ios - notes - uialertcontroller objective c

UIAlertController está bloqueado(iPad)

Question

Estoy usando Xcode 6 para desarrollar una aplicación iOS.

Cuando usé UIAlertController , puede funcionar bien en el simulador de iPhone 6, pero se bloquea en el simulador de iPad.

Mi problema al hacer clic en "compartir", entonces podría bloquearse. ¿Cómo podría resolverlo?

Aquí está mi código:

override func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [AnyObject] {

    var shareAction = UITableViewRowAction(style: UITableViewRowActionStyle.Default, title: "Share", handler: { (action:UITableViewRowAction!, indexPath:NSIndexPath!) -> Void in

        let shareMenu = UIAlertController(title: nil, message: "Share using", preferredStyle: .ActionSheet)
        let twitterAction = UIAlertAction(title: "Twitter", style: UIAlertActionStyle.Default, handler: nil)
        let facebookAction = UIAlertAction(title: "Facebook", style: UIAlertActionStyle.Default, handler: nil)
        let emailAction = UIAlertAction(title: "Email", style: UIAlertActionStyle.Default, handler: nil)
        let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil)

        shareMenu.addAction(twitterAction)
        shareMenu.addAction(facebookAction)
        shareMenu.addAction(emailAction)
        shareMenu.addAction(cancelAction)

        self.presentViewController(shareMenu, animated: true, completion: nil)
        }
    )

Xcode mostró este mensaje:

******Terminating app due to uncaught exception ''NSGenericException'', reason: ''Your application has presented a UIAlertController (<UIAlertController: 0xaf71c80>) of style UIAlertControllerStyleActionSheet. The modalPresentationStyle of a UIAlertController with this style is UIModalPresentationPopover. You must provide location information for this popover through the alert controller''s popoverPresentationController. You must provide either a sourceView and sourceRect or a barButtonItem.  If this information is not known when you[![enter image description here][1]][1] present the alert controller, you may provide it in the UIPopoverPresentationControllerDelegate method -prepareForPopoverPresentation.''
*** First throw call stack:
(
    0   CoreFoundation                      0x0023c746 __exceptionPreprocess + 182
    1   libobjc.A.dylib                     0x01c7aa97 objc_exception_throw + 44
    2   UIKit                               0x012c4062 -[UIPopoverPresentationController presentationTransitionWillBegin] + 3086
    3   UIKit                               0x00bda174 __71-[UIPresentationController _initViewHierarchyForPresentationSuperview:]_block_invoke + 1549
    4   UIKit                               0x00bd8247 __56-[UIPresentationController runTransitionForCurrentState]_block_invoke + 198
    5   UIKit                               0x00c0d31b __40+[UIViewController _scheduleTransition:]_block_invoke + 18
    6   UIKit                               0x00ac6862 ___afterCACommitHandler_block_invoke + 15
    7   UIKit                               0x00ac680d _applyBlockToCFArrayCopiedToStack + 415
    8   UIKit                               0x00ac6622 _afterCACommitHandler + 549
    9   CoreFoundation                      0x0015d86e __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30
    10  CoreFoundation                      0x0015d7b0 __CFRunLoopDoObservers + 400
    11  CoreFoundation                      0x001531ea __CFRunLoopRun + 1226
    12  CoreFoundation                      0x00152a5b CFRunLoopRunSpecific + 443
    13  CoreFoundation                      0x0015288b CFRunLoopRunInMode + 123
    14  GraphicsServices                    0x047b82c9 GSEventRunModal + 192
    15  GraphicsServices                    0x047b8106 GSEventRun + 104
    16  UIKit                               0x00a9c106 UIApplicationMain + 1526
    17  Mars I                              0x0001c724 main + 180
    18  libdyld.dylib                       0x02392ac9 start + 1
    19  ???                                 0x00000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException******

Answer 1

Para mantener su dispositivo independiente, utilícelo como se muestra en el fragmento de código a continuación. Este código devolverá cero para popoverPresentationController en un iPhone / dispositivo de tamaño compacto, por lo que puede usarlo de manera segura en proyectos universales.

if let popoverPresentationController = shareMenu.popoverPresentationController {
    popoverPresentationController.sourceView = self.view
    popoverPresentationController.sourceRect = sender.bounds
}
self.presentViewController(shareMenu, animated: true, completion: nil)

Answer 2

Swift 3

shareMenu.popoverPresentationController?.sourceView = self.view
shareMenu.popoverPresentationController?.sourceRect = 
    CGRect(x: view.bounds.size.width, 
           y: view.bounds.size.height-80, 
           width: 1.0, height: 1.0)

fuente rect es el punto desde el que desea mostrar la vista emergente.

Answer 3

Swift 4

popoverPresentationController.permittedArrowDirections = .init(rawValue: 0) popoverPresentationController.sourceView = self.view popoverPresentationController.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)

Answer 4

También me enfrento al mismo problema y finalmente tengo la solución. Aquí está mi solución para el objetivo c

extension UIAlertController {

    class func actionSheetWith(title: String?, message: String?, sourceView: UIView?, sourceFrame: CGRect?) -> UIAlertController {
        let actionController = UIAlertController(title: title, message: message, preferredStyle: .actionSheet)
        if actionController.responds(to: #selector(getter: popoverPresentationController)) {
            actionController.popoverPresentationController?.sourceView = sourceView ?? StoryboardHelper.tabBarControllerTopController()?.view
            actionController.popoverPresentationController?.sourceRect = sourceFrame ?? CGRect(x: 0, y: 0, width: 0, height: 0)
        }
        return actionController
    }

}

Answer 5

Uso esta extensión práctica para crear hojas de acción que nunca fallan

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Select you option:"
                                                                         message:nil
                                                                  preferredStyle:UIAlertControllerStyleActionSheet];

UIAlertAction *action = [UIAlertAction actionWithTitle:@“share”
                                                     style:UIAlertActionStyleDefault
                                                   handler:^(UIAlertAction *action) {
                                                       // do other things
                                                   }];
[alertController addAction:action];

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel"
                                                       style:UIAlertActionStyleCancel
                                                     handler:^(UIAlertAction *action) {
                                                     }];
[alertController addAction:cancelAction];

// Remove arrow from action sheet.
[alertController.popoverPresentationController setPermittedArrowDirections:0];

//For set action sheet to middle of view.
CGRect rect = self.view.frame;
rect.origin.x = self.view.frame.size.width / 20;
rect.origin.y = self.view.frame.size.height / 20;
alertController.popoverPresentationController.sourceView = self.view;
alertController.popoverPresentationController.sourceRect = rect;

[self presentViewController:alertController animated:YES completion:nil];

Answer 6

Uso este código, muy fácil y comprensible, tal vez pueda ayudar para cualquier

//if iPhone
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
        [self presentViewController:actionSheet animated:YES completion:nil];
    }
    //if iPad
    else {
        // Change Rect to position Popover
        UIPopoverController *popup = [[UIPopoverController alloc] initWithContentViewController:actionSheet];
        [popup presentPopoverFromRect:CGRectMake(self.view.frame.size.width/2, self.view.frame.size.height/4, 0, 0)inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
    }

Answer 7

prueba este código:

shareMenu.popoverPresentationController.sourceView = self.view
shareMenu.popoverPresentationController.sourceRect = CGRectMake(self.view.bounds.size.width / 2.0, self.view.bounds.size.height / 2.0, 1.0, 1.0)

self.presentViewController(shareMenu, animated: true, completion: nil)