iOS-iPad上使用UIAlertController的UIAlertControllerStyleActionSheet崩溃

Myth丶恋晨 2023-10-18 22:47 94阅读 0赞

在iPad上使用UIAlertController的UIAlertControllerStyleActionSheet样式弹出相机还是相册选择框时，程序崩溃，信息如下

*** Terminating app due to uncaught exception 'NSGenericException', reason: 'Your application has presented a UIAlertController (<UIAlertController: 0x7fe167894000>) of style UIAlertControllerStyleActionSheet from MainTabBarViewController (<MainTabBarViewController: 0x7fe16709e000>). 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 present the alert controller, you may provide it in the UIPopoverPresentationControllerDelegate method -prepareForPopoverPresentation.'

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L01pbmdnZVFpbmdjaHVu_size_16_color_FFFFFF_t_70][]

意思就是没有设置UIAlertController这个弹出窗口的位置信息，可以通过下面的方式解决

/// iPad上需要设置UIAlertController这个弹出窗口的位置信息（当使用UIAlertController的UIAlertControllerStyleActionSheet时在iPad上运行会崩溃）
                if (isPad) {
                    alertVC.popoverPresentationController.sourceView = self.vMe.table;
                    alertVC.popoverPresentationController.sourceRect = self.view.frame;
                }

或者是通过实现 **UIPopoverPresentationControllerDelegate的prepareForPopoverPresentation方法 来设置UIAlertController在当前页面上的位置信息，设置后的显示效果与 iPhone是有区别的不是在屏幕的中间位置弹出而是在你所设置的位置弹出：如下图的界面效果**

UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:nil
                                                                                 message:nil
                                                                          preferredStyle:UIAlertControllerStyleActionSheet];
                /// iPad上需要设置UIAlertController这个弹出窗口的位置信息（当使用UIAlertController的UIAlertControllerStyleActionSheet时在iPad上运行会崩溃）
                if (isPad) {
                    alertVC.popoverPresentationController.sourceView = self.vMe.table;
                    alertVC.popoverPresentationController.sourceRect = self.view.frame;
                }
                
                /// 取消
                UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:BZLocalizedString(@"common_cancel", nil)
                                                                       style:UIAlertActionStyleCancel
                                                                     handler:^(UIAlertAction * _Nonnull action) {
                                                                     }];
                /// 相册
                UIAlertAction *photoAlbumAction = [UIAlertAction actionWithTitle:BZLocalizedString(@"common_photoAlbum", nil)
                                                                           style:UIAlertActionStyleDefault
                                                                         handler:^(UIAlertAction * _Nonnull action) {
                                                                             [weakSelf showPickerFromPhotoAlbum];
                                                                         }];
                /// 拍照
                UIAlertAction *takingPicturesAction = [UIAlertAction actionWithTitle:BZLocalizedString(@"common_takingPictures", nil)
                                                                               style:UIAlertActionStyleDefault
                                                                             handler:^(UIAlertAction * _Nonnull action) {
                                                                                 [weakSelf showPickerFromCameraSource];
                                                                             }];
                [alertVC addAction:cancelAction];
                [alertVC addAction:takingPicturesAction];
                [alertVC addAction:photoAlbumAction];
                /// 展示
                [weakSelf presentViewController:alertVC animated:YES completion:nil];

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L01pbmdnZVFpbmdjaHVu_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20190802202236433.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L01pbmdnZVFpbmdjaHVu,size_16,color_FFFFFF,t_70