UIActionSheet iOS 8 错误

Question

我正在尝试通过UITableViewCell 上的按钮在 iPad 上显示UIActionSheet。它在 iOS 7 上运行良好，但在 iOS 8 上无法正常运行。UIActionSheet 包含一些视觉伪影，我在控制台中收到此警告：

    Unable to simultaneously satisfy constraints.
        Probably at least one of the constraints in the following list is one you don't want. 
Try this: 
(1) look at each constraint and try to figure out which you don't expect; 
(2) find the code that added the unwanted constraint or constraints and fix it. 
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
    (
        "<NSLayoutConstraint:0x79793de0 H:[UIView:0x797a7630(304)]>",
        "<NSLayoutConstraint:0x7a16ae00 UIView:0x7a16ab60.width == _UIAlertControllerView:0x797a9230.width>",
        "<NSAutoresizingMaskLayoutConstraint:0x7a66f2a0 h=--& v=--& H:[UIView:0x7a16ab60(298)]>",
        "<NSLayoutConstraint:0x797a49e0 _UIAlertControllerView:0x797a9230.width >= UIView:0x797a7630.width>"
    )

    Will attempt to recover by breaking constraint 
    <NSLayoutConstraint:0x79793de0 H:[UIView:0x797a7630(304)]>

    Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
    The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.

我的代码：

- (void)onFavoriteBtn:(id)sender {
    CGPoint btnPosition = [sender convertPoint:CGPointZero toView:_tableView];
    NSIndexPath *indexPath = [_tableView indexPathForRowAtPoint:btnPosition];
    if (indexPath) {
        UIButton *favoriteBtn = (UIButton *)sender;
        CGRect favoriteBtnRect = favoriteBtn.frame;

        UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:nil delegate:nil cancelButtonTitle:@"Cancel" destructiveButtonTitle:@"Remove from Favorites" otherButtonTitles:nil];
        [sheet showFromRect:favoriteBtnRect inView:favoriteBtn.superview animated:true];
    }
}

Answer 1

UIActionSheet 已弃用，因此您可以使用 iOS 8.0 或更高版本中提供的UIAlertViewController。

- (IBAction)onFavoriteBtn:(id)sender {
    CGPoint btnPosition = [sender convertPoint:CGPointZero toView:self.tableView];
    NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:btnPosition];
    if (indexPath) {

        [self showActionSheet:sender];
    }
}

- (void)showActionSheet:(UIView *)sender
{
    NSString *alertTitle = NSLocalizedString(@"ActionTitle", @"Archive or Delete Data");
    NSString *alertMessage = NSLocalizedString(@"ActionMessage", @"Deleted data cannot be undone");

    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:alertTitle
                                                                             message:alertMessage
                                                                      preferredStyle:UIAlertControllerStyleActionSheet];

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

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

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

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

    UIPopoverPresentationController *popover = alertController.popoverPresentationController;
    if (popover)
    {
        popover.sourceView = sender;
        popover.sourceRect = sender.bounds;
        popover.permittedArrowDirections = UIPopoverArrowDirectionAny;
    }

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

Answer 2

看起来您最喜欢的按钮超级视图太小而无法嵌入操作表。尝试使用窗口显示操作表，只是不要忘记转换收藏按钮的坐标：

- (void)onFavoriteBtn:(id)sender {
    CGPoint btnPosition = [sender convertPoint:CGPointZero toView:_tableView];
    NSIndexPath *indexPath = [_tableView indexPathForRowAtPoint:btnPosition];
    if (indexPath) {
        UIButton *favoriteBtn = (UIButton *)sender;
        CGRect frame = [self.window convertRect:favoriteBtn.bounds fromView:favoriteBtn];
        UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:nil delegate:nil cancelButtonTitle:@"Cancel" destructiveButtonTitle:@"Remove from Favorites" otherButtonTitles:nil];
        [sheet showFromRect:frame inView:self.window animated:true];
    }
}