return [pdf path];
}



- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    // determine section
    currentSection = (indexPath.section == 0 ? CVSectionConvocations : CVSectionAttachments);

    PDF *pdf;
    if (currentSection == CVSectionConvocations)
        pdf = self.convocation.convocations[indexPath.row];
    else if (currentSection == CVSectionAttachments)
        pdf = self.convocation.attachements[indexPath.row];

    if ([pdf isStored]) {
        QLPreviewController *previewController = [[QLPreviewController alloc] init];
        previewController.dataSource = self;
        previewController.delegate = self;

        previewController.currentPreviewItemIndex = indexPath.row;
        [[self navigationController] pushViewController:previewController animated:YES];
    } else {
        [self displayMessage:@"Document not found" title:@"Oups !"];
    }
}

谢谢你的帮助 ;)

Answer 1

我最近已经能够修复背景问题错误（动画仍然不稳定）。

为了解决“黑色背景”问题，我在推送时设置了导航控制器视图的自定义背景颜色。当返回到我的视图控制器时，我确保将原始背景颜色恢复为零。

- (void)viewWillApear:(BOOL)animated {
   [super viewWillApear:animated];
   self.navigationController.view.backgroundColor = nil;

   // Optional - In order to ease the animation bug
   self.view.alpha = 1.0;
}


- (void)viewWillDissapear:(BOOL)animated {
   [super viewWillDissapear:animated];
   self.navigationController.view.backgroundColor = [UIColor whiteColor];

   // Optional - In order to ease the animation bug
   [UIView animateWithDuration:0.35 animations:^{
      self.view.alpha = 0.0;
   }];
}

此代码应该转到您要从中推送 QLPreviewController 的视图控制器。

这个解决方案绝对是最好的解决方案，但希望它能有所帮助！