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我在 iOS 7 设备上显示 UIImagePickerController 时遇到问题。我使用以下代码来呈现图像选择器。

UIImagePickerController *cameraUI = [[UIImagePickerController alloc] init];
cameraUI.sourceType = UIImagePickerControllerSourceTypeCamera;
cameraUI.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];
cameraUI.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
cameraUI.delegate = self;

[[self presentViewController:cameraUI animated:YES completion:NULL];

在调用 presentViewController 后，应用程序由于 exec 错误访问而崩溃。控制台报告以下异常。

[SBSAccelerometer valueRestriction]: unrecognized selector sent to instance 0x1650e360
[__NSCFNumber valueRestriction]: unrecognized selector sent to instance 0x146d0e70

我启用了僵尸来查看一个对象是否被过早地释放。Zombies 报告以下异常：

[NSISRestrictedToNonNegativeVariable retain]: message sent to deallocated instance 0x156f0010

有什么想法吗？

编辑

这是我在启用僵尸时收到的堆栈跟踪：

在此处输入图像描述

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1 回答 1

1

这是 iPad 上 iOS 7 中的一个错误。目前的解决方案似乎是在打开 UIPopoverControl 之前请求照片的权限。以下是我实施解决方案的方式：

**// 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。

于 2013-10-25T08:22:53.437 回答