不带故事板的iOS 3D Touch Peek/Pop

我正试图让peek/pop在一个非故事板Objective-C项目中工作，我一直使用白色背景，而不是模糊背景。我已经在模拟器和iPhone上试过了

- (UIViewController *)previewingContext:(id<UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location{
if ([self.presentedViewController isKindOfClass:[LoadTreatmentDetailViewController class]]) {
    return nil;
}

NSIndexPath *indexPath = [self.loadTreatmentsTableView indexPathForRowAtPoint:location];

if(indexPath){
    AllTreatmentsTableViewCell *tableCell = [self.loadTreatmentsTableView cellForRowAtIndexPath:indexPath];

    if(tableCell.treatment){
        LoadTreatmentDetailViewController *previewController = [[LoadTreatmentDetailViewController alloc] initWithTreatment:tableCell.treatment withContext:self.context];
        if(previewController){
            previewController.preferredContentSize = CGSizeMake(0.0, 0.0);
            previewingContext.sourceRect = tableCell.frame;

            return previewController;
        }
    }
}
return nil;
}

- (void)previewingContext:(id<UIViewControllerPreviewing>)previewingContext commitViewController:(UIViewController *)viewControllerToCommit{
[self presentViewController:viewControllerToCommit animated:YES completion:nil];
}

- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection {
[super traitCollectionDidChange:previousTraitCollection];
if([self isForceTouchAvailable]){
    if(!self.previewingContext){
        self.previewingContext = [self registerForPreviewingWithDelegate:self sourceView:self.view];
    }
}else{
    if(self.previewingContext){
        [self unregisterForPreviewingWithContext:self.previewingContext];
        self.previewingContext = nil;
    }
}
}

- (BOOL)isForceTouchAvailable {
BOOL isForceTouchAvailable = NO;
if([self.traitCollection respondsToSelector:@selector(forceTouchCapability)]){
    isForceTouchAvailable = self.traitCollection.forceTouchCapability == UIForceTouchCapabilityAvailable;
}
return isForceTouchAvailable;
}

-（UIViewController*）previewingContext:（id）previewingContext viewControllerForLocation:（CGPoint）位置{
如果（[self.presentedViewController是类：[LoadTreatmentDetailViewController类]]）{
返回零；
}
NSIndexPath*indexPath=[self.loadTreatmentsTableView indexPathForRowAtPoint:location]；
if（indexath）{
AllTreatmentsTableViewCell*tableCell=[self.loadTreatmentsTableView cellForRowAtIndexPath:indexPath]；
if（表细胞治疗）{
LoadTreatmentDetailViewController*previewController=[[LoadTreatmentDetailViewController alloc]initWithTreatment:tableCell.treatment withContext:self.context]；
if（预览控制器）{
previewController.preferredContentSize=CGSizeMake（0.0,0.0）；
previewingContext.sourceRect=tableCell.frame；
返回预览控制器；
}
}
}
返回零；
}
-（void）previewingContext:（id）previewingContext commitViewController:（UIViewController*）viewControllerToCommit{
[self-presentViewController:viewControllerToCommit动画：是完成：无]；
}
-（void）traitCollectionDidChange:（UITraitCollection*）以前的TraitCollection{
[super traitCollectionDidChange:previousTraitCollection]；
如果（[自身可用]）{
如果（！self.previewingContext）{
self.previewingContext=[self-registerForPreviewingWithDelegate:self-sourceView:self.view]；
}
}否则{
if（self.previewingContext）{
[self unregisterForPreviewingWithContext:self.previewingContext]；
self.previewingContext=nil；
}
}
}
-（BOOL）是否可用{
BOOL isForceTouchAvailable=否；
if（[self.traitCollection respondsToSelector:@selector（forceTouchCapability）]）{
isForceTouchAvailable=self.traitCollection.forceTouchCapability==UIForceTouchCapabilityAvailable；
}
返回是可用的；
}

可能吗

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谢谢你的帮助

这是我用于Scrollview的UIAppearance

我想部分问题是我在应用程序中的一些UIAppearance代码有些模糊，但仍然有白色背景，而且我第一次按下tableviewcell时没有看到它。