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Q:3D Touch Peek and Pop from UITableViewCell how to hand over data to other UIViewController?

Q:3D触摸PEEK和流行从UITableViewCell如何数据交给其他窗口?

my app stores different attributes in Core Data objects. They are all shown in a UITableView, if you click a cell, a DetailView is shown. the usual stuff like in the Master-Detail-XCode-Template.

Now I want to implement 3D Touch with peek and pop. Like in the Mail app, 3D touch a cell, get preview, press deeper, pop in the detail.

I got this working so far, but I can t figure out how to pass the corresponding data in

- (nullable UIViewController *)previewingContext:(id <UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location

and

- (void)previewingContext:(id <UIViewControllerPreviewing>)previewingContext commitViewController:(UIViewController *)viewControllerToCommit

to the other DetailViewController.

If you just click the cell (no 3D touch) I hand over the data in

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
    NSManagedObject *object = [[self fetchedResultsController] objectAtIndexPath:indexPath];
    [[segue destinationViewController] setDetailItem:object];

I am using a

id detailItem

in every ViewController and I set the corresponding object to it.

So I try to get something similar to work, so in my DetailViewController my "detailItem" needs the corresponding Core Data object from the selected (3D touched) cell.

Thanks for help !

我的应用程序在核心数据对象中存储不同的属性。他们都在一个表格所示,如果你点击一个细胞,一个DetailView显示。平常的东西像在主从Xcode模板。

现在我想实现3D触摸与PEEK和POP。像在邮件应用程序中,3D触摸一个单元格,得到预览,按下更深,弹出的细节。

到目前为止,我已经完成了这项工作,但我不知道如何传递相应的数据

- (nullable UIViewController *)previewingContext:(id <UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location

- (void)previewingContext:(id <UIViewControllerPreviewing>)previewingContext commitViewController:(UIViewController *)viewControllerToCommit

对其他detailviewcontroller。

If you just click the cell (no 3D touch) I h和 over the data in

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
    NSManagedObject *object = [[self fetchedResultsController] objectAtIndexPath:indexPath];
    [[segue destinationViewController] setDetailItem:object];

我用的是

id detailItem

in every ViewController 和 I set the corresponding object to it.

所以我尝试类似的工作,所以我detailviewcontroller我”detailitem”需要相应的核心数据对象的选择(3D感动)细胞。

谢谢帮助!

answer1: 回答1:

Get the destination View controller from the storyboard using its storyboard ID and pass the objects that you are doing in prepareForSegue method.

Below is the code that I use to pass the data. Its in Swift, it should be similar in objective C. Let me know if you want Objective C version.

func previewingContext(previewingContext: UIViewControllerPreviewing,viewControllerForLocation location: CGPoint) -> UIViewController? method:

    // Obtain the index path and the cell that was pressed.
    guard let indexPath = tableView.indexPathForRowAtPoint(location),
              cell = tableView.cellForRowAtIndexPath(indexPath) else { return nil }

    // Create a destination view controller and set its properties.
    guard let destinationViewController = storyboard?.instantiateViewControllerWithIdentifier("DestinationViewController") as? DestinationViewController else { return nil }
    let object = fetchedResultController.objectAtIndexPath(indexPath)
    destinationViewController.detailItem = object

    /*
        Set the height of the preview by setting the preferred content size of the destination view controller. Height: 0.0 to get default height
    */
    destinationViewController.preferredContentSize = CGSize(width: 0.0, height: 0.0)

    previewingContext.sourceRect = cell.frame

    return destinationViewController
}

Get the destination View controller from the storyboard using its storyboard ID 和 pass the objects that you are doing in prepareForSegue method.

下面是我用来传递数据的代码。它的迅速,它应该是类似的目标C.让我知道,如果你想要客观的C版本。

func previewingContext(previewingContext: UIViewControllerPreviewing,viewControllerForLocation location: CGPoint) -> UIViewController? method:

    // Obtain the index path 和 the cell that was pressed.
    guard let indexPath = tableView.indexPathForRowAtPoint(location),
              cell = tableView.cellForRowAtIndexPath(indexPath) else { return nil }

    // Create a destination view controller 和 set its properties.
    guard let destinationViewController = storyboard?.instantiateViewControllerWithIdentifier("DestinationViewController") as? DestinationViewController else { return nil }
    let object = fetchedResultController.objectAtIndexPath(indexPath)
    destinationViewController.detailItem = object

    /*
        Set the height of the preview by setting the preferred content size of the destination view controller. Height: 0.0 to get default height
    */
    destinationViewController.preferredContentSize = CGSize(width: 0.0, height: 0.0)

    previewingContext.sourceRect = cell.frame

    return destinationViewController
}
answer2: 回答2:

If you are using storyboard segues from the cell to the new view controller, the sender is the table view cell.

So you could implement prepareForSegue: as such:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([sender isKindOfClass:[UITableViewCell class]]) {

        UITableViewCell *cell = sender;
        NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];

        id viewController = segue.destinationViewController;

        // Get your data object
        // Pass it to the new view controller
    }
}

如果您使用的是故事就从细胞到新的视图控制器,发件人是表观细胞。

所以你可以实现prepareforsegue:如:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([sender isKindOfClass:[UITableViewCell class]]) {

        UITableViewCell *cell = sender;
        NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];

        id viewController = segue.destinationViewController;

        // Get your data object
        // Pass it to the new view controller
    }
}
answer3: 回答3:

Base on Dheeraj's reply, adjust some code to rectify the wrong touch location of tableview cell. Assume we need pass the value named type to destination controller.

- (nullable UIViewController *)previewingContext:(id <UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location{
// check if we're not already displaying a preview controller
if ([self.presentedViewController isKindOfClass:[DetailViewController class]]) {
    return nil;
}

CGPoint cellPostion = [self.tableview convertPoint:location fromView:self.view];
NSIndexPath *path = [self.tableview indexPathForRowAtPoint:cellPostion];

if (path) {
    UITableViewCell *cell = [self.tableview cellForRowAtIndexPath:path];
    type = [[self.data objectAtIndex:path.row] integerValue];
    // shallow press: return the preview controller here (peek)
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    DetailViewController *previewController = [storyboard instantiateViewControllerWithIdentifier:@"DetailViewController"];
    previewController.type = type;
    previewingContext.sourceRect = [self.view convertRect:cell.frame fromView:self.tableview];
    return previewController;
}
return nil;

}

在答复Dheeraj的基地,调整一些代码来纠正错误的触摸位置tableview细胞。假设我们需要将类型命名的值传递给目标控制器。

- (nullable UIViewController *)previewingContext:(id <UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location{
// check if we're not already displaying a preview controller
if ([self.presentedViewController isKindOfClass:[DetailViewController class]]) {
    return nil;
}

CGPoint cellPostion = [self.tableview convertPoint:location fromView:self.view];
NSIndexPath *path = [self.tableview indexPathForRowAtPoint:cellPostion];

if (path) {
    UITableViewCell *cell = [self.tableview cellForRowAtIndexPath:path];
    type = [[self.data objectAtIndex:path.row] integerValue];
    // shallow press: return the preview controller here (peek)
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    DetailViewController *previewController = [storyboard instantiateViewControllerWithIdentifier:@"DetailViewController"];
    previewController.type = type;
    previewingContext.sourceRect = [self.view convertRect:cell.frame fromView:self.tableview];
    return previewController;
}
return nil;

}

ios  objective-c  uitableview  3dtouch