在 iOS 8.0 中,Apple 引入了 UIAlertController 来替换 UIActionSheet 。不幸的是,Apple 没有添加任何有关如何呈现它的信息。我在 hayaGeek 的博客上找到了关于它的 entry,但是,它似乎不适用于 iPad。该 View 完全放错了位置:
错位:
正确的:
我使用以下代码在界面上显示它:
let alert = UIAlertController()
// setting buttons
self.presentModalViewController(alert, animated: true)
有没有其他方法可以为 iPad 添加它?或者苹果只是忘记了 iPad,或者还没有实现?
最佳答案
您可以使用 UIAlertController
从弹出窗口显示 UIPopoverPresentationController
。
在 Obj-C 中:
UIViewController *self; // code assumes you're in a view controller
UIButton *button; // the button you want to show the popup sheet from
UIAlertController *alertController;
UIAlertAction *destroyAction;
UIAlertAction *otherAction;
alertController = [UIAlertController alertControllerWithTitle:nil
message:nil
preferredStyle:UIAlertControllerStyleActionSheet];
destroyAction = [UIAlertAction actionWithTitle:@"Remove All Data"
style:UIAlertActionStyleDestructive
handler:^(UIAlertAction *action) {
// do destructive stuff here
}];
otherAction = [UIAlertAction actionWithTitle:@"Blah"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action) {
// do something here
}];
// note: you can control the order buttons are shown, unlike UIActionSheet
[alertController addAction:destroyAction];
[alertController addAction:otherAction];
[alertController setModalPresentationStyle:UIModalPresentationPopover];
UIPopoverPresentationController *popPresenter = [alertController
popoverPresentationController];
popPresenter.sourceView = button;
popPresenter.sourceRect = button.bounds;
[self presentViewController:alertController animated:YES completion:nil];
为 Swift 4.2 进行编辑,虽然有很多相同的博客可用,但它可能会节省您去搜索它们的时间。if let popoverController = yourAlert.popoverPresentationController {
popoverController.sourceView = self.view //to set the source of your alert
popoverController.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0) // you can set this as per your requirement.
popoverController.permittedArrowDirections = [] //to hide the arrow of any particular direction
}
关于ios - 使用 iOS 8 在 iPad 上正确呈现 UIAlertController,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/24224916/