ios - NSInternalInconsistencyException : The specified modal presentation style doesn't have a corresponding presentation controller

Question

更新到 iOS 8.0 SDK 后，我现在在尝试显示 UIImagePickerController 时遇到错误。来自 UITableViewCell :

*** Assertion failure in -[PartsSearchViewController 
_presentViewController:withAnimationController:completion:], 
/SourceCache/UIKit/UIKit-3318.0.1/UIViewController.m:5726

*** Terminating app due to uncaught exception 
'NSInternalInconsistencyException', 
reason: 'The specified modal presentation style doesn't 
have a corresponding presentation controller.'

我的 UITableViewCell “PartCell”声明如下:

@interface PartCell : UITableViewCell <UIImagePickerControllerDelegate>

PartCell 的 presentViewController 上失败了下面的行:

- (IBAction)takeAuditImageClicked:(id)sender {
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = (id)self;
    picker.allowsEditing = YES;
    picker.modalPresentationStyle = UIModalPresentationNone;
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;

    // FAILING ON THE LINE BELOW:
    [[UIViewController topMostController] presentViewController:picker animated:YES completion:NULL];  
}

这是来自 UIViewController 的代码生成单元格的“PartSearchViewController”:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"partCell";
    UINib *nib = [UINib nibWithNibName:@"PartCell" bundle:nil];
    [tableView registerNib:nib forCellReuseIdentifier:CellIdentifier];

    PartCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];// forIndexPath:indexPath];
    if (cell == nil)
    {
        cell = [[PartCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];

    }

    [self fetchedResultsController:[self fetchedResultsControllerForTableView:tableView] configureCell:cell atIndexPath:indexPath];

    return cell;
}

看完 UIViewController和 UIImagePickerController docs，我无法弄清楚代码现在失败的原因是什么。

Answer 1

问题在于

    picker.modalPresentationStyle = UIModalPresentationNone;

注释该行或将演示文稿样式选项更改为任何其他值都不会引发错误。

我猜 8.0 之前的 SDK 只是忽略了这个设置并默认为 UIModalPresentationFullScreen - 但这绝对是一个猜测。如果有人有更好的答案，我会相应地标记它!

来自苹果文档:

UIModalPresentationNone

A nonmodal view presentation or dismissal.

Available in iOS 7.0 and later.

(在 modalPresentationStyle 可用的七种演示样式选项中， UIModalPresentationNone 是唯一一个引发上述错误的选项。)