在 iOS 8 中更改 Actionsheet 弹出箭头答案

【问题标题】：Change Action sheet popover arrow in iOS8在 iOS 8 中更改 Actionsheet 弹出箭头
【发布时间】：2014-11-10 23:48:06
【问题描述】：

我正在使用 UIAlertController 。但是在装有 iOS 8 的 iPad 上，actionSheet 显示带有弹出箭头。有什么想法可以隐藏那个箭头吗？

这是我的代码：

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"this is alert controller" message:@"yeah" preferredStyle:UIAlertControllerStyleActionSheet];

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

            UIAlertAction *okAction = [UIAlertAction
                                       actionWithTitle:NSLocalizedString(@"OK", @"OK action")
                                       style:UIAlertActionStyleDefault
                                       handler:^(UIAlertAction *action)
                                       {
                                           NSLog(@"OK action");
                                       }];

            UIAlertAction *deleteAction = [UIAlertAction
                                           actionWithTitle:NSLocalizedString(@"Delete", @"Delete action")
                                           style:UIAlertActionStyleDestructive
                                           handler:^(UIAlertAction *action) {
                                               NSLog(@"Delete action");
                                           }];

            [alertController addAction:cancelAction];
            [alertController addAction:okAction];
            [alertController addAction:deleteAction];

            UIPopoverPresentationController *popover = alertController.popoverPresentationController;
            if (popover) {
                popover.sourceView = self.view;
                popover.sourceRect = self.view.bounds;
                popover.permittedArrowDirections = UIPopoverArrowDirectionUnknown;
            }
            [self presentViewController:alertController animated:YES completion:nil];

【问题讨论】：

stackoverflow.com/questions/4755786/…
使用 [alertControllerActionSheet.popoverPresentationController setPermittedArrowDirections:0];

标签： ipad ios8 uipopovercontroller uiactionsheet uialertcontroller

【解决方案1】：

解决方案：
use below line for remove arrow from action sheet

[yourAlertController.popoverPresentationController setPermittedArrowDirections:0];

示例

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Test Action Sheet" message:@"Message" preferredStyle:UIAlertControllerStyleActionSheet];

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

    UIAlertAction *okAction = [UIAlertAction
                               actionWithTitle:@"Ok"
                               style:UIAlertActionStyleDefault
                               handler:^(UIAlertAction *action)
                               {
                                   NSLog(@"OK action");
                               }];
    UIAlertAction *otherAction = [UIAlertAction
                               actionWithTitle:@"Other"
                               style:UIAlertActionStyleDefault
                               handler:^(UIAlertAction *action)
                               {
                                   NSLog(@"Otheraction");
                               }];

    [alertController addAction:okAction];
    [alertController addAction:otherAction];
    [alertController addAction:cancelAction];


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

    //For set action sheet to middle of view.
    alertController.popoverPresentationController.sourceView = self.view;
    alertController.popoverPresentationController.sourceRect = self.view.bounds;

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

输出

【讨论】：

rect.orign.x = ... 和 .y == ... 不是必需的。

【解决方案2】：

Jageen 在 Swift 中的回答：

popoverController.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)

【讨论】：

【解决方案3】：

如果您有导航/状态栏，则所选答案不会使警报居中。使您的警报控制器准确居中：

alertController.popoverPresentationController.sourceRect = [self sourceRectForCenteredAlertController];
alertController.popoverPresentationController.sourceView = self.view;
alertController.popoverPresentationController.permittedArrowDirections = 0;

使用方便的方法：

- (CGRect)sourceRectForCenteredAlertController
{
    CGRect sourceRect = CGRectZero;
    sourceRect.origin.x = CGRectGetMidX(self.view.bounds)-self.view.frame.origin.x/2.0;
    sourceRect.origin.y = CGRectGetMidY(self.view.bounds)-self.view.frame.origin.y/2.0;
    return sourceRect;
}

此外，如果视图旋转，警报控制器不会保持居中。要使警报控制器居中，您需要在旋转后更新 sourceRect 。例如：

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    // Check if your alert controller is still being presented
    if (alertController.presentingViewController) {
        alertController.popoverPresentationController.sourceRect = [self sourceRectForCenteredAlertController];
    }
}

或者，如果您不想使用旋转事件，可以使用popoverPresentationController 委托方法重新定位弹出框：

- (void)popoverPresentationController:(UIPopoverPresentationController *)popoverPresentationController willRepositionPopoverToRect:(inout CGRect *)rect inView:(inout UIView *__autoreleasing  _Nonnull *)view
{ 
    // Re-center with new rect
}

【讨论】：

【解决方案4】：

使用 UIPopoverPresentationController 显示警报时您走错了路。你只是不需要那段代码......

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"this is alert controller" message:@"yeah" preferredStyle:UIAlertControllerStyleActionSheet];

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

        UIAlertAction *okAction = [UIAlertAction
                                   actionWithTitle:NSLocalizedString(@"OK", @"OK action")
                                   style:UIAlertActionStyleDefault
                                   handler:^(UIAlertAction *action)
                                   {
                                       NSLog(@"OK action");
                                   }];

        UIAlertAction *deleteAction = [UIAlertAction
                                       actionWithTitle:NSLocalizedString(@"Delete", @"Delete action")
                                       style:UIAlertActionStyleDestructive
                                       handler:^(UIAlertAction *action) {
                                           NSLog(@"Delete action");
                                       }];

        [alertController addAction:cancelAction];
        [alertController addAction:okAction];
        [alertController addAction:deleteAction];

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

【讨论】：