在iPad iOS8环境下打开相册或者拍照

在iPad下打开相册或者拍照，如果使用 UIImagePickerController 打开相册或者拍照，那必须要用到 UIPopoverController 去打开。

UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:picker];
                self.popoverController = popover;
                [self.popoverController presentPopoverFromRect:CGRectMake(0, 0, 600, 800) inView:self.viewController.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

但是在iOS8的iPad环境下，却打不开相册或者拍照，提示如下：

Warning: Attempt to present <UIImagePickerController: 0x7fb3d1167a00>  on <CubeWebViewController: 0x7fb3d324ad20> which is already presenting (null)

解决方法如下：

[[NSOperationQueue mainQueue] addOperationWithBlock:^{
                UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:picker];
                self.popoverController = popover;
                [self.popoverController presentPopoverFromRect:CGRectMake(0, 0, 600, 800) inView:self.viewController.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
            }];

参考：http://stackoverflow.com/questions/24942282/uiimagepickercontroller-not-presenting-in-ios-8

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