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)