UIImagePickerController 仅在 iOS 7 上崩溃 - iPad [英] UIImagePickerController crash only on iOS 7 - iPad

问题描述

自从人们开始升级到 iOS 7 以来，我的一个实时应用程序发生了数百次崩溃.有其他人看到过这个问题吗?在装有 iOS 7 的 iPad 3 上没有任何内容......

I'm getting hundreds of crashes from one of my live apps ever since people started upgrading to iOS 7. Has anyone else seen this problem? Nothing reproduces on my iPad 3 with iOS 7...

Crashlytics 链接:crashes.to/s/edf2e71d9a5

Link to Crashlytics: crashes.to/s/edf2e71d9a5

Fatal Exception CALayerInvalidGeometry
CALayer position contains NaN: [nan nan]
0 ...    CoreFoundation  __exceptionPreprocess + 130
2    CoreFoundation  -[NSException initWithCoder:]
3    QuartzCore      CA::Layer::set_position(CA::Vec2<double> const&, bool) + 242
4    QuartzCore  -[CALayer setPosition:] + 54
5    QuartzCore  -[CALayer setFrame:] + 594
6    UIKit   -[UIView(Geometry) setFrame:] + 254
7    UIKit   -[UILabel setFrame:] + 138
8    UIKit   -[UINavigationItemView initWithNavigationItem:] + 384
9    UIKit   -[UINavigationItem _titleView] + 92
10   UIKit   -[UINavigationBar _prepareForPushAnimationWithItems:] + 68
11   UIKit   -[UINavigationBar pushNavigationItem:] + 292
12   UIKit   -[UINavigationBar _pushNavigationItem:transition:] + 386
13   UIKit   __71-[UINavigationController pushViewController:transition:forceImmediate:]_block_invoke + 150
14   UIKit   -[UINavigationController pushViewController:transition:forceImmediate:] + 1384
15   UIKit   -[UINavigationController pushViewController:animated:] + 294
16   UIKit   -[UIImagePickerController _setupControllersForCurrentSourceType] + 112
17   UIKit   -[UIImagePickerController setSourceType:] + 456
18 ...   libdispatch.dylib   _dispatch_call_block_and_release + 10
19   libdispatch.dylib   _dispatch_client_callout + 22
20   libdispatch.dylib   _dispatch_main_queue_callback_4CF$VARIANT$mp + 268
21   CoreFoundation  __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8
22   CoreFoundation  __CFRunLoopRun + 1300
23   CoreFoundation  CFRunLoopRunSpecific + 522
24   CoreFoundation  CFRunLoopRunInMode + 106
25   GraphicsServices    GSEventRunModal + 138
26   UIKit   UIApplicationMain + 1136

推荐答案

总的来说，我们得出的结论是，这是 iPad 上 iOS 7 中的一个错误.当您第一次尝试从 UIBarButtonItem 在 UIPopoverControl 中显示 UIImagePickerController 时会发生这种情况.在用户授予他们相册的权限后，崩溃发生.目前的解决方案似乎是在打开 UIPopoverControl 之前请求照片权限.以下是我如何实施我的解决方案:

Collectively we've come to the conclusion that this is a bug in iOS 7 on iPad. It occurs when you attempt to show a UIImagePickerController in a UIPopoverControl from a UIBarButtonItem for the first time. After the user grants permission to their photo album the crash happens. It appears the solution for now is to request permission to photos before opening the UIPopoverControl. Here is how I implemented my solution:

// Photo Library
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])
{
    void(^blk)() =  ^() {
        UIImagePickerController* picker = [[UIImagePickerController alloc] init];
        picker.delegate = self;
        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        if (NIIsPad()) {
            UIPopoverController* popover = [[UIPopoverController alloc] initWithContentViewController:picker];
            [popover presentPopoverFromBarButtonItem:self.popoverAnchor permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
        } else {
            [self.navigationController presentModalViewController:picker animated:YES];
        }
    };

    // Make sure we have permission, otherwise request it first
    ALAssetsLibrary* assetsLibrary = [[ALAssetsLibrary alloc] init];
    ALAuthorizationStatus authStatus;
    if (IOS_VERSION_GREATER_THAN_OR_EQUAL_TO(@"6.0"))
        authStatus = [ALAssetsLibrary authorizationStatus];
    else
        authStatus = ALAuthorizationStatusAuthorized;

    if (authStatus == ALAuthorizationStatusAuthorized) {
        blk();
    } else if (authStatus == ALAuthorizationStatusDenied || authStatus == ALAuthorizationStatusRestricted) {
        [[UIAlertView alertViewWithTitle:@"Grant photos permission" message:@"Grant permission to your photos. Go to Settings App > Privacy > Photos."] show];
    } else if (authStatus == ALAuthorizationStatusNotDetermined) {
        [assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
            // Catch the final iteration, ignore the rest
            if (group == nil)
                dispatch_async(dispatch_get_main_queue(), ^{
                    blk();
                });
            *stop = YES;
        } failureBlock:^(NSError *error) {
            // failure :(
            dispatch_async(dispatch_get_main_queue(), ^{
                [[UIAlertView alertViewWithTitle:@"Grant photos permission" message:@"Grant permission to your photos. Go to Settings App > Privacy > Photos."] show];
            });
        }];
    }
}

不要忘记将 AssetsLibrary.framework 添加到您的项目中.

Don't forget to add AssetsLibrary.framework to your project.

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