iOS-UIAlertController在Pad上使用UIAlertControllerStyleActionSheet模式崩溃问题

刺骨的言语ヽ痛彻心扉 2023-10-18 22:54 63阅读 0赞

因为Pad上的UIAlertController在UIAlertControllerStyleActionSheet模式时与手机端不同，Pad不会从底部弹出，而是需要在给定的视图位置弹出。

所以需要做一个配置：

1.定义一个View

@property (strong,nonatomic) UIView *showSaveSheetView;

2.实现控件的设定

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"保存到相册" message:nil preferredStyle:UIAlertControllerStyleActionSheet];
    UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * action) {}];
    UIAlertAction* saveAction = [UIAlertAction actionWithTitle:@"保存" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * action) {
        UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(imageSavedToPhotosAlbum: didFinishSavingWithError: contextInfo:), nil);
            }];
    [alert addAction:cancelAction];
    [alert addAction:saveAction];
            
    [self presentViewController:alert animated:true completion:nil];

3.只需要在其后加入下段代码即可

UIPopoverPresentationController *popover = alert.popoverPresentationController;
    if (popover) {
     
        UIWindow *window = [UIApplication sharedApplication].keyWindow;
        if (!self.showSaveSheetView) {
            self.showSaveSheetView = [[UIView alloc] init];
            [window addSubview:self.showSaveSheetView];
        }
        self.showSaveSheetView.center = window.center;
        popover.sourceView = self.showSaveSheetView;
        popover.sourceRect = self.showSaveSheetView.bounds;
        popover.permittedArrowDirections = UIPopoverArrowDirectionAny;
    }

记得在弹框消失的方法中销毁视图

- (void)dismiss {
        [self.showSaveSheetView removeFromSuperview];
        self.showSaveSheetView = nil;
    }