31 uialertsheet ipad uipopovercontroller ios uialertcontroller
我正在使用Xcode 6开发iOS应用程序.
当我使用时UIAlertController,它可以在iPhone 6模拟器上运行良好,但在iPad模拟器上崩溃.
单击"共享"时出现问题,然后可能会崩溃.我该怎么解决？
这是我的代码:
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显示了这条消息:
******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******
Kar*_*tor 40
为了使设备保持独立,请使用它,如下面的代码段所示.此代码将在iPhone /紧凑型设备上为popoverPresentationController返回nil,因此您可以安全地在通用项目中使用它.
if let popoverPresentationController = shareMenu.popoverPresentationController {
popoverPresentationController.sourceView = self.view
popoverPresentationController.sourceRect = sender.bounds
}
self.presentViewController(shareMenu, animated: true, completion: nil)
isa*_*ced 39
试试这段代码:
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)
小智 8
参考： Swift 中 iPad 上的 ActionSheet Popover
创建 popoverController ：
let alertController = UIAlertController(title: nil, message: "Alert message.", preferredStyle: .actionSheet)
self.present(alertController, animated: true, completion: nil)
如果你想用指示器视图显示警报应该：
if let popoverController = alertController.popoverPresentationController {
popoverController.barButtonItem = sender
}
在中心显示警报：
if let popoverController = alertController.popoverPresentationController {
popoverController.sourceView = self.view
popoverController.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)
}
中心无指标：
if let popoverController = alertController.popoverPresentationController {
popoverController.sourceView = self.view
popoverController.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)
popoverController.permittedArrowDirections = []
}
我也面临着同样的问题，终于找到了解决方案。这是我针对Objective-C的解决方案：
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];
斯威夫特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)